MECKLENBURG COUNTY
Land Use & Environmental Services Agency
Code Enforcement
July 11, 2012
Electrical, Mechanical, and Plumbing Consistency Teams
Schedule Changed for Contractor Attendees
Consistency meetings will not be held during the months of August and September because of the Department’s
commitment to staff the DNC. In the future, Electrical, Mechanical and Plumbing Consistency Meetings for
contractor attendees will be held in the months of March, June, September, and November on the days and at
the times designated below.
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Note this is a change from the current practice of addressing contractor issues on a monthly basis. Because MEP
contractor consistency issues have been very limited in the last year, we are switching to a strategy of focusing on
contractor consistency issues once a quarter (March, June, September and November as noted above). As now,
contractors may submit consistency issues at anytime to Code Administrators for discussion in meetings, but MEP
issues will be discussed and resolved quarterly, as noted below:
The next Electrical Contractor Consistency meeting will be held on Wednesday, 11-16-12.
The next Mechanical Contractor Consistency meeting will be held on Tuesday, 11-27-12.
The next Plumbing Contractor Consistency meeting will be held on Wednesday, 11-28-12.
Building Consistency meetings remain unchanged. Please make note of this and adjust your
schedules/calendars accordingly.
Commercial Code Enforcement is accomplished through the combined efforts of the Plan Review and Field
Inspection staff. Each plays an important role in assuring that structures are built in compliance with the State
and local laws. It is very important that the enforcement is administered in a fair, thorough, and consistent
manner by all. The purpose of the Consistency Policy is to improve the Department's ability to accomplish the
above and "SPEAK WITH ONE VOICE." Currently, monthly consistency meetings are held as outlined in
the following schedule:
TRADES CONSISTENCY MEETING SCHEDULE
Building:
Electrical:
Mechanical:
Plumbing:
The 1st Wednesday of every month from 8:00 - 9:00 a.m.
The 2nd Wednesday of designated months from 8:00 - 10:00 a.m.
The last Tuesday of designated months from 8:00 - 9:00 a.m.
The last Wednesday of designated months from 8:00 - 9:00 a.m.
As always, if you have consistency issues or questions that require a code interpretation or should be discussed
in the Consistency Team meetings, please email the information to Willis Horton (Mechanical/Plumbing Code
Administrator) willis.horton@mecklenburgcountync.gov, or Joe Weathers (Electrical Code Administrator)
joseph.weathers@mecklenburgcountync.gov.
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Memo
Date:
To:
From:
June 1, 2012
All Residential Plan Review Customers
James N. Bartl, AIA, Director of Code Enforcement
Re:
Current status of Residential Plan Review
On May 7 we distributed a memo advising all customers of our status in the Residential Drawing Submittal
(RDS) program. This memo provides a further update, regarding where we are on RDS as of today.
1. Current review turnaround time status
As of this morning (Friday, June 1), our status in each category is:
• 81 paper plans (custom or other), the longest 8 days out.
• 69 e- plans (primarily master plans), the longest 19 days out.
• 4 townhouse projects, the longest 13 days out.
2. Added staff plan review resources
• We are in the final stages of filling two part time plan review positions; those two resources start June 13
and will focus strictly on e-plan review.
• All hourly RDS plan reviewers are working overtime. In addition, we continue to receive overtime help
reviewing paper plans from four field inspectors.
We are also surveying selected home builders regarding their RDS anticipated volume over the next 30-6090 days, as well as the nature of it (paper vs. E-plan), and their possible use of alternate strategies (see item
4). We hope to turn this into a rough estimate (June through September) of industry demand on RDS, which
we will compare to our total available plan review resources, both full and part time.
3. Considering screening drawings before submittal
The Department has noted a marked increase in E-plan submittals containing a high level of incorrect or
incomplete information. Plan review management has talked to two local builders about this. However, if
this problem persists, we will likely add a gatekeeping or coordinator temporary position to screen drawings
to assure they are ready for review.
• The fact that we have never considered this in the 14 year history of RDS is a strong statement regarding
the extensive nature of this problem, as seen through the eyes of both line staff and RDS management.
4. Alternate permitting strategies we will offer customers
After further discussion regarding other possible ways to address this problem, we developed two alternate
permitting strategies, which we are prepared to offer customers concerned, with regard to RDS plan review
and permitting turnaround times.
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Alternate A; home builders always have the option of submitting a single house plan, rather than an entire
master plan, either electronically or in paper.
• It merits noting that the paper process is more flexible than E-Plan-NC in supporting “approved as
noted” (AAN) submittals, more often leading to a permit ready set (through AAN) on cycle 1.
• The average 1st cycle approval rate of paper plans is 76% versus 5% for e-plans.
Alternate B; this one is a tougher interim strategy, and while not ideal, we think it could be an effective
option for some home builders. It would work as follows;
• We would complete the 1st cycle master plan review, with all red marks held inside E-Plan-NC.
• We would accept bulletin drawings from NC Professional Engineers to address any structural issues.
• The home builders would print out two sets of the cycle 1 red mark master plan set, and we would treat
these plans as a custom paper plan, for permit issuance on a specified site or street address only.
• This would allow the master plan cycle 2 submittal to move forward separately, gaining corrections and
approved status.
• At the same time, the affected site or street address would also gain a permit and move into construction.
5. Other expedited review tools available
Customers should remember they also have the Residential Professional Certification Program available
which leads to approval of plans on the submittal day or next day, for projects using qualified designers.
• A description of Residential Professional Certification Program is located at;
http://www.charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Inspections/trades/building/
ResidentialBuilding/Documents/Residential%20Professional%20Certification%20Program.pdf
6. Mecklenburg’s reciprocal review program with Raleigh
While Raleigh only does master plan reviews for projects under permit application, I remind customers that
Mecklenburg and Raleigh have a reciprocal agreement for residential master plans reviewed electronically in
the program website, www.E-Plan-NC.org. Consequently, if a home builder has a master plan already
approved by the City of Raleigh in E-Plan-NC, under our reciprocal agreement, we will accept permit
applications using that master plan number (i.e.; there is no need for re-review of that master plan set).
7. Update on third party review contract availability
We offered this to one 3rd party contractor who turned it down. We are reaching out to other possible plan
review vendor streams, however as of today we have no residential 3rd party plan review agreement in place.
Even considering the impact of the additional plan review resources (noted in item 2) on our current work
load, we anticipate it will take an extended period of time (perhaps 60-90 days) to move RDS review times
back to the five work day turnaround goal. Know that we are focused and working diligently on mitigating
the problem. We appreciate your patience as we work to get RDS plan review turnaround times back in line.
• Questions on the above may be directed to Tim Taylor, Manager of RTAC-CTAC,
at 704-336-3835, or tim.taylor@mecklenburgcountync.gov
Added note on another future alternate; in the past the Department began master plan reviews only when an
actual permit is submitted. In the future, we will announce a home builder option in which we will perform
the master plan review in advance of a permit application, provided the cost of the plan review is secured per
a method specified by the Department. This advance payment for plan review would be credited back to the
home builder on the first permits issued under that master plan number. While this does not contribute an
immediate solution to our current RDS challenges, long term it will help prevent future problems.
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4/11/12 ELECTRICAL CONSISTENCY MEETING
Code Consistency Questions
1. Consistency question- Switch with fuses over top of a transformer. Is this a violation of
110-26?
Yes, 110.26(A) 3 states:
(3) Height of Working Space. The work space shall be clear and extend from the grade, floor,
or platform to the height required by 110.26(E). Within the height requirements of this
section, other equipment that is associated with the electrical installation and is located above
or below the electrical equipment shall be permitted to extend not more than 150 mm (6 in.)
beyond the front of the electrical equipment.
2. The local sheet metal shop fabricates pull and junction boxes as well as wireways for us.
Can we use a non-listed J-box, wireway or auxiliary gutter for equipment grounding? Are
wireways listed for grounding?
No, A wireway is a raceway (see Article 100 for definition) and there are specific construction
specifications for their construction in Article 376, however 250.118(13) & (14) specifically
require that these would have to be listed for grounding.
376.100 Construction.
(A) Electrical and Mechanical Continuity. Wireways shall be constructed and installed so that
adequate electrical and mechanical continuity of the complete system is secured.
(B) Substantial Construction. Wireways shall be of substantial construction and shall provide a
complete enclosure for the contained conductors. All surfaces, both interior and exterior, shall
be suitably protected from corrosion. Corner joints shall be made tight, and where the
assembly is held together by rivets, bolts, or screws, such fasteners shall be spaced not more
than 300 mm (12 in.) apart.
(C) Smooth Rounded Edges. Suitable bushings, shields, or fittings having smooth, rounded
edges shall be provided where conductors pass between wireways, through partitions, around
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bends, between wireways and cabinets or junction boxes, and at other locations where
necessary to prevent abrasion of the insulation of the conductors.
(D) Covers. Covers shall be securely fastened to the wireway.
3. A 1½ HP swimming pool pump motor is installed as part of a swimming pool installation at
a residence. The pump is 240-volt, single-phase rated and protected by a 25 amp rated
circuit breaker which calculates to be 250-percent of the motor FLA which is normal with
430.52(C)(1) and Table 430.52. Question -Does this pool pump require GFCI protection be
installed for personnel protection?
The full load current for a 240 volt, single phase pool pump motor is 10 amps at 230 volts
with the maximum rating or setting of motor branch circuit short circuit and ground fault
protective device (inverse time circuit breaker) at 250% could be rated at 25 amps. The GFCI
protection requirement only applies to outlets supplying pool pump motors connected to single
phase, 120 through 240 volts branch circuits rated at 15 or 20 amperes based on 680.21(C)
but not at 25 amperes so the answer is no.
680.21 Motors, (A) Wiring Methods. The wiring to a pool motor shall comply with (A)(1)
unless modified for specific circumstances by (A)(2), (A)(3), (A)(4), or (A)(5). (C) GFCI
Protection. Outlets supplying pool pump motors connected to single-phase, 120 volt through
240 volt branch circuits, rated 15 or 20 amperes, whether by receptacle or by direct
connection, shall be provided with ground fault circuit-interrupter protection for personnel.
Using the Code definition of the term outlet is important to correctly apply this requirement.
The term outlet includes a point on the wiring system where a receptacle is installed to supply
a cord-and plug-connected pool pump motor and also includes a point on the wiring system
from where the branch circuit is run directly to the pool pump motor often referred to as a
“hard-wired” installation.
4. What NEC Section covers underwater installations? A property owner has a large pond
with an island that he wishes to run a feeder to. 2) Is it acceptable to lay nonmetallic
conduit on the bottom of the pond? 3) If so how do we secure it? 4) Could UF or USE cable
be used without a raceway?
1) See new 2005 NEC Article 682 where the scope reads, “This article applies to the
installation of electrical wiring for, and equipment in and adjacent to, natural or artificially
made bodies of water not covered by other articles in this Code, such as but not limited to
aeration ponds, fish farm ponds, storm retention basins, treatment ponds, irrigation
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(channels) facilities.” 2) Maybe, but check with manufacturer, as water “should not damage”
but submersion is not a listed “uses permitted” in Article 352 for rigid nonmetallic raceways
such as Schedule 40 or Schedule 80 PVC. First, see the definition of “wet location” in Article
100, which states, “Installations under ground or in concrete slabs or masonry in direct
contact with the earth; in locations subject to saturation with water or other liquids, such as
vehicle washing areas; and in unprotected locations exposed to weather.” Note “submersion”
is not addresses as a “wet location” per the use of the NEC.
See Article 352, Part II.
Installation and more specifically 352.10 Uses Permitted, which states, “The use of RNC shall
be permitted in accordance with 352.10(A) through (H), plus look at the FPN, which states,
“Extreme cold may cause some nonmetallic conduits to become brittle and therefore more
susceptible to damage from physical contact.” Under 352.10(D) Wet Locations, it states, “RNC
shall be permitted in portions of dairies, laundries, canneries, or other wet locations and in
locations where walls are frequently washed, the entire conduit system including boxes and
fittings used therewith shall be installed and equipped so as to prevent water from entering
the conduit. All supports, bolts, straps, screws, and so forth, shall be of corrosion-resistant
materials or be protected against corrosion by approved corrosion-resistant materials.” Note it
states nothing about “submersion” nor is there permission to submersion in extreme cold
water where ice may be a substantial issue. Also see 352.12(C), Uses Not Permitted, that
states, “(C) Physical Damage. Where subject to physical damage unless identified for such
use.” Also, note that Section 310.8(C) that addresses conductors for general wiring in wet
locations does not address submersion.
3) See 352.30 Securing and Supporting, which
states, “RNC shall be installed as a complete system as provided in 300.18 and shall be
fastened so that movement from thermal expansion or contraction is permitted. RNC shall be
securely fastened and supported in accordance with 352.30(A) and (B).” Section 330.30(A)
states, “RNC shall be securely fastened within 900 mm (3 ft) of each outlet box, junction box,
device box, conduit body, or other conduit termination. Conduit listed for securing at other
than 900 mm (3 ft) shall be permitted to be installed in accordance with the listing.” Section
330.30(B) states, “RNC shall be supported as required in Table 352.30(B). Conduit listed for
support at spacings other than as shown in Table 352.30(B) shall be permitted to be installed
in accordance with the listing. Table 352.30(B) Support of Rigid Nonmetallic Conduit (RNC)
states”
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Conduit Size
Metric Designator
16–27
35–53
63–78
91–12
155
Maximum Spacing
Between Supports
Trade Size
½–1
1¼–2
2½–3
3½–5
6
mm or m
ft
900 mm
1.5 m
1.8 m
2.1 m
2.5 m
3
5
6
7
8
4) See “340.10 Uses Permitted for UF cable, which states, “Type UF cable shall be
permitted as follows: (1) For use underground, including direct burial in the earth. For
underground requirements, see 300.5. Therefore, submersion is not addressed as a
permissible use nor is it prohibited. (3) For wiring in wet, dry, or corrosive locations
under the recognized wiring methods of this Code. Also, per 338, Service-Entrance
Cable: Type SE and USE, submersion is not addressed as a permissible use nor is it
prohibited. Therefore, an installer should contact the manufacturer of the cable for
advise on using either product as a submersible wiring method. Also, it should be
noted that the FPN stating, “The “Uses Permitted” is not an all-inclusive list.” Was not
included in either Article 340 or 338 for Type UF cable or Type SE or USE cable
respectively. However, there are listed cables and cable assemblies for “submersion”
and there is no prohibition for using a Rigid Nonmetallic Conduit such as Schedule 40
or Schedule 80 PVC as a protective sleeve for this type of cable or cable assembly.
5. Is an isolated equipment-grounding conductor required to be connected to boxes,
wireways, etc where the isolated equipment-grounding conductor passes through such boxes
and enclosures as the exception to 250.148 that references 250.146(D) only references
panelboards?
This question points out a revision to 250.146(D) by adding a new last sentence that states, “
Where installed in accordance with the provisions of this new section, the equipment
grounding conductor shall also be permitted to pass through boxes, wireways, or other
enclosures without being connected to such enclosures. Also, note that the former second
word, “required”, to this section has been replaced with the word, “installed”, as the NEC does
not require isolated grounding receptacles with such installed receptacles being a design issue.
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6. Are replacement receptacles required to be “Tamper Resistant”?
No, See 406.3(D)
7. Per 110.26(C)(3), if an entrance to a work space has a door(s) it is required that the
door(s) opens in the direction of egress and be equipped with locking devices that open
under simple pressure. Would this requirement apply to multiple doors in line with an egress
path and where does this requirement stop – at an exit corridor, at the front door to the
building, etc?
This question points out a revision to 110.26(C)(2) that states, “Where equipment rated 1200
A or more that contains overcurrent devices, switching devices, or control devices is installed
and there is a personnel door(s) intended for entrance to and egress from the working space
less than 7.6 m (25 ft) from the nearest edge of the working space, the door(s) shall open in
the direction of egress and be equipped with panic bars, pressure plates, or other devices that
are normally latched but open under simple pressure.” Also, note that this provision has been
moved into a section of it its own so that it is understood this requirement is a stand alone
requirement and not depend on or a part of other requirements.
8. 1) Can a grounding electrode conductor to a concrete-encased electrode be smaller than 4
AWG copper. 2) If yes, is physical protection required, and 3) if yes, what type of physical
protection is required?
1) Yes, the grounding electrode conductor from a concrete encased electrode to a service can
be as small as a No. 8 copper but does not have to be larger than No. 4 based on 250.66(A)
and the accompanying Table 250.66 2) Section 250.64(B) provides protection requirements
for grounding electrode conductors as follows: “A 6 AWG grounding electrode conductor that
is free from exposure to physical damage shall be permitted to be run along the surface of the
building construction without metal covering or protection where it is securely fastened to the
construction; otherwise, it shall be in rigid metal conduit, intermediate metal conduit, rigid
nonmetallic conduit, electrical metallic tubing, or cable armor.” 3) Grounding electrode
conductors smaller than 6 AWG shall be in rigid metal conduit, intermediate metal conduit,
rigid nonmetallic conduit, electrical metallic tubing, or cable armor.
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9. 1) What is a branch-circuit overcurrent device, and 2) is it different from a feeder-circuit
overcurrent device?
1) 2008 NEC, Article 100 has a new definition: “A device capable of providing protection for
services, feeder, and branch circuits and equipment over the full range of overcurrents
between its rated current and its interrupting rating.” 2) No, it is not different.
10. 525.11 states that where multiple services or other power systems or both supply loads
at a carnival or fair where the loads (rides, buildings, structures, etc) are separated less than
12-feet shall be bonded to the same grounding electrode system. Where do you find the
requirements for minimum size of the bonding conductor and the type metallic material that
is acceptable as the required bonding conductor?
See revised 525.11 for the 2008 NEC that states, “Where multiple services or separately
derived systems, or both, supply portable structures, the equipment grounding conductors of
all the sources of supply that serve such structures separated by less than 3.7 m (12 ft) shall
be bonded together at the portable structures. The bonding conductor shall be copper and
sized in accordance with table 250.122 based on the largest overcurrent device supplying the
portable structures, but not smaller than 6 AWG.”
11. What
is the electrical classification of an unventilated pit in a jiffy lube?
511.2 Definitions.
Major Repair Garage. A building or portions of a building where major repairs, such as engine
overhauls, painting, body and fender work, and repairs that require draining of the motor
vehicle fuel tank are performed on motor vehicles, including associated floor space used for
offices, parking, or showrooms. [30A:3.3.12.1]
Minor Repair Garage. A building or portions of a building used for lubrication, inspection, and
minor automotive maintenance work, such as engine tune-ups, replacement of parts, fluid
changes (e.g., oil, antifreeze, transmission fluid, brake fluid, air-conditioning refrigerants),
brake system repairs, tire rotation, and similar routine maintenance work, including associated
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floor space used for offices, parking, or showrooms. [30A:3.3.12.2]
511.3 Area Classification, General.
Where Class I liquids or gaseous fuels are stored, handled, or transferred, electrical wiring and
electrical utilization equipment shall be designed in accordance with the requirements for Class
I, Division 1 or 2 hazardous (classified) locations as classified in accordance with 500.5 and
500.6, and this article. A Class I location shall not extend beyond an unpierced wall, roof, or
other solid partition that has no openings. [30A:8.3.5, 8.3.2]
(A) Parking Garages. Parking garages used for parking or storage shall be permitted to be
unclassified.
FPN: For further information, see NFPA 88A-2007, Standard for Parking Structures, and NFPA
30A-2008, Code for Motor Fuel Dispensing Facilities and Repair Garages.
(B) Repair Garages, With Dispensing. Major and minor repair garages that dispense motor
fuels into the fuel tanks of vehicles, including flammable liquids having a flash point below
38°C (100°F) such as gasoline, or gaseous fuels such as natural gas, hydrogen, or LPG, shall
have the dispensing functions and components classified in accordance with Table 514.3(B)(1)
in addition to any classification required by this section. Where Class I liquids, other than
fuels, are dispensed, the area within 900 mm (3 ft) of any fill or dispensing point, extending in
all directions, shall be a Class I, Division 2 location.
(C) Major Repair Garages. Where flammable liquids having a flash point below 38°C (100°F)
such as gasoline, or gaseous fuels such as natural gas, hydrogen, or LPG, will not be
dispensed, but repair activities that involve the transfer of such fluids or gases are performed,
the classification rules in (1), (2), and (3) shall apply.
(1) Floor Areas.
(a)
Ventilation Provided. The floor area shall be unclassified where there is mechanical
ventilation providing a minimum of four air changes per hour or one cubic foot per minute of
exchanged air for each square foot of floor area. Ventilation shall provide for air exchange
across the entire floor area, and exhaust air shall be taken at a point within 0.3 m (12 in.) of
the floor.
(b)
Ventilation Not Provided. The entire floor area up to a level of 450 mm (18 in.) above
the floor shall be classified as Class I, Division 2 if the ventilation does not comply with
511.3(C)(1)(a).
(2) Ceiling Areas. Where lighter-than-air gaseous fueled vehicles, such as vehicles fueled by
natural gas or hydrogen, are repaired or stored, the area within 450 mm (18 in.) of the ceiling
shall be considered for classification in accordance with (a) and (b).
(a)
Ventilation Provided. The ceiling area shall be unclassified where ventilation is
provided, from a point not less than 450 mm (18 in.) from the highest point in the ceiling, to
exhaust the ceiling area at a rate of not less than 0.3 m3/min/m2 (1 cfm/ft2) of ceiling area at
all times that the building is occupied or when vehicles using lighter-than-air gaseous fuels are
parked below this area.
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(b)
Ventilation Not Provided. Ceiling areas that are not ventilated in accordance with
511.3(C)(2)(a) shall be classified as Class I, Division 2.
(3) Pit Areas in Lubrication or Service Room. Any pit, belowgrade work area, or subfloor work
area shall be classified as provided in (a) or (b).
(a)
Ventilation Provided. The pit area shall be a Class I, Division 2 location where there is
mechanical ventilation providing a minimum of six air changes per hour.
(b)
Ventilation Not Provided. Where ventilation is not provided in accordance with
511.3(C)(3)(a), any pit or depression below floor level shall be a Class I, Division 1 location
that extends up to the floor level.
(D) Minor Repair Garages. Where flammable liquids having a flash point below 38°C (100°F)
such as gasoline, or gaseous fuels such as natural gas or hydrogen, will not be dispensed or
transferred, the classification rules in (D)(1), (D)(2), and (D)(3) shall apply to the lubrication
and service rooms.
(1) Floor Areas. Floor areas in minor repair garages without pits, belowgrade work areas, or
subfloor work areas shall be unclassified. Where floor areas include pits, belowgrade work
areas, or subfloor work areas in lubrication or service rooms, the classification rules in (a) or
(b) shall apply.
(a)
Ventilation Provided. The entire floor area shall be unclassified where there is
mechanical ventilation providing a minimum of four air changes per hour or one cubic foot per
minute of exchanged air for each square foot of floor area. Ventilation shall provide for air
exchange across the entire floor area, and exhaust air shall be taken at a point within 0.3 m
(12 in.) of the floor.
(b)
Ventilation Not Provided. The floor area up to a level of 450 mm (18 in.) above any
unventilated pit, belowgrade work area, or subfloor work area and extending a distance of 900
mm (3 ft) horizontally from the edge of any such pit, belowgrade work area, or subfloor work
area, shall be classified as Class I, Division 2.
(2) Ceiling Areas. Where lighter-than-air gaseous fuels (such as natural gas or hydrogen) will
not be transferred, such locations shall be unclassified.
(3) Pit Areas in Lubrication or Service Room. Any pit, belowgrade work area, or subfloor work
area shall be classified as provided in (a) or (b).
(a)
Ventilation Provided. Where ventilation is provided to exhaust the pit area at a rate of
not less than 0.3 m3/min/m2 (1 cfm/ft2) of floor area at all times that the building is
occupied, or when vehicles are parked in or over this area and where exhaust air is taken from
a point within 300 mm (12 in.) of the floor of the pit, belowgrade work area, or subfloor work
area, the pit shall be unclassified. [30A:7.4.5.4. Table 8.3.1]
(b)
Ventilation Not Provided. Where ventilation is not provided in accordance with
511.3(D)(3)(a), any pit or depression below floor level shall be a Class I, Division 2 location
that extends up to the floor level.
(E) Modifications to Classification.
(1) Specific Areas Adjacent to Classified Locations. Areas adjacent to classified locations in
which flammable vapors are not likely to be released, such as stock rooms, switchboard
rooms, and other similar locations, shall be unclassified where mechanically ventilated at a
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rate of four or more air changes per hour, or designed with positive air pressure, or where
effectively cut off by walls or partitions.
(2) Alcohol-Based Windshield Washer Fluid. The area used for storage, handling, or dispensing
into motor vehicles of alcohol-based windshield washer fluid in repair garages shall be
unclassified unless otherwise classified by a provision of 511.3. [30A:8.3.5, Exception]
12. 240.83(D) indicates that "SWD" marked circuit breakers are for switching fluorescent
lighting and that “HID” marked circuit breakers are for switching fluorescent and highintensity discharge lighting. Two Questions: 1) Are circuit breakers marked "SWD" suitable
for switching incandescent as well as fluorescent lighting? 2) Are circuit breakers marked
“HID” suitable for switching incandescent as well as fluorescent and high intensity discharge
lighting?
See 240.83(D) and 110.3(B). Yes. The NEC does not prohibit or restrict the use of a circuit
breaker to switch incandescent lighting loads. Circuit breakers marked “SWD” can be used for
switching both incandescent and fluorescent lighting loads. There are no limitations on this
application in the UL guide card information (DIVQ) for molded case circuit breakers. 2) See
240.83(D) and 110.3(B). Yes. Circuit breakers marked “HID” can be used for switching highintensity discharge lighting loads, fluorescent lighting loads and incandescent lighting loads.
SWD and HID breakers are subjected to additional endurance and temperature testing to
ensure that they will be robust enough for regular switching of these types of loads.
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5/9/12 ELECTRICAL CONSISTENCY MEETING
1. I am building a new electrical service on a house with lightning protection already
installed. Adjacent to the electrical meter, there are two ground rods, six feet apart for
the lightning protection. My I utilized these rods to ground my service?
No, See 250.60 Use of Air Terminals.
Air terminal conductors and driven pipes, rods, or plate electrodes used for grounding air
terminals shall not be used in lieu of the grounding electrodes required by 250.50 for
grounding wiring systems and equipment. This provision shall not prohibit the required
bonding together of grounding electrodes of different systems.
2. I recently installed a new service panel and had to relocate it five feet from its
original location. The old panel had a dryer circuit run with 8-2 w/ground
aluminum Type SE cable. I extended the circuit using 6-2 w/ground Type NM-B
copper cable. The inspector said I have to continue the run with Type SE cable
or use a 4-wire Type NM-B cable so I get an insulated neutral. He said Type SE
cable is the only cable permitted without an insulated neutral. I know new
circuits require insulated neutrals and that there are requirements to maintain
the use of 3-wire with bare neutral but never heard of this nor interpreted it in
this fashion. Can you explain this?
250.140 Frames of Ranges and Clothes Dryers.
Frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes
dryers, and outlet or junction boxes that are part of the circuit for these appliances shall be
connected to the equipment grounding conductor in the manner specified by 250.134 or
250.138.
Exception: For existing branch-circuit installations only where an equipment grounding
conductor is not present in the outlet or junction box, the frames of electric ranges, wallmounted ovens, counter-mounted cooking units, clothes dryers, and outlet or junction boxes
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that are part of the circuit for these appliances shall be permitted to be connected to the
grounded circuit conductor if all the following conditions are met.
(1)
(2)
The supply circuit is 120/240-volt, single-phase, 3-wire;
or 208Y/120-volt derived from a 3-phase, 4-wire, wye-connected system.
copper or 8 AWG aluminum.
The grounded conductor is not smaller than 10 AWG
(3)
The grounded conductor is insulated, or the grounded
conductor is uninsulated and part of a Type SE service-entrance cable and the branch
circuit originates at the service equipment.
(4)
Grounding contacts of receptacles furnished as part of
the equipment are bonded to the equipment.
3. Is it permissible to remove the outer jacket of a listed cable and then install and use those
conductors in a metal raceway?
No. The conductors in a listed cable are to be used in accordance with its listing and labeling
instructions. See NEC 110.3(B)
4. Is it permissible to sleeve a cable with non-metallic flex in a residential mechanical closet
that has an air handler with a non-ducted return (closet space serves as the return plenum)?
SECTION 602
PLENUMS
602.1 General. Supply, return, exhaust, relief and ventilation air plenums shall be limited to
uninhabited crawl spaces, areas above a ceiling or below the floor, attic spaces and
mechanical equipment rooms. Plenums shall be limited to one fire area.
Fuel-fired appliances shall not be installed within a plenum.
602.2 Construction. Plenum enclosures shall be constructed of materials permitted for the
type of construction classification of the building. The use of gypsum boards to form plenums
shall be limited to systems where the air temperatures do not exceed 125ºF
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(52ºC) and the building and mechanical system design conditions are such that the gypsum
board surface temperature will be maintained above the airstream dew-point temperature. Air
plenums formed by gypsum boards shall not be incorporated in air-handling systems utilizing
evaporative coolers.
602.2.1 Materials within plenums. Except as required by Sections 602.2.1.1 through
602.2.1.6, materials within plenums shall be noncombustible or shall have a flame spread
index of not more than 25 and a smoke-developed index of not more than 50 when tested in
accordance with ASTM E 84 or UL 723.
Exceptions:
1. Rigid and flexible ducts and connectors shall conform to Section 603.
2. Duct coverings, linings, tape and connectors shall conform to Sections 603 and 604.
3. This section shall not apply to materials exposed within plenums in one- and two-family
dwellings.
4. This section shall not apply to smoke detectors.
5. Combustible materials fully enclosed within continuous noncombustible raceways or
enclosures, approved gypsum board assemblies or within materials listed and labeled for such
application.
6. This section shall not apply to materials exposed within equipment rooms and furnace
rooms in dwelling units.
602.2.1.1 Wiring. Combustible electrical or electronic wiring methods and materials, optical
fiber cable, and optical fiber raceway exposed within a plenum shall havea peak optical
density not greater than 0.50, an average optical density not greater than 0.15, and a flame
spread not greater than 5 feet (1524 mm) when tested in accordance with NFPA 262. Only
type OFNP (plenum rated nonconductive optical fiber cable) shall be installed in plenum-rated
optical fiber raceways. Wiring, cable, and raceways addressed in this section shall be listed
and labeled as plenum rated and shall be installed in accordance with NFPA 70
5. I was recently turned down by an inspector for having open splices on a 12 volt under
counter lighting system. The inspector stated that this was because the transformer was not
a class 2 transformer. Is she correct?
The inspector is correct. See NEC 725.46
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6. I am installing low voltage cables in a dropped ceiling. I am using J-hooks to support the
cable bundle. Are the J-hook drops required to be secured at the top and bottom, or can they
just be suspended from the top?
See NEC 300.11. If it is from a structural support, then No. If it is strictly a wire support then
yes it needs support at both top and bottom.
7. Is a disconnect required within sight of a sign or can the breaker in the panel represent
the disconnect?
Yes. See NEC 600.6(A) 1 and 2.
8. Is it permissible to install a junction box that is unsupported (example: at a cooktop
location)?
No. See NEC 300.11(A)
9. In a residence we have a sub-panel being fed with a feeder from the main panel. The
water line coming into the house is plastic then turns to copper after the meter. There are no
copper water lines in contact with the earth for more than 3.0 m (10 ft) Is it acceptable to
bond the copper water line in the residence from the feeder panel since we are only bonding
the copper lines and not grounding?
Section 250.52(A)(1) deals with the metal underground water pipe as a grounding electrode
issue. Since the water pipe is plastic, it is not covered by this section.
Section 250.104 (A)(1) requires Metal water piping system(s) installed in or attached to a
building or structure to be bonded to the service equipment enclosure, the grounded
conductor at the service, the grounding electrode conductor where of sufficient size, or to the
one or more grounding electrodes used. (Single family dwelling) In a building of multiple
occupancy, the water pipe is permitted to be bonded to the panelboard that serves only that
particular occupancy. (Section 250.104(A)(2)
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10. All of the electric ranges I am installing in an apartment building are rated 17.0 KW at
240-volts. My boss says I can use 50-ampere range cords and I say they are over 70amperes and shall be direct-wired. Who is correct?
Note 1 Table 220.55, Table 310.16, 220.61, Table 250.122, 250.138(A)
Your Boss is Correct. Note 1 to Table 220.55 requires that for ranges
individually rated more than 12 KW but not more than 27 KW, the maximum
demand in Column C shall be increased 5 percent for each additional kilowatt or
major fraction thereof by which the rating of individual ranges exceeds 12 KW.
17KW -12 KW = 5 KW
5 KW x 5% = 25% x 8 KW
(Column C) = 2 KW
8 KW + 2 KW = 10 KW
10 KW ÷ 240 V = 41.7 A
Based on this your branch circuit rating can be 50-amperes, the branch circuit ungrounded
conductors would be 8 AWG copper conductors (Table 310.16) and the grounded conductor
can be 10 AWG (Section 220.55). You need an equipment grounding conductor run with the
branch circuit conductors and it will be sized according to Table 250.122 which indicates for a
50-ampere rated overcurrent device a 10 AWG copper conductor is required or if you are
using a metal raceway, the metal raceway can be the equipment grounding conductor.
You will be required to use a 50-ampere, 125/250V, 4-wire flexible cord and matching
receptacle to comply with the grounding of the cord and plug connected equipment
requirements of Section 250.138(A).
11. I installed a UL listed bathroom fan unit that has an equipment grounding conductor
screw termination on it that I attached to. The inspector turned me down and said I had to
add a ground clip and terminate the grounding conductor to it. Why?
There are many different makes and models of bath fan on the market. It will depend entirely
on how the fan is made and the manufacturer’s installation instructions as to how the
equipment ground should be terminated.
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6/13/11 ELECTRICAL CONSISTENCY MEETING
1. An inspector has required that I not use “hurricane clips”, unless I can prove that that clip
is UL listed for Exactly the specific combination of the particular grid, and particular fixture.
When I have asked sales people, or reps for help with this, they tell me he is out in left field!
My understanding is that the clips must be listed, for instance, for use with medium duty
grid, and lights having a lip over so much width, etc. Who is right? If the inspector is, where
can I find this information?
Yes, the inspector is correct. If a listed clip is used it must be identified for the ceiling type and
fixture type.
Ref. 410-36(b). UL clarified that the types may be included on the clip carton i.e. 2X4 lay-in
fixtures on a medium duty grid.
2. What is the difference between hospital grade receptacles and other receptacles?
A Hospital Grade receptacle is intended for hospital use in other than hazardous locations in
accordance with Article 517 of the NEC. Hospital grade receptacles must comply with
additional construction and testing requirements that are designed to confirm that they will
maintain the integrity of the equipment grounding path when subjected to impacts, abrupt
removals of mated attachment plugs, and other electrical and mechanical stresses that it is
likely to see in hospital installations. Receptacles including Hospital grade types are Listed
under the category Receptacles for Attachment Plugs and Plugs (RTRT) located on page 349
in the White Book. Hospital grade receptacles are identified by the marking “Hospital Only” or
the marking “Hospital Grade” and a green dot on face of the receptacle.
3. Article 517 defines a wet location, in a patient care area as normally subject to wet
conditions. These may include standing fluids on the floor or drenching of the work area.
Who defines if the area will have standing fluids or drenching, such as in an OR room?
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The authority having jurisdiction in this case would probably be the hospital administrator. The
engineer for the project should define the area, in consultation with the hospital, and with the
agreement of the AHJ. OR Rooms are normally scrubbed down and washed, but are not
considered wet locations.
4. Is the disconnecting means required in Article 225 also required to have overcurrent
protection as part of the assembly?
No. See NEC 225.31, 225.36, 225.38
5. A generator is determined to be separately derived. Where should the grounding
electrode conductor be connected? At the generator, transfer switch or
disconnecting\overcurrent device for the generator? Should the grounding electrode
conductor be sized per NEC 250-66 or 250-122?
The connection may be made at any point from the generator to the first overcurrent device.
It probably could not be done at the transfer switch, since it probably would not contain
overcurrent devices. The grounding electrode conductor would be sized according to Article
250-66. See NEC 250-20(d), 250-30(a)(1), 250-30(a)(2)
6. Is wiring to equipment in attics and crawl spaces “Subject to Physical Damage”? What
guidelines are used to decide if wiring to a furnace or other equipment needs to be protected
from physical damage?
See NEC 320.23 and 300.4. Also see Interpretations Book “Cables in Accessible Attics” , page
2.8 for attics and 334.15(C) for crawl spaces. NOTE NEC Administrative Code.
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7. When can SEU or Romex be used between a disconnect and a piece of equipment instead
of protecting the wire with flex.
In all cases when it’s installed where not subject to physical damage and for romex also not a
wet location
8. Can I install floor boxes in the garage at my house?
Yes, it’s not a wise installation, but there is no code section that prohibits floor boxes in
residential garages.
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Building Consistency Meeting
Commercial
Date 04/04/2012 Recorder and minutes prepared by Danny Wooten/Lon McSwain
Staff present: On File
Public present:
Topics/Subject
Decisions/Conclusions/Actions
Old
Business
None
New
Business
Section 403.5.3 These sections allow for the locking of stairway door from the stair side
& 403.5.3.1
in high rise buildings when certain requirements are met. Note that in
section 403.5.3.1 the two way communication is not to go to the
command center but to a 24 hr. manned central station.
Section
This section allows for doors in buildings that are not high rise to be
1008.1.9.10
locked from the stair side under exceptions 2 and 3.
Panic
Hardware
On floors of mixed occupancies if an assembly space has less than 100
occupants then panic hardware is only required on doors from that
space. If the occupant load is greater than 100 then panic hardware is
required on all egress doors between that space and the exit discharge.
Section 502.4.7 This section calls for vestibules on entrance door to a space or building.
Energy Code
This would not apply to door that are for egress only.
Aluminum
Aluminum is a limited combustible material but is allowed In Type I
and Type II construction.
.
Approved By ___Lon McSwain_________ Date _______04/27/2012
Building Consistency Meeting
Commercial
Date 05/02/2012 Recorder and minutes prepared by Danny Wooten/Vikki Stokes
Staff present: On File
Public present: John Mecks (Appleblossom); Mark Wattles (Gorilla Construction);
Heather Gavagan (Smith Harris Design);
Topics/Subject
Decisions/Conclusions/Actions
Old
Business
None
New
Business
Section1104.4
Exception 1
Section 1007.8
Occupant Load
Table 1004.1.1
Section
1405.13.2 Fall
Protection
If a building has an aggregate floor area above or below the level of exit
discharge including mezzanines more than 3000 sq. ft. an accessibly
route is required to be provided to those stories.
Two-way communications are not required at the elevator if two-way
communications are provided at the areas of refuge on the floors served
by the elevator or another accessible means of egress is provided such
as a ramp.
Occupant load is based on the use function of a space not on the
occupancy. See attached.
In R occupancies window openings that are located more than 72”
above finished grade and less than 24” above finished floor shall be
provided with hardware that will restrict the opening to less than 4”.
Occupant Load vs Separation of Mixed Uses for Accessory “Assembly” Spaces
Q: How is the occupant load calculated for assembly spaces that are accessory to other
uses?
A: The occupant load of any room or space is calculated using the figures in Table
1004.1 based on the function of the particular room or space in question. There has been
some confusion surrounding this because of code sections 303 Assembly Group A and
508.2 Accessory Occupancies. Both of these sections have to do with the separation of
uses, not occupant loads.
Example:
An 8,000 sf tenant space on the 4th floor of a 4 story Type IIA unsprinklered building is
being upfit to house offices and work space for a local business. Included in the floor
plan are 3 conference rooms outfitted with tables and chairs. Each conference room
measures approximately 250 sq ft. There is also a reception lobby measuring 150 sq ft in
which the plan shows 12 fixed seats. The kitchenette break room for employees is 8’ x
12’ or 96 sq ft. The balance of the floor area (7004 sf) is office / work space.
Questions:
1. What is the occupant load of this tenant space?
2. Are separations required between the “assembly” & Business spaces?
1. Occupant load:
Conference rooms
Reception lobby
250 sf x 3 = 750 sf
750 sf ÷ 15 =
12 fixed seats =
50 people*
12 people
Break Room
Office / Work area
96 sf ÷ 100 =
7004 sf ÷ 100 =
1 person**
70 people
Total Occupant Load 133 people
*no panic hardware needed since each room has less than 50 occupants
** based on local interpretation for break room of 100 sf or less
2. Separations:
No separations are required between the “assembly” areas and the Business portion in
this example.
Section 508.2.1 Area Limitations – since each individual “assembly” space is less than
750sf, they are not counted towards the 10% area limitation but are considered part of the
occupancy of the main use.
Section 508.2.2 Occupancy Classification – refers to 302.1 for classification (see
following)
Section 303.1 Assembly Group A - exception #2 applies because the reception lobby and
each conference room has less than 50 people. Exception #3 also applies because the
reception lobby and each conference room has less than 750 sf. Note: the break room (<
100 sf) is not considered assembly space based on local interpretation.
Approved by Lon McSwain
4/26/12
Occupancy use first, then decide if there is any accessory occupancy, then do
occupant load.
Approved By ___Lon McSwain_________ Date _______05/30/2012
Building Consistency Meeting
Residential
Date 04/04/2012 Recorder and minutes prepared by: Danny Wooten/Lon McSwain/Jeff Griffin
Staff present: On File
Public present: Daniel McBride (Cunnare Group) ; David Reynolds (BFS) ;
Matthew Klapheke (L&M Costruction) ;Jennifer Smith, ( Pultegroup) ;
Kelly Strickland (The Colville Co.);Charlie Sofinowski, Ryan Meeuwsen
(M/I Homes);Jerry Anderson, (Ryan Homes); Wayne Carter ( W B Carter
Contracting); Alan McGee, Doc McGee (McGee Brothers) ; Brian Hall
(Classic Homes); Mark ( Gorilla Construction); Banks Pickens (Shea
Homes); Jeff Gerdes (Live Well); John Tammao (Simonini); Marcel
Papingau, Damon Howard (Howard Verna Engineering)
Old
Business
None
New
Business
Weep Holes
Note in section R703.7 spacing of weep holes has changed from 48” to 33”
oc.
Safety Glazing
R308.4
Glazing adjacent to a stairway or landing within 36” horizontally of a
walking surface when the glazing is less than 60” above the walking
surface or glazing adjacent to stairways within 60” horizontally of the
bottom tread of a stairway in any direction and is less than 60” above
the nose of the tread is required to be safety glazing. This is a new
requirement and will require tempered on side walls of stairways and
closer around landings. Illustration below shows shaded area that is
considered a hazardous location:
60”
High
Efficiency
Bulbs
In new construction75% of the light fixtures must be supplied with
high efficiency light bulbs for final inspection.
Mechanical
Requirements
See the 2012 residential section of the Mechanical Code for new
requirements for kitchen hoods and ventilation of habitable spaces,
must vent to exterior and have a damper.
Section
R303.1
Exception 2
Foundation
Straps
Handrails
When a habitable room has no exterior source of light and no installed
light fixture the contractor must provide information on how the
minimum required lighting level is to be supplied.
Installation of straps to tie the sill plate to the foundation must be
installed per the requirements of the manufacturer.
The height of handrails has changed it is now 34” to 38”.
Fireplace
Inspections
Building inspectors will inspect all wood burning fireplaces this includes
inserts and their flues, only gas fireplaces will be inspected by
Mechanical inspectors.
Approved By ___Lon McSwain_________ Date _____04/27/2012__
Building Consistency Meeting
Residential
Date: 6/6/12 Recorder and minutes prepared by: Danny Wooten/Jeff Griffin/Lon
McSwain
Staff present: On file.
Public present: Greg Sloan (Ryland Homes); Ryan Meevwsen/Charles Sofinowski
(MI Homes); Mike Winn/Jonathan Hess (Ryan Homes); Chris Carroll (Meeting
Street); Brian Hall (Classic Homes); James Nelson (Shea Homes); Steven Brusko
(Landis Reed Homes); Daniel McBride (Cunnane Group); Jeff Gerdes (Livewell);
Dave Reynolds (Bldrs 1st Source); Jerry Andersen (Ryan); Kelly Strickland (The
Colville Group); Keur Adkins (Regent Homes); John Tammao (Alan Simonini
Homes); Matthew Klapheke (L&M Homes); Marcel Papineau; Darren Pride;
Jackson (Classic Homes);
Topics/Subject
Decisions/Conclusions/Actions
Old
Business
None
New
Business
Average of
Fenestration
Glazing
Windows In a
New Addition
Section N1102.3.2, see attached explanation.
Wall Bracing
When a second story addition is made to a residence the first floor wall
bracing must be brought up to code with engineering documentation. If
an addition is made to a residence care should be taken that the existing
is not compromised and that the wall bracing is still within code
compliance.
New load tables are being established for southern yellow pine. The
load table for 2X4 lumber has been adopted by SPIB which will affect
the truss manufactures but will not be a code requirement until 2015.
When the floor framing is perpendicular to the rated wall heavy timber
construction may be used at the band to meet the 1 hr. fire rating.
Wood Products
Exterior Rated
Wall
Construction
Distance to
Property Line.
Windows in an addition must meet the current code. Old windows from
the existing house cannot be used unless they can meet the 15%
exception allowed by Section N1102.3.3
This is measured from the property line to the face of the finished wall,
(includes siding or cladding material such as vinyl siding, hardboard,
fiber-cement and brick veneer, etc…).
Townhouse
You cannot use 2 independent 1 hr rated walls to meet the exception for
Separation
sprinklers. You must use common 2 hour rated walls between
Section 302.2.5 townhouses. There is a code change proposal in the works and will
monitor for BCC approval.
Wall Bracing
It is acceptable to use gypsum wall board as wall bracing for interior
walls.
Fenestration calculation example
Approved By ___Lon McSwain_________ Date _____07/09/2012__
Building Consistency Meeting
Residential
Date: 5/2/12 Recorder and minutes prepared by: Danny Wooten/Jeff Griffin
Staff present: On file.
Public present: Greg Sloan (Ryland Homes); Kenny Childers (Cornerstone Bldrs);
Adam Kuhn (Advanced Framing); Curt Curtis (True Homes); Brent Turell (Pulte
Homes); Ryan Meevwsen (MI Homes); Mike Winn/Jonathan Hess (NVR, Inc); Bill
Green (Barefoot and Company); John Mecks(Apple blossom Insulators); Chris
Carroll (Place Crafters, LLC); Brian Hall (Classic Homes); James Nelson (Shea
Homes); Darrell Fries (Standard Pacific Homes); Steven Brusko (Landis Reed
Homes); Daniel McBride (Cunnane Group); Jeff Gerdes (Livewell); Dave Reynolds
(Bldrs 1st Source); Marc Austin (Ryland Homes); Jerry Andersen (Ryan); Bank
Perkins (Shea Homes); David R. Schwieman (DR Schwieman, Inc); David Tyson
(David Tyson & Assoc. Inc.); Mark Wattler; Ken Smith/Rod Spence (Banister
Homes); Allen Terwilliger (Lennar Homes).
Topics/Subject
Decisions/Conclusions/Actions
Old
Business
None
New
Business
2012 Code
Book
Discussed the layout of the new book which includes other codes
towards the back that are abridge from mechanical, plumbing, fuel/gas
& electrical. Because the other codes were inserted in the abridge
format you might find 2-3 of the same chapter #’s like there might be 3
chapter 3’s through the book but they apply to different codes like a
chapter 3 for building, chapter 3 for mechanical and a chapter 3 for
plumbing. Recommend tabbing books to prevent getting into the wrong
code section when looking up chapters. Also discussed that there are
several errata’s in the first printing of the book and DOI now has posted
on their website information on printing errors that you should
download and mark your code book if it’s the first printing future
printings will have corrected information in them, site location is listed
below:
http://www.ncdoi.com/OSFM/Engineering/BCC/Documents/Errata/NC
ResidentialCode.pdf
CO detectors
Language in the printed 2012 code book is in error due to the retraction
of the approved CO requirements by the rules review committee at the
State level. The NC legislature had already approved in the general
statutes requirements for the CO detectors and in so doing modification
to that language is not possible however the inclusion of that language
can be placed in the NC building codes. The best information we
currently have on what should be required is as indicated below:
R315.1 Carbon monoxide alarms. In new construction, one-and twofamily dwellings and townhouses within which fuel-fired appliances or
fireplaces are installed or that have attached garage shall be provided
with an approved carbon monoxide alarm installed outside each
separate sleeping area in the immediate vicinity of the bedroom (s) as
directed by the alarm manufacturer.
R315.2 Where required-existing dwellings. In existing dwellings, where
interior alterations, repairs, or additions requiring a building permit
occur, or where one or more sleeping rooms are added or created, or
where fuel-fired appliances or fireplaces or garages are added or
replaced or exist, carbon monoxide alarms shall be provided in
accordance with Section R315.1.
Exception: Work involving the exterior surfaces of dwellings, such as
the replacement of roofing or siding, or the addition or replacement of
windows or doors, or the addition of a porch or deck, or the installation
of a fuel-fire appliance that cannot introduce carbon monoxide to the
interior of the dwelling, are exempt from the requirements of this
section.
R315.3 Alarm requirements. The required carbon monoxide alarms
shall be audible in all bedrooms over background noise levels with all
intervening doors closed. Single station carbon monoxide alarms shall
be listed as complying with UL2034 and shall be installed in
accordance with this code and the manufacturer’s installation
instructions. Battery powered, plug-in, or hard-wired alarms are
acceptable for use.
Fire separation
distance R302
A General layout of the current requirements of the 2012 code related
to fire separation distances including when soffit protection and/or
rating is required was produced and sent out, a copy of which is
attached to the minutes. This information will be posted on our website
under publications.
Wall Bracing
There are significant changes to the 2012 code in dealing with wall
bracing, this has been discussed and in order to make sure that a
structure meets one of the methods new information will be required on
set of plans sent in for plan review, general sample was given out and is
attached to the minutes for review. Information that clearly notes the
bracing method, location and proposed wall lines is required for
residential plans going through plan review.
Chapter 11
fenestration
exemption
Question was asked if the 15 square foot fenestration exemption was
still allowed, currently this is in section N1102.3.2. A specific product
that was a block picture unit used for garden tub areas was present for
discussion. This glass block fenestration product meets the maximum
square footage and would be approved. This exemption applies to the
entire house and all windows and door openings.
Designing new
builders
certificate
Closed attic
option for
Cellulose and
fiberglass
2012 Code
Update class
Builders sample certificate found in appendix E dealing with the energy
code requirements has be reformatted and is loaded on our website for
review and usage, this is a word document so that fields can have
information insert in the appropriate sections specific to the builders
home.
There is some new language in the code that allows under certain
conditions for a sealed attic or rafter cavity and the use of either
fiberglass or cellulose if installed correctly. Details of this option were
reviewed as listed below:
The Charlotte HBA is sponsoring a class to be taught on June 11th at
CPCC on the 2012 code see the attached link for further information:
https://mail.mecklenburgcountync.gov/exchweb/bin/redir.asp?URL=htt
p://www.hbacharlotte.com/event_display.cfm?eid=321
Builders sample certificate, please complete
appropriate sections and can print any legible
size. Certificate must be posted on site for final
inspection (please remove this note).
ENERGY EFFICIENCY CERTIFICATE
N1101.9
(Certificate is required to be posted on electrical panel box, kitchen
cabinet, attic with insulation installers certificate or other approve
location)
Builder, Permit Holder or Registered Design
Professional
Print Name:
Signature:
Property Address:
Date:
Insulation Rating-List the value covering
largest area to all that apply (as
applicable)
RVALUE
CEILING/ROOF
WALL
FLOOR
CLOSED CRAWL SPACE WALL
SLAB
BASEMENT WALL
FENESTRATION:
RRRRR-N/A
R-
U-FACTOR
SOLAR HEAT GAIN COEFFICIENT (SHGC)
BUILDING AIR LEAKAGE
U-0.35
U-0.35
___ VISUALLY
INSPECTED ACCORDING TO N1102.4.2.1 or
___ BLOWER DOOR TEST ACCORDING TO N1102.4.2.2
ACH50 [Target: 5.0] or CFM50/SFSA [Target: 3.0]
NAME AND ADDRESS OF TESTING COMPANY/INDIVIDUAL:
DATE:
DUCTS:
PHONE: (
)
-
DUCT INSULATION-UNCONDITIONED AREAS
DUCT INSULATION –SEMI-CONDITIONED AREAS
TOTAL DUCT LEAKAGE TEST RESULT
(SECTION N1103.2.2)
R-8
R-4
(CFM25 TOTAL/100SF) [TARGET: 6]
NAME AND ADDRESS OF DUCT TESTING COMPANY/INDIVIDUAL:
DATE:
PHONE: (
)
-
CERTIFICATE TO BE PERMANENTLY DISPLAYED
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Land Use and Environmental Service Agency
(Code Enforcement)
CHAPTER 3 GENERAL REGULATIONS
1.) (Q) A plumbing contractor wants to change out a gas storage type water heater for a new
tankless gas fired water heater. The current installation has a B vent which extends
through several floors. The building is more than 6 stories high. The previous use of
the building was mercantile but has been changed to office. The B vent currently goes
through a new drop ceiling that was added in the past. The added ceilings make access
virtually impossible to run either the PVC or the Stainless Steel vent recommended by
the manufacturer. Does the contractor have any options to install the tankless water
heater?
(A) No. Because of the corrosive atmosphere in the piping using a B vent for the tankless
water heater is not an option. If it is indeed impossible to run the Stainless Steel or
the plastic pipe then another storage type water heater must be installed if the
contractor wants to utilize the B vent system currently installed. Ref: 301.3 FGC
2) (Q) An inspector is called to inspect a gas fired appliance installed in a fire pit on the patio
of a residential home. Only parts of the listed appliance are installed in the fire pit. The
contractor has dissembled the appliance which voided the listing. The inspector
turned the job down. The contractor called the department to see if the appliance
could be approved as installed.
(A) The decision was made that the installation could be approved as installed if the
contractor could get a letter from the manufactures engineer stating the installation of
the product was approved per contractors installation. The letter was received by the
inspector and the job was approved. Ref: 301.4, 105(FG) (Discussion 2012 MC, 301.4
Exception 2)
CHAPTER 4 GAS PIPING INSTALLATIONS
1) (Q) Copper pipe has been installed underground from an LP storage tank to a tankless
water heater located on the exterior wall of a residence. The piping is buried 24 inches
deep. Are there any other special requirements for this installation?
(A) Yes. An approved dielectric fitting shall be installed above ground outside the building.
The fitting serves to electrically isolate the underground piping. Ref: 404.8 FGC 2012
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(Code Enforcement)
2) (Q) Does the Fuel Gas Code specify a minimum length for sediment trap piping?
(A) No. 2012 and 2009 Code has no specification for the length of the nipple. Our previous
interpretation has been “a minimum or 3 inches long or per the equipment
manufacturer’s installation instructions.” Ref: 408.4 FGC 2012
3) (Q) Are sediment traps required at every change of direction of metallic gas piping?
(A) No. This requirement is not in the code. If required by the manufacturers installation
instructions it would be required. Ref: 405.1, 408.4 FGC 2012.
4) (Q) Are all the provisions approved for use in the Q & A for the 2006 code still valid under
the 2012 Code? See list below.
410.2 MP regulators. MP pressure regulators shall comply with the following:
1. The MP regulator shall be approved and shall be suitable for the inlet and outlet gas
pressures for the application.
2. The MP regulator shall maintain a reduced outlet pressure under lockup (no-flow)
conditions.
3. The capacity of the MP regulator, determined by published ratings of its
manufacturer, shall be adequate to supply the appliances served.
4. The MP pressure regulator shall be provided with access. Where located indoors,
the regulator shall be vented to the outdoors or shall be equipped with a leak-limiting
device, in either case complying with 410.3.
5. A tee fitting with one opening capped or plugged shall be installed between the MP
regulator and its upstream shutoff valve. Such tee fitting shall be positioned to allow
connection of a pressure measuring instrument and to serve as a sediment trap.
6. A tee fitting with one opening capped or plugged shall be installed not less than 10
pipe diameters downstream of the MP regulator outlet. Such tee fitting shall be
positioned to allow connection of a pressure measuring instrument.
(A) Numbers one through five are the same. Number six has been revised to eliminate the
requirement for a tee fitting. Ref: 410.2 #6 FGC 2012
5) (Q) While inspecting a gas piping installation the inspector finds the vented pressure
regulators have vent piping located on a manifold with breather vents from other
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devices. Would the 2012 code allow the vent piping to be on a manifold with multiple
devices?
(A) No. Ref: 410.3.1 2012 FGC
6) (Q) Piedmont Natural Gas supplies an OPD at the line service regulator on a 5 # system. Is
an OPD still required at each appliance?
(A) No. Per conversations with PSNC “if the supplier has an OPD device with relief at the
line service regulator, then PSNC would deem it satisfied and preclude the installation
of individual equipment devices having OPD protection.” Ref: 416.1, 416.2 FGC
CHAPTER 5 CHIMNEYS AND VENTS
1) (Q) Is there any change in the 2012 code for the minimum or maximum B vent
height requirements?
(A) No. Minimum code height is 5 feet in 503.6.5. In table 504 minimum height 6 feet and
the maximum height is 100 feet. The exception to the maximum and minimum values
in the code would be the use of the manufacturer’s installation instructions. Ref:
503.6.5, table 504, FGC 2012.
GENERAL REQUIREMENTS (NC Admin. Code/NC Fuel Gas Code, Admin. Section/
Departmental Policy)
1) (Q) A. What are the clearance requirements from the building for a fire pit with gas log
lighter in a single family residence? B. What is the clearance if it is located on the deck?
C. What is the Mechanical or Plumbing inspector responsible to inspect in a fire pit with
a gas log lighter?
(A) If the fire pit is less than 10 feet away from the residence or (B) if it is located on an
attached deck a chimney shall be provided over the pit per the Building Code. (C) If the
fire pit is more than 10 feet away from a residence or attached deck the Mechanical or
the Plumbing inspector is responsible to inspect only the gas line and cut off. They are
not responsible for checking listing and labeling of a decorative appliance. Discussion
with DOI and email from Janie Sutton re-verified by Jim Moeller.
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(Code Enforcement)
2) Announcement: New Water Heater Recall information.
Navien Recalls Tankless Water Heaters Due to Risk of Carbon Monoxide Poisoning
WASHINGTON, D.C. - The U.S. Consumer Product Safety Commission, in cooperation with the
firm named below, today announced a voluntary recall of the following consumer product.
Consumers should stop using recalled products immediately unless otherwise instructed. It is
illegal to resell or attempt to resell a recalled consumer product. Name of Product: Navien
Instantaneous or Tankless Water Heaters Units: About 13,000 Importer: Navien America Inc.,
of Irvine, Calif. Manufacturer: Kyung Dong Navien Co. Ltd., South Korea Hazard: An unstable
connection can cause the water heater's vent collar to separate or detach if pressure is
applied. A detached vent collar poses a risk of carbon monoxide poisoning to the consumer.
Incidents/Injuries: None reported Description: Navien tankless hot water heaters are white
with "T-Creator" and "NAVIEN" on the front. Recalled model numbers are CR-180(A), CR210(A), CR-240(A), CC-180(A), CC-210(A) and CC-240(A) manufactured in 2008. A label on the
side of the water heater lists the model number along with the manufacturing year in YYYY
format. Sold by: Wholesale distributors to in-home installers nationwide from February 2008
through March 2009 for between $1,500 and $2,100. Manufactured in: South Korea Remedy:
Consumers should immediately stop using and check the model and manufacture year
information on their Navien water heater. Consumers with recalled water heaters should
immediately contact Navien to schedule a free repair. Navien will replace all Nylon 66 vent
collar with PVC collars. Consumers who continue use of the water heaters while awaiting
repair, should have a working carbon monoxide alarm installed outside of sleeping areas in
the home.
Customer contact: For additional information, contact Navien at (800) 244-8202 between 8
a.m. and 5 p.m. PT Monday through Friday, or visit the firm's website at
www.navienamerica.com
Note: Regardless of the type of water heater that is used, every home should
have a CO alarm outside all sleeping areas and consumers should ensure that
their CO alarms have working batteries.[cid:image001.jpg@01CCCC92.1C2A7DA0]
3) (Q) Is black CSST gas Piping an approved product per the listing and labeling
requirements of the Fuel Gas Code? Is it approved per ICC-ES testing
requirements to be used without a separate ground?
(A) Even though the answer to both of the questions above is yes the current position
of the Electrical CA for Mecklenburg County and the Electrical Chief for DOI is
as of March 30th 2012 the product is not approved without a separate grounding
conductor.
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(Code Enforcement)
4) (Q) A contractor is changing out an existing furnace in a residence. The new furnace is a
a high efficiency type with a PVC vent that is piped to the outside of the building. The
water heater has an existing 3 inch single wall vent that is combined with a 6 inch single
wall vent from the furnace. Should the mechanical inspector allow the mechanical
contractor to simply cap off the single wall vent at the connection of the furnace and
leave the water heater connection as is or should the contractor be required to
run a new 3 inch B vent from the water heater through the roof?
(A) The Mechanical Contractor should re-pipe the water heater with a B vent to meet
current code. Code Section/Discussion FGC_101.4, 102.4, 102.9, 105.4/2012
5) (Q) What type of North Carolina State Contractor License is required to install a heat
exchanger on a heating boiler? On a process boiler?
(A) An H 1 license is required for a heating boiler. A process boiler would require a
special license issued by Mecklenburg County or we would recognize the H 1 State
license. Ref: NC Plb. Heating and Fire Sprinkler Contractor Licensing board rules.
(Code Enforcement)
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CHAPTER 3 GENERAL REGULATIONS
1) (Q) A cooling tower is being erected on the roof of a High Rise building. It is being
assembled using parts that are individually listed. Would this installation be allowed
under the 2012 code?
(A) No. The inspector would not allow the installation to be constructed, however, if the
design is sealed by a professional engineer, registered in the State of North Carolina, the
inspector must accept the design and construction of the equipment. Ref: 301.4,
Exception 2 , 2012 MC
2) (Q) Exhaust Ductwork is installed on the back wall of a garage. It extends out about 4 feet
from the wall into the garage area at an elevation of 6 feet above the floor. How
should the ductwork be protected from vehicle damage per code?
(A) Protection may not be required depending on what types of vehicles are worked on in
the garage, however, reflective tape or a bollard would provide adequate protection.
Ref: 303.4, 2012 MC
3) (Q) A barbeque grill has been installed on the covered porch of a residence. The owner has
constructed the hood himself per NSF requirements. Should the hood be allowed by
the Mechanical Inspector?
(A) NO. The grill is an appliance that is listed for outdoor use. To allow the grill to be under
a covered porch, indoors, per code, the grill would have to have either a type I
commercial hood or a hood built by the manufacturer that is approved and compatible
with the grill. 304.1, 2012 MC
4) (Q) A tractor trailer has a trailer 11 feet 6 inches high. It is backing into a loading dock
inside a public garage. The ceiling of the garage is 20 feet high. What is the minimum
height to the bottom of the unit heater from the top of the trailer if the unit heater is
installed directly over the trailer?
(A) Unless the manufacturers installation instructions specify a greater height the unit
heater shall be at least 1 foot 6 inches from the top of the trailer to the bottom of the
unit heater. Ref: 304.6, 2012 MC
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5) (Q) Can mastic be used in the joints for bonding stacked masonry instead of mortar or
surface bonding cement?
(A) Mastic is required to protect duct joints by adhering to metal duct which is generally
a non porous dry surface when applied. It is not approved for the installation specified
above. 304.1, 304.10.3, 2012 MC
6) (Q) If we are changing out a like for like roof top unit and it is over 16' above grade level
access does it have to have permanent access?
(A) No. 306.5, 2012 MC
7) (Q) I am installing a wood burning stove in my home. When installing the appliance I
will always be able to use table 308.6 for unlisted equipment to reduce clearances.
Is this a true statement?
(A) No. If the solid fuel burning appliance is labeled with clearances those
clearances shall be used when installing the solid-fuel burning appliance. Ref:
308.7, 2012 MC
8) (Q) What improvement in sizing mechanical equipment for single family dwellings and
duplexes has made it possible in the 2012 code to provide equipment that is properly
sized. (So equipment is not under sized nor is it over sized)?
(A) The use of Manual S for sizing requirements. Ref: 312.1, 2012 MC
CHAPTER 4 VENTILATION
1) (Q) To properly balance air flow and have a constant temperature exchange between all
spaces in an occupied building should ventilation be required at a constant value for
building occupants?
(A) NO. Ventilation shall be provided during the periods that a room or space is occupied.
Ref: 401.3, 2012 MC
2) Situation: We are working on a Nail Salon that will be going in a building downtown.
From speaking with the owner they will not be doing acrylic nails, and nearly all their
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products will be organic. In moving forward with the design it has been determined that
per 2012 NCMC (table 403.3 footnote b) we are not allowed to reticulate any air,
therefore, one would think all the air conditioning in the space must be exhausted. This is
not the case per DOI. In conversations with Billy Hinton concerning this section, it is his
interpretation that the reference to, “all air supplied to such spaces” means the
ventilation air supplied, and does not include the air for conditioning the space, therefore,
air for conditioning the space could be returned to the space, but not returned to any
other spaces. Due to the occupancy location on a lower floor of a multi-story building the
designer would like to utilize one of the existing exhaust shafts near the space. One of the
shafts is for toilet exhaust; one shaft is for the pool equipment room. Both exhaust fans
are located on the roof; therefore the shafts are negatively pressurized.
(Q) From reading through Chapter 5 of the code I cannot find any section that will not
allow me to combine the exhaust from the nail salon with either of the existing shafts.
Is this allowed?
(A) Yes. The ventilation requirement for a nail salon, (as determined by 2012 NC
mechanical code and footnote b in table 404.3), would require mechanical exhaust for
the entire amount of ventilation air supplied for the space for the nail stations. The
code would not require all the conditioned air to be exhausted from the space. The
exhaust from the nail stations may be connected to the exhaust for environmental air
since the system is negatively pressurized. Ref: 403.2.1, Table 403.3 foot note b, 2012
MC
3) (Q) We traded emails recently regarding the 2012 code requirement for exhaust in
residential kitchens, such as apartments and condos. The requirement stems from the
footnotes on the ventilation calculation schedule. I was told by another engineer
recently that Mecklenburg County will not require the kitchen exhaust if we are
utilizing natural ventilation for the apartments.
(A) We have not received an interpretation for the table below from DOI at this time.
For Natural verses Mechanical Ventilation we have sent a clarification document to
list conflicts between the two codes.(See charts below for comparisons) 401.2, 2012
MC vs. R303.4, 2012 Residential Building Code.
Date: May 11, 2012
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To:
DOI-David Conner/Dan Dittman
Re:
Differences in the 2012 NC Mechanical code vs. the 2012 NC Residential Code.
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Land Use and Environmental Service Agency
Below is a comparison of the 2 codes (NCRC & NCMC) and the sections related to Natural
ventilation. There is some language in multiple sections that seem to conflict along with the available
commentary that shows some differences as well. Side by side comparison is listed below to
illustrate, question related to application are listed below.
NCRC (Residential)
NCMC (Mechanical)
R303.1 Habitable rooms. All habitable rooms shall have an
401.2 Ventilation required. Every occupied space shall be
aggregate glazing area of not less than 8 percent of the floor
ventilated by natural means in accordance with Section 402 or
area of such rooms. Natural ventilation shall be through
windows, doors, louvers or other approved openings to the
outdoor air. Such openings shall be provided with ready access
or shall otherwise be readily controllable by the building
occupants. The minimum open able area to the outdoors shall
be 4 percent of the floor area being ventilated.
by mechanical means in accordance with Section 403.
Exceptions:
1. The glazed areas need not be open able where the opening is
not required by Section R310 and an approved mechanical
ventilation system capable of producing 0.35 air change per
hour in the room is installed or a whole-house mechanical
ventilation system is installed capable of supplying outdoor
ventilation air of 15 cubic feet per minute (cfm) (78 L/s)
per occupant computed on the basis of two occupants
for the first bedroom and one occupant for each additional
bedroom.
HABITABLE SPACE. A space in a building for living,
sleeping, eating or cooking. Bathrooms, toilet rooms, closets,
halls, storage or utility spaces and similar areas are not
considered habitable spaces.
OCCUPIABLE SPACE. An enclosed space intended for
human activities, excluding those spaces intended primarily
for other purposes, such as storage rooms and equipment
rooms, that are only intended to be occupied occasionally and
for short periods of time.
R303.4.1 Intake opening. Mechanical and gravity outdoor
air intake openings shall be located a minimum of 10 feet
401.4 Intake opening location. Air intake openings shall
(Code Enforcement)
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(3048 mm) from any hazardous or noxious contaminant,
comply with all of the following:
such as vents, chimneys, plumbing vents, streets, alleys,
parking lots and loading docks, except as otherwise specified
in this code. Where a source of contaminant is located within
10 feet (3048 mm) of an intake opening, such opening shall be
located a minimum of 2 feet (610 mm) below the contaminant
source. For the purpose of this section, the exhaust from
dwelling unit toilet rooms, bathrooms and kitchens shall not be
considered as hazardous or noxious.
1. Intake openings shall be located a minimum of 10 feet
(3048 mm) from lot lines or buildings on the same lot.
Where openings front on a street or public way, the distance
shall be measured to the centerline of the street or
public way.
2. Mechanical and gravity outdoor air intake openings shall
be located not less than 10 feet (3048 mm) horizontally
from any hazardous or noxious contaminant source, such
as vents, streets, alleys, parking lots and loading docks,
except as specified in Item 3 or Section 501.2.1.
3. Intake openings shall be located not less than 3 feet (914
mm) below contaminant sources where such sources are
located within 10 feet (3048 mm) of the opening.
R303.5 Outside opening protection. Air exhaust and intake
401.5 Intake opening protection. Air intake openings that
terminate outdoors shall be protected with corrosion-resistant
openings that terminate outdoors shall be protected with
screens, louvers or grilles. Openings in louvers, grilles and
corrosion-resistant screens, louvers or grilles having a
minimum opening size of 1/4 inch (6 mm) and a maximum
opening size of 1/2 inch (13 mm), in any dimension. Openings
shall be protected against local weather conditions. Outdoor air
exhaust and intake openings shall meet the provisions for
exterior wall opening protectives in accordance with this code.
R303.1 Habitable rooms. All habitable rooms shall have an
screens shall be sized in accordance with Table 401.5, and
shall be protected against local weather conditions. Outdoor air
intake openings located in exterior walls shall meet the
provisions for exterior wall opening protectives in accordance
with the International Building Code.
[B] 402.1 Natural ventilation. Natural ventilation of an
occupied space shall be through windows, doors, louvers or
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aggregate glazing area of not less than 8 percent of the floor
area of such rooms. Natural ventilation shall be through
windows, doors, louvers or other approved openings to the
outdoor air. Such openings shall be provided with ready access
or shall otherwise be readily controllable by the building
occupants. The minimum openable area to the outdoors shall
be 4 percent of the floor area being ventilated.
other openings to the outdoors. The operating mechanism for
such openings shall be provided with ready access so that the
openings are readily controllable by the building occupants.
R303.1 Habitable rooms. All habitable rooms shall have an
[B] 402.2 Ventilation area required. The minimum openable
aggregate glazing area of not less than 8 percent of the floor
area to the outdoors shall be 4 percent of the floor area being
area of such rooms. Natural ventilation shall be through
windows, doors, louvers or other approved openings to the
outdoor air. Such openings shall be provided with ready access
or shall otherwise be readily controllable by the building
occupants. The minimum openable area to the outdoors shall
be 4 percent of the floor area being ventilated.
ventilated.
R303.2 Adjoining rooms. For the purpose of determining
[B] 402.3 Adjoining spaces. Where rooms and spaces without
light and ventilation requirements, any room shall be
considered as a portion of an adjoining room when at least
one-half of the area of the common wall is open and
unobstructed and provides an opening of not less than onetenth of the floor area of the interior room but not less than 25
square feet (2.3 m2).
openings to the outdoors are ventilated through an adjoining
room, the opening to the adjoining rooms shall be unobstructed
and shall have an area not less than 8 percent of the floor area
of the interior room or space, but not less than 25 square feet
(2.3 m2). The minimum openable area to the outdoors shall be
based on the total floor area being ventilated.
Exception: Openings required for light and/or ventilation
Exception: Exterior openings required for ventilation shall
shall be permitted to open into a thermally isolated sunroom
or patio cover of not less than one-tenth of the floor area of
be permitted to open into a thermally isolated sunroom
addition or patio cover, provided that the openable area
between the sunroom addition or patio cover and the interior
room has an area of not less than 8 percent of the floor area of
the interior room or space, but not less than 20 square feet
(1.86m2). The minimum openable area to the outdoors shall be
the interior room but not less than 20 square feet (2 m2). The
based on the total floor area being ventilated.
addition or patio cover, provided that there is an openable
area between the adjoining room and the sunroom addition
minimum openable area to the outdoors shall be based upon
the total floor area being ventilated.
R303.3 Bathrooms. Bathrooms, water closet compartments
and other similar rooms shall be provided with aggregate
glazing area in windows of not less than 3 square feet (0.3 m2),
one-half of which must be openable.
No separate listing for Bathrooms
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Exception: The glazed areas shall not be required where
artificial light and a mechanical ventilation system are
provided. The minimum ventilation rates shall be 50 cubic feet
per minute (24 L/s) for intermittent ventilation or 20 cubic feet
per minute (10 L/s) for continuous ventilation. Ventilation air
from the space shall be exhausted directly to the outside.
Questions:
1. The definitions between the 2 codes are different NCRC uses habitable rooms and the
NCMC uses occupiable spaces. It appears that the NCMC has more requirements than the
NCRC in that bathrooms, toilet rooms, laundry rooms, hallways, and possible closets if using
natural ventilation would be required openings to the exterior that match floor area, NCRC
has natural ventilation minimum opening for bathroom and toilet rooms but NCMC doesn’t.
Does the NCMC require hallways, laundry rooms, closets and bathroom/toilet rooms to have
windows to the exterior or adjoining room option if using natural ventilation?
2. In reference to both codes is a door or window considered an intake opening?
3. If a door/window is an intake opening is screening required for opening protection.
4. If a door/window is an intake opening, does the lot line or between building requirements
apply to NCRC as listed in the mechanical code, would this be the interpretation related to
potential contaminants.
5. The IRC and the IMC commentary that support the 2012 codes (2009 version) has conflicting
information related to what is a intake opening and when screening is required (Windows)
and Lot line issues. The IMC clearly has requirements for lot lines that the IRC doesn’t talk
about and the IRC has no reference to “except windows and doors” as listed in the IMC
commentary for intake openings. How should this be applied?
6. Should the requirements match in both codes?
4) (Q) Are screens allowed on outside vents?
(A) Yes. 401.5 MC and IBC, sizing Table 401.5, 2012 MC (Exception: Dryer Vents)
CHAPTER 5 EXHAUSTS SYSTEMS
1) (Q) What would be an adequate amount of make-up air in a residential occupancy if the
dryer is exhausting 50 cfm and the Kitchen hood is exhausting through the roof at the
same time at 40 cfm. How much make- up air would be required?
(A) It depends. Make up air is not required in residential occupancies if natural ventilation
is used per 402, however, if 403 is used then make up air would be required.
Ref: 501.3 exception. 2012 MC
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2) (Q) Would environmental air exhaust ever be considered hazardous or noxious per the
Mechanical code?
(A) No. 501.2.1 #3, 2012 MC “Such exhaust shall not be considered hazardous of noxious.”
3) (Q) A garage is installing a ventilation system to avoid consideration by the electrical code
to be a class 1 division 2 area. Should the fan motors be interlocked with the
electrical receptacles and /or equipment/appliances in the garage to shut down the
power to the apparatus above if the ventilation fans lose power?
(A) Yes. “Electrical equipment and appliances used in operations that generate explosive
or flammable vapors, fumes or dusts shall be interlocked with the ventilation system
so that the equipment and appliances cannot be operated unless the ventilation fans
are in operation.” 503.1 MC 2012
4) (Q) The contractor has the installation instructions for dryer vents for a specific make of
Maytag dryer that will be installed in all the apartments in a 40 unit complex. The
Manufacturers’ instructions show lengths of duct runs that exceed the minimum code
and no equivalent lengths for the fittings used with the dryer duct. Should the
inspector approve the installation?
(A) NO. The inspector should require the contractor to supply an equivalent length chart
for fittings from the manufacturer or re-calculate the runs using the equivalent length
chart in the code (table 504.6.4.1) Ref: 504.6.4.2, 2012 MC
5) (Q) A mechanical contractor is insulating the makeup air duct to a type 1 hood with
standard fiberglass insulation. He has installed the insulation all the way to the hood.
(a) Would this be allowed by the 2012 mechanical code?
(b) What should be used as an alternate method if this is not allowed?
(A) (a) The standard duct insulation should not be allowed within 18 inches of the hood
because of the heat generated by the hood. 506.3.6, 2012 MC
(b) A rated fire wrap material could be used to wrap the duct within 18 inches of the
hood termination. 506.3.6, exception # 3, 2012 MC
6) (Q) A placard has been provided five feet above the dryer exhaust duct connection on the
wall with the dryer manufacturer’s information for duct equivalent length. Does this
meet the identification requirements of the 2012 code for length identification?
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(A) Yes. It would be considered permanent identification. Ref: 504.6.5 MC 2012
7) Situation: A restaurant has installed two barbeque cookers under type I hoods which
exhaust high-medium- & low heat cooking appliances. The food services inspector
discovered the cookers and reported it to the Code Enforcement Department.
Answer a. through e. below.
a. (Q) The owner says the cookers are safe as installed and they are code compliant. (1) Is
the owner correct? (2) What are the obvious code violations related to this
installation?
(A) (1) The owner is not qualified to determine the safety of the equipment. The restaurant
installed the cookers without plans or permits. Require cookers to meet the code. Ref:
106.1, 106.2.1 Administrative Code.
(2) Since the cookers use solid fuel and gas for heat for cooking they are classified as
extra-heavy-duty cooking appliances and cannot be located under the same type I
hood with high-medium & low heat appliances. Ref: 507.3.4 MC
b.(Q)Three Type 1 hoods for the cooking equipment are connected to single grease
exhaust duct that exits the building into a covered parking garage. (1) Can the separate
hoods required for the two Extra-heavy-duty cooking appliances be combined with the
existing grease duct exhaust if properly sized? (2) May the grease duct from the extraheavy-duty appliances exhaust into the covered Parking deck?
(A) (1) No. Hoods for the two extra-heavy–duty barbeque cookers shall exit the building
through a separate exhaust duct system. The two cookers may, however, be under the
same Type 1 hood rather than having separate hoods or under a hood or hoods listed
for the application by the manufacturer. The exhaust systems may also be combined
since both are extra-heavy-duty cooking appliances. Ref: 507.2.4, 506.3.5 exception # 4
(2) No. It is a violation to have the current hood system grease duct exit the building
into a parking garage. The new grease duct shall exit the building either vertically or
horizontally to the outside. Ref: 506.3.12.2, 506.3.12.3, 506.5.5
c.(Q) Are there more stringent exhaust requirements for hood exhaust CFM and safety
devices for a hood over an extra-heavy-duty cooking appliance than over high-mediumlow & heat cooking appliances?
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(A) Yes, see ventilation tables. Ref: 507.13.1
d.(Q) The manufacturer of the barbeque cookers sends a letter to the Code Administrator
with information on the engineering of the cookers. The letter explains how the cookers
are engineered/designed to make it virtually impossible for a spark or ember to be
exhausted into the duct system. The letter also states the cookers can be located
under the same type I hood with high-medium-low heat cooking appliances. Further, the
letter states the information will be included in the manufacturer’s literature in the
future on the two cookers installed at the restaurant plus 5 other models of cookers with
similar exhaust characteristics. Should the Code Administrator accept the manufacturer’s
letter and approve the cookers? (note: The manufacturer does not have a registered PE
on their staff.)
(A) The code official may accept the letter under the conditions stated above if a
professional engineer who works directly for the factory provides a letter under his seal
that the changes to the literature will be made. The letter must also provide information
as to how the engineering/design of the product is such that a spark or ember can never
be exhausted from the cookers that may cause a grease fire in the ductwork and ignite
fires in heavy-medium or light duty appliances that may also be under the hood. Ref:
105.2 MC
e. (Q) Should the Code Administrator require a third party test that confirms the cookers
will not emit sparks or embers into the grease duct system before he approves the
cookers?
(A)This may be one solution the Code Administrator would allow. Ref: 105.3, 105.3.1,
105.3.2 (MC).
8) (Q) a. What is the new clearance requirement in the 2012 Mechanical Code from operable
openings for all environmental air ducts? b. Can environmental air ducts ever be
considered hazardous or noxious?
(A) a. Three feet, Ref: 501.2.1 (MC)
b. No. Ref: 501.2.1 (MC)
9) (Q) Is exhausted air ever allowed to discharge into walkways or hallways?
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(A) No. Ref: 501.2.1.1, 2012 MC
10) (Q) Will the mechanical code allow exhaust outlets to discharge at or below the design
flood level (elevation)?
(A) No. 501.2.1 # 4 required 2012 MC, interpreted as required by the 2009
code (2009 501.4 ref. Ch 6, [B] 602.4)
11) (Q) (a) Are all occupancies required to provide pressure equalization when the system is
exhausting quantities of air? (b) Are there specific occupancy exceptions for
appliances and fans and if so what are they?
(A) [note: The 2009 code exempted R 3 occupancies only with no mention of specific
appliances or exhaust exceptions.] (a) The 2012 code exempts dwelling units in R 2
occupancies. (b) The 2012 code does not require pressure equalization for domestic
exhaust systems in residential occupancies and similar uses (domestic clothes dryers,
domestic range hoods, domestic bathroom exhaust). 501.3 and 501.3 exception,
2012 MC
12) (Q) A Mechanical Contractor is installing a 100 cfm bathroom exhaust fan in the kitchen
ceiling for a new housing development to meet requirements of table 403.3 footnote
b in the 2012 Mechanical Code. He is not installing a kitchen hood over the 4 burner
electric range and the manufacturer does not call for a hood.
Does this installation meet the code for table 403.3 ft. note b requirements of the
2012 Mechanical Code?
(A) Yes. If a mechanical ventilation means is provided per 403.1 MC 2012.
[See 401.2. Ventilation shall be required either by using 402 (Natural Ventilation) or
403 (Mechanical Ventilation).] [See 505.1 Exception 1 “where natural or mechanical
ventilation is “otherwise provided” listed and labeled ductless range hoods shall not
be required to discharge to the outdoors.] Question: If the manufacturer does not
require a hood over the cooking equipment would a ductless hood be required? No.
13) (Q) Is a Type I or a Type II hood required over an electric egg cooker that operates under
3000 Watts?
(A) No hood is required. Ref: 507.2.2 Exception #4, 2012 MC
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14) Project Information: The mechanical design for the a Plant Upgrade consists of the
installation of an air cooled chiller and a chilled water pumping system on the roof adjacent
to the existing air cooled chillers.
The electrical design for this work included an electrical equipment room located within the
garage having a UPS system having closed cell batteries. The electrical equipment room
design has a 2 hour fire rating and includes an air conditioning unit for heat removal with an
exhaust air system, if required, for the removal of hydrogen gas vapors.
The closed cell batteries are limited to the UPS equipment and emit very little hydrogen gas.
As a result, these batteries do not require an exhaust air system by the mechanical code.
However, to be safe, the owner has designed an exhaust air system to protect the electrical
equipment room in the event of an emergency.
The exhaust air system will be normally off and will be controlled by a hydrogen gas detector
installed within the electrical equipment room. When activated, the hydrogen gas detector
will start the exhaust air system and provide a local audio and visual alarm at the electrical
equipment room and at the building BAS system.
The exhaust airflow rate from the electrical equipment room is 150 CFM and it discharges
into the garage which is open to atmosphere for its ventilation air requirements. As a result,
it is our opinion that the exhaust air system is discharging to the outside and that it will have
no impact on the garage environment. The plans examiner has turned the plans down
requiring the exhaust to go outside the building. He says garage or loading dock is not
considered outside the building per mechanical code. The exhaust duct also has fire dampers
in three locations where it penetrates fire rated walls. The plans examiner will not allow fire
dampers in a hazardous exhaust system and is requiring the installation to be in shaft from
the electrical room to the outside wall penetration.
(Q) What can be done to allow the protection as shown on the plans?
(A) The plans examiner is correct. If your intent is to protect the electrical room from a
possible emergency situation then the installation as described by the plans examiner
is in compliance with minimum code. You have two choices. Meet the code minimums
described or remove the emergency system.
Ref: 510.1, 510.5.7, 510.6.1, 510.6.3 MC 2012
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CHAPTER 6 DUCT SYSTEMS
1) (Q) DOI, September 1, 2011, 2012 MC
If two or more air-handling systems serve a common space and one or more of these
systems serve additional spaces and the aggregate capacity of the combined systems
exceeds 2,000 cfm, what are the requirements for smoke detectors per Section
606.2.2?
(A) Section 606.2.2 requires that when two or more air systems serve common supply or
return ducts or plenums with a combined design capacity greater than 2000 cfm, the
return system shall be provided with smoked detectors. Section 606.2 states that
smoke detectors are not required where the air distribution system is incapable of
spreading smoke beyond the closing walls, floors and ceiling of the room or space
win which the smoke is generated. If two or more systems serve a common space, but
do not share common ducts or plenums, and each system has a design capacity of
2,000 cfm or less, no smoke detector is required. If their combined design capacity is >
2,000 cfm, and no single unit has a design capacity of 2,000 cfm or more, no smoke
detector is required because they do not share common ducts or plenums.
If multiple systems share common ducts or plenums and the distribution system is
incapable of spreading smoke beyond the enclosure of the room or space where the
smoke is generated, and then no smoke detector is required.
Keywords: smoke detection system control. 602.2, 2012 MC
2) (Q) Is painting exposed galvanized duct allowed by code for weather protection?
(A) Weather protection would not be required if the ductwork installation is approved by
the manufacturer for outdoor locations. Ref: 303.6, 603.1, MC 2012
3) (Q) Does a filter box have to be manufactured of can it be constructed in the shop of the
Mechanical Contractor?
(A) The Mechanical Contractor may construct the box to meet the code. 603.1, 2012 MC
4) (Q) What method can be used to protect the openings in a floor/ceiling or roof/ceiling
assembly where supply air duct from the HVAC unit penetrates the membrane of the
assembly? The type of occupancy is R2 multi-story with type V construction.
Note: The Mechanical Code calls for either a shaft, 607.6.2 #1, or a listed ceiling
radiation damper installed at the ceiling line, 607.6.2 #2, and a listed ceiling radiation
damper installed at the diffuser with no duct attached 607.6.2 #3 (supply plenum).
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(A) There is an issue that needs to be addressed with 607.6.2 #2. UL 555C and 607.3.1
would require the radiation damper to have dynamic closure because the unit fan will
continue to run in a fire or smoke condition. 607.3.1 States; “Only fire dampers listed
or labeled for dynamic systems shall be installed in heating, ventilating, an airconditioning systems designed to operated with fans on during a fire.” There is no
shut down required by code for the fan of an air handler in an apartment HVAC
system for example, therefore, the code and UL 555C require a dynamic type
damper for this installation. Per current DOI information a dynamic radiation damper
listed for mounting in the membrane ceiling of the penetration shall be used. As an
alternate method the air handler must be shut down in case of fire. This can be
accomplished by installing a smoke detector in the room adjacent and open to the air
handler. You are no longer required to tie it into the smoke detector system of the
apartment unit. If you opted for the smoke detector you still are required to protect
the penetration with a radiation damper, however, since you have provided a means to
shut the air down via the smoke detector you can install a standard radiation damper
with static and not dynamic closure. These are the only two methods approved at the
present time. Ref: 607.6.2 #2, 607.3.1, UL 555 C, 2012 MC
CHAPTER 11 REFRIGERATION
1) (Q) What is the proper procedure to use for changing out the outside condenser only in a
mixed system where the old evaporator continues to be used? Current system
refrigerant is R22 and the new refrigerant will be R 407 C. (Both are Class A1)
(A) Recovered refrigerants shall meet 1102.2.2.2 requirements. 1101.8 notification of
code Official of change of refrigerant. 105.5 equipment re use. 304.1 manufacturers
data req’d. See also 301.1.1, All references in this answer are from the 2012 MC
.
GENERAL INFORMATION (Admin. Code/ Mech. Code Admin. Section/ Policy)
1) (Q) Are permits required for B vents when a re-roof permit is pulled for a building with gas
flues penetrating the roof?
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(A) Yes. Alteration of the vent will require a permit. Ref: (102.1/GS 87-21/GS 153-327
Admin. Code), (102.9 2012 MC). A letter is on the Meckpermit.com web site under the
Mechanical Section click on “news and updates” there is a link on that page for the reroof permit requirements.
2) (Q) Unitary equipment is being installed in a hotel room. E.g. ptac unit in a hotel. Are
permits required for this installation?
(A) If this is a like for like change out permits are not required. If it is a new installation it
should have permits and inspections if it has a hidden drain/ electrical connection.
Ref: 106.1 Administrative codes.
3) (Q) What types of installations do not apply to a refrigeration trade or business and are not
required to be installed by a refrigeration contractor?
(A) House Bill 1105 was recently passed by the General Assembly and signed into law by
Governor Perdue. Changes to the law are summarized as follows:
Section 1 provides that “refrigeration trade or business” does not apply to the following: (1)
The installation of self-contained commercial refrigeration units equipped with an original
equipment manufacturer (OEM) molded plug that does not require the opening of service
valves; (2) the replacement of lamps, fuses and door gaskets; and (3) the installation and
servicing of domestic house-hold self-contained refrigeration appliances equipped with an
OEM molded plug connected to suitable receptacles which have been permanently installed
and do not require the opening of service valves.
4) Situation per Designer: A couple of weeks ago we discussed an old (approx. 35 years)
building (approx. 15,000 sq. ft.) utilizing the original hallway for the return. The ceiling is
extremely tight and there is no real room or access or practical method for adding a return
duct. It is served now by a couple of self-contained single zone units utilizing boiler hot water
and condenser water. We want to replace the ancient units with split systems with the AHU
installed in the same mechanical rooms, with condensing units on the roof and utilizing the
same single zones – no changes to ductwork. There is really no other practical/efficient/cost
effective way to replace the ancient units and get rid of the ancient boilers and cooling
towers. We know we need to submit the mechanical, electrical, and structural but really
need to know about the hallway return before we spend a lot of effort and money. When we
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talked before you indicated that this hallway return could be grandfathered since it is very
close to being like-for-like and there is no work other than replacing the central unit.
(Q) Can we still utilize the hallways for returns?
(A) Yes. Since you are doing away with an ancient cooling tower and boiler you we will
need a split system with a condenser on the roof. There will be no changes outside of
the mechanical room and roof. The installation will be allowed per the conditions
specified. 105.3, 2012 MC
5) (Q) What are the current requirements for installing Carbon Monoxide detectors in
residential single family dwellings, duplexes and townhomes? Is the requirement
the same for commercial construction?
(A) In general, a change out of fossil fuel equipment in a residence will require the addition
of a Carbon Monoxide Detector per GS. CO2 detectors are currently required adjacent
to each sleeping area per BCC rules. An all electric residence is exempt unless
they currently have an existing attached garage or are adding a new attached garage
or have or are adding a fireplace. If these conditions are present Carbon Monoxide
Detectors are required even if they do not have fossil fuel equipment. Fossil fuel fired
equipment such as a hot water heaters in a hut attached to the house are exempt from
the CO2 detector requirements, however, a gas pack or other appliance that is
communicating with the inside of the house is not exempt. The “special exemptions”
only apply to single family dwellings, duplexes and townhomes. Not required
for commercial occupancies. If a “plug in type or table model” Carbon Monoxide
detector will be used the inspector shall have ready access to the detector on the
premises. It must be in the box and readily accessible for the inspector. Having an
empty box for the inspector or taping a box to the inside of a window is not acceptable.
6) (Q) What are the plan review requirements for compliance with the new energy code
when a plan is submitted for an addition to a single family home to RTAC? The
contractor is submitting plans for an addition. The plans show extending the existing
duct and using the existing HVAC system.
(A) RTAC will not be checking the plans for energy code requirements.
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7) (Q) What tools are currently available to help inspectors with Energy Code field
compliance? (Ref. Dept. of Energy information below, will discuss DOI information
under training information later on the agenda)
(A) Per the meeting on energy code on Friday May 18th at the Dept of energy site has both
a residential and commercial checklist for the IECC codes. See the link below.
http://www.energycodes.gov/arra/compliance_checklists.stm
8) (Q) (1) Would the 2012 Energy Code require the inspector to witness a duct leakage test for
a single family dwelling? (2) Is a whole house or partial blower door test
required to be witnessed by the inspector?
(A) (1) No. 402.4.2 EC (2) Yes. 4032.2 EC
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CHAPTER 2 DEFINITIONS
1) (Q) While inspecting a lab set up for acid waste and vent piping in a medical office
building the inspector finds the acid waste piping system installed without the
minimum required vent sizing requirements for DWV per code. The inspector asks
for and receives the documentation on the engineered system. Should the
Inspector question the seal if a structural engineer seals the design document?
(A) Yes. Current code would require an engineer in his respective design profession to
seal the design. Under the 2012 Code it depends on whether the licensing board
deems them qualified by the state board of rules and regulations. 2009 code:
“licensed to practice in his respective design profession” New Code: “registered
and licensed to practice professional architecture or engineering as defined by
statutory requirements…………” Ref: 2012 NCPC. Chapter 2 definitions Registered
Design Professional
CHAPTER 3 GENERAL REGULATIONS
1) (Q) An engineer has designed a gray water waste recycling system, including all DWV,
located in the basement of a single family dwelling. The system is designed to
allow full flow throughout the system so the engineer has decreased the
minimum pipe sizes of the DWV associated with the gray water system to one
pipe size smaller than the minimum code would allow. Would this
installation be allowed per the 2012 NC Plumbing Code?
(A) No. “All drain, Waste, and Vent piping associated with gray water recycling
systems shall be installed in full compliance with this code. “Ref: 301.3, (2012)
2) (Q) A contractor is installing a rain water recycling system. His explanation to the
Inspector; he is connecting indirectly to the sanitary drainage system so he does
not have to use the code minimum sizing requirements for the plumbing piping.
Should the inspector pass the rainwater DWV system?
(A) No. The 2012 Code requires gray water and rain water recycling systems to meet
minimum code requirements for DWV. The drainage system cannot connect
indirectly to the sanitary sewer. Ref. 301.3, 2012 PC
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3) (Q) A plumbing contractor has installed a floor drain with a deep seal trap in the slab
at the bottom of an elevator shaft in a multi-story office building. The elevators
are all hydraulic type. Can this installation be approved under the 2012 code? Can
it be approved under the 2009 code?
(A) No. New code requires an oil water separator to be installed in the discharge line
of the floor drain. Ref: 301.6 (2012), 301.6, Exception. 2009 Code would not
require an OWS to be installed. Per research of hydraulic elevator fluid capacities
and spill probabilities an OWS will not be required by Mecklenburg County.
See Plumbing interpretations on the web site for current information.
4) (Q) The manufacturer of a new brand of AAV allows a 20 degree deviation from
vertical on the vents installed in an attic. If the plumbing code had a minimum
standard that only allowed an 18 degree deviation, which of the two installations
should be approved by the inspector?
(A) The code minimum shall be met because it is more restrictive. 301.7, Exception,
2012 PC
5) (Q) Upon inspecting the sanitary sewer and water distribution piping on a single family
home the inspector finds the piping covered up in the right of way. Is the inspector
required to inspect in the right of way or is he restricted to private property?
(A) Unless a utility contractor has already installed the water and sewer to the
termination point at the building the inspector is required to inspect the installation
from the cleanout at the house to the connection at the utility. Inspections are
required to determine compliance with 306.1 through 306.3, 2012 PC
6) (Q) The pump for a domestic hot water recirculation system is located below the
design flood elevation in the garage of a single family dwelling located close to the
ocean. Would this installation be allowed by the 2012 code?
(A) A pump for domestic water cannot be installed below the design flood elevation.
The exception allowing the pump in the 2009 code has been deleted from the
2012 code. Ref: 2012 code see item 2 is deleted from the exceptions. 2012 NCPC
[B] 309.2 Exception (deleted)
7) (Q) All permanently installed water closets in buildings are required to be in a separate
room or stall per the 2012 Plumbing Code. What are the two locations exempted
by the 2012 code?
(A) Child Care facilities and facilities where restraint is required per the building codes.
Ref: 310.4, exception 3, 2012 PC.
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8) (Q) An inspector is witnessing the testing of the plumbing system on a single family
dwelling. The dwelling has several shower installations. The inspector has turned
the job down because the plumbing contractor has not provided a shower pan liner
test. Is this a required inspection under the 2009 Plumbing Code? Is it a required
inspection under the 2012 Plumbing Code?
(A) The 2012 code test procedures require a shower pan test. REF: 2012 NCPC
312.9. The 2009 code did not address shower pan testing.
CHAPTER 4 FIXTURERS, FAUCETS AND FIXTURE FITTINGS
1) (Q) Can a mercantile occupancy use the code exception in 410.1 to eliminate drinking
fountains?
(A) No, Drinking Fountains are required in a mercantile occupancy once the occupancy
count exceeds 100. The exception for requiring drinking fountains in 410.1 only
applies to A 2 occupancy classifications which are restaurants, night clubs, taverns
and bars. Table 403.1 (See A-2 occupancy No. 1 and Mercantile occupancy No. 6
requirements in the 403.1 table) and 410.1, 2012 PC
2) (Q) Can we replace a bathtub with a walk in shower (only one bath room) in a condo?
(A) Yes the fixture tables will allow either a tub or a shower to meet the minimum code
requirements. Table 403.1 R-2 occupancy, PC 2012
3) (Q) I am trying to calculate the required number of toilet fixtures for a charter school.
As I understand things, the relevant information is as follows:
•
•
Charter schools are public schools authorized by the State Board of Education
Charter schools are exempt from most of the NC General Statutes that relate to
schools, including GS115C-301 which is referenced in the code.
• Charter schools have a maximum enrollment given in the charter. The charter is a
legal document between the NCBOE and the charter school that governs most aspects
of the school’s operation.
As I review the code, the relevant section of the 2012 NC Building Code appears to be
2902.6 Plumbing Fixtures for Public Schools. 2902.6.1 states that “Occupant content of
public schools for the purpose of determining the number of required facilities shall be
the maximum legal class size multiplied by the number of classrooms. Maximum class
sizes are 29 students for grades K-9 and 33 students for grades 10-12 (GS 115C-301). The
occupant load for private schools shall be as listed in Table 1004.1.1 of this code.”
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The issue that I have is that while charter schools are public schools and therefore would
appear to fall under this section, they are not bound by the NC General Statutes that
relate to class size. They are actually bound by the number of students listed in their
charter, which is typically far less than the maximum in the General Statutes. I would like
to use this number as the occupant content for the school for the purposes of
determining the number of required fixtures.
In my case, using the traditional calculation given in 2902.6.1, I would end up with 797
students, but the school’s charter caps the number of students at 442. Again, the charter
is a legal document that the school is bound to follow.
Barring this, it would be preferable to use the number of classrooms x (square
footage/20net) as is the method for private schools since this would more closely
approximate the actual number of students at the school than the method for public
schools in 2902.6.1.
(A) Even though this is a public school we would allow the calculation of the class
rooms for students to be calculated at the number of classrooms x (square
footage/ 20 net). This is a charter school and it is similar to a Montessori school.
These schools are unique when compared to a public school student populations
Your calculation would meet the table 1004.1.1 of the Building Code similar to
private schools in 403.9.1 PC 2012.
4) (Q) Can a commercial two compartment sink be used as follows:
Compartment A (left hand) waste is tied in indirectly for food prep. Compartment
B (right hand) waste is tied in directly for a pot sink per the 2012 code NCPC
802.1.8 Is this permissible?
(A) This is permissible. Each section of the sink may be considered separately for
DWV requirements to meet minimum code. Not prohibited by 418.
5) (Q) (1) Does 419.1, 2012 PC, require a waterless urinal to be supplied with a
permanent connection for a future water supply? (2) If yes, when I have
multiple urinals in a bathroom would a single water line stub out be acceptable
for all urinals or will each urinal requires a separate water line stub out?
(A) (1) Yes. 419.1 Exception. (2) Provide a future connection for each urinal separately
and/or approximately every 4 feet. 419.1, 2012 PC
6) (Q) An inspector is called to re-inspect an apartment that has been recently occupied.
It is one of the apartments in a newly completed complex of over 100 units. While
inspecting a new water connection he notices the water heater temperature is
set at 140 degrees. What should the inspector do per the 2012 code?
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(A) The inspector should inform the tenant, contractor and landlord that an anti scald
valve is required if the temperature is set above 120 degrees in the dwelling
units. Ref: 424.3, 102.9, 2012 PC
7) (Q) Does the 2012 code require “domed/elevated “floor drains in restaurant floors?
(A) No. The code has not changed. Floor drains should not present a tripping hazard
if they are in the path of travel or egress. (See also NC Building Code) 412, 2012 PC
CHAPTER 5 WATER HEATERS
Number 1 through 13 below is the specific code requirements related to water heaters
1) *See NC General Statutes/Administrative Code change-out permitting requirements
for one and two family dwellings (a) through (k) below*
a) The work is restricted to one or two-family dwellings only (no buildings with three or
more dwelling units and no commercial buildings).
b) The work has to be performed by a North Carolina Licensed Plumbing Contractor (or a
bona-fide employee of a North Carolina licensed Plumbing Contractor)
c) The licensee is required to personally examine the work at completion.
d) The licensee is required to ensure that a leak test has been performed on the gas
piping.
e) The energy use rate or thermal input is not greater than the water heater which is
being replaced.
f) The replacement is required to be installed in accordance with the current edition of
the State Building Code (plumbing section).
g) There is no change in fuel.
h) There is no change in energy source.
i) There is no change in location.
j) There is no change in capacity.
k) There is no change in routing or sizing of venting or piping.
* If any of the above requirements are missing, permits/inspections are required*
2) All water heaters (including electric), if either in a garage or a room leading directly off
a garage must be on a stand (ignition source elevated 18"- unless FVIR listed) and have
vehicle protection, if in the travel path of a motor vehicle as per the NCFGC or NCMC.
3) Gas water heaters must have a union or (flare fitting if copper), or a listed flexible gas
connector approved for the location on the gas line, as well as an appliance drip leg
that has a 90 degree change of direction in it (if not on the appliance MP regulator).
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4) Gas water heaters must have the venting attached per manufacturer’s instructions.
5) Electric water heater change-outs must have a means of disconnect (NEC Article 422)
6) All water heaters must have the manufacturer's clearances two sides, top, back, and to
combustible construction- this includes appropriate piping insulation for water piping
in unconditioned areas.
7) All water heaters must have approved dielectric unions/fittings on the water piping
(unless prohibited by manufacturer’s installation instructions).
8) Manufacturer’s Installation instructions must be left with the water heater.
9) On city water systems, an expansion tank must be added for a tank style heater, and
for a tank-less heater if the manufacturer requires it. A well supplied system may not
if it has an expansion tank on the well and no backflow devices.
10) T&P discharge lines may only serve a single relief device and shall not direct connect
to piping serving any other relief device or equipment and installed as per NCPC 504.6
11) Where water heaters or hot water storage tanks are installed in: (a) remote locations
such as a suspended ceiling, (b) attics, (c) above occupied spaces, or (d) unventilated
crawl spaces, the tank or water heater shall be installed in a galvanized steel pan
having a material thickness of not less than 0.0236 inch (0.6010 mm) (No. 24 gage), or
other pans approved for such use.
Exceptions:
a) Electric water heaters may rest in a high-impact plastic pan of at least 1/16 inch
(1.6 mm) thickness.
b) Water heater mounted on a concrete floor sloped to a floor drain. EG; equipment
rooms
12) Pan drains shall be no less than 1.5 inches deep in the pan, no smaller than 1 inch
diameter and will be constructed from materials listed in NCPC table 605.4
13) Discharge through an air gap located in the same room as the water heater, either on
the floor (if on concrete slab), into an indirect waste receptor or outdoors.
14) (Q) A T&P relief line terminates only slightly (the thickness of a piece of paper) above
the drain pan for a tankless water heater located in the attic of a three story
townhome. What is the proper height of the gap above the drain pan for the T& P
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relief line if the line is sized to meet minimum code? If the drain line is one inch or
more above the drain pan is splashing an issue that would allow a reduced height
for upper floor or attic terminations?
(A) 504.6 #5 would allow the discharge line from the T&P relief line to discharge into a
water heater pan. The code does not address the minimum height above the pan.
In 802.3.1 the code states that receptors shall be installed to prevent splashing.
The maximum height above the pan would be 6 inches but the minimum could be
as close to zero as the contractor wants to install the relief line. 802.2.1, 802.3.1,
504.6 #5, #6, #10, 2012 PC
CHAPTER 6 WATER SUPPLY AND DIDTRIBUTION
1) (Q) An underground combined water/fire service line is installed to supply both fire
sprinkler and potable water to a building.
A) Can the FDC (Fire Department Connection) to the building be installed on the
potable water side of the water service piping?
B) Is protection required for Fire Hydrants when branch lines are located on the
potable water supply line.
(A) A) No. The potable water shall be protected from the sprinkler water in the
building by a backflow device that meets the code. The combined line shall
meet the requirements of the State Plumbing Code first for protection, material
and testing. Once that has been done the Fire Code requirements shall be met.
Ref: 608.13
B) Yes. When Fire Hydrants or other Fire Apparatus are located on the potable
water supply and the main water line shall be protected from the turbid water
that is located in the water line to the hydrant by a backflow device meeting
minimum code. The backflow device shall be installed on the FDC branch as
close as possible to the branch connection to avoid turbid water from
entering the domestic water line and contaminating the potable water.
Ref: 608.5, 608.13
2) (Q) The specifications for a new commercial building call for Polybutylene (PB) water
service and water distribution pipe to be used on a project permitted under the
2012 Plumbing Code. Should the plans examiner approve this material?
(A) No. The 2012 code has removed PB from the list of approved material for water
service piping. Ref: Table 605.3, table 605.4, 2012 PC
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3) (Q) Sanitary Sewer piping cannot have restrictions to flow because of the waste buildsup and eventual clog resulting from the restriction either in pipe size reduction
or use of a fitting with shoulders that would disrupt flow. Would the 2012 code
require the same restrictions on water pipe fittings?
(A) Yes. “fittings shall not have ledges, shoulders or reductions capable of retarding or
obstructing flow in the piping.” Ref: 605.5, 2012 PC
4) (Q) Is cross link aluminum PEX allowed in the 2012 code for water distribution, water
service and fittings?
(A) Yes. See 605.21, 605.21.1, and tables 605.3, 605.4 and 605.5, 2012 PC
5) (Q) A Would a stop- and- waste valve be allowed under the 2009 code? B. Would a
stop-and –waste valve be allowed under the 2012 code?
(A) A. No. Not allowed 608.7 2009 NCPC
B. Yes. See 608.7 Exception NCPC Freeze proof yard hydrants that drain the
riser into the ground shall be permitted to be installed, provided that the
potable water supply to such hydrants is protected upstream of the hydrants
in accordance with Section 608 and the hydrants are permanently identified as
no potable outlets by approved signage that reads as follows: “Caution, Non
Potable Water. Do Not Drink.”
6) (Q) A backflow preventer is protected from freezing by the installation of unions
that are easily removed. Is this an acceptable means of protection from freezing
per the code?
(A) Yes. 608.14.2, 2012 PC.
7) (Q) A reduced pressure principal backflow preventer installed inside a building has
the relief port piping terminating in an air brake located outside the building. Is
this an acceptable termination per the code?
(A) Yes. As long as it is terminated outside the building. 608.14.2.1
8) (Q) What are the special piping material requirements for installing a NFPA 13 D
sprinkler system in a single family residence for a partial system? For a full fire
sprinkler system?
(A) There are no special material requirements for a partial system, standard water
piping per the North Carolina Plumbing Code is required if the installation is a
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partial add on system. 614.4 #4 2012 PC. A full 13D system would have to meet
NFPA 13D material requirements. 615.1 2012 PC
CHAPTER 7 SANITARY DRAINAGE
1) (Q) An engineering firm has submitted plans to construct a building with a large
meeting room located in a park in Mecklenburg County. The meeting room will be
rented by the parks department for meetings and social occasions. Neither the
parks department nor the health department (food services) will allow food to be
prepared on the site. The prep area contains a 3 compartment sink and a six
burner residential range with a type 2 hood. The waste for the building is drained
into a septic tank. Septic tank installations are required to be approved by the
Mecklenburg County Groundwater and Wastewater Dept. (GWWD) The
GWWD dept. will not require a grease interceptor on the site. The Code
enforcement department will require a point of use interceptor at the 3
compartment sink. The GWWD concludes the interceptor shall be installed
outside the building and meet their installation requirements. What should be
done to resolve the conflicts between the two departments?
(A) As with the minimum building codes the most restrictive requirements shall apply.
The grease interceptor is required it has to meet the minimum standards of both
the GWWD and the Mecklenburg County Code Enforcement Department code
minimums. The sanitary waste and vent system installation is required to be
permitted and inspected by the code enforcement department up to the
connection at the septic tank. Ref: 701.1, 701.2
2) (Q) In a residential single family dwelling that has 4 bathrooms with water closets, the
waste in the basement bathrooms is pumped to a lift station, the two upstairs
bathrooms drain by gravity. Would the main drain required be a 3 inch or a 4 inch?
(A) Even if the DFU’s calculation for the basement pump may allow a smaller main
drain if sloped at one quarter inch the main drain is required to be a 4 inch
because of the number of water closets discharging into the main drain.
Table 701.1 (1) footnote c, 2012 PC
3) (Q) What is the intent of adding the exception in the 2012 code eliminating the use of
PVC pipe and fittings for sanitary and storm sewer installations in high rise
buildings?
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(A) Bill Moeller, PE, DOI Chief Plumbing/Fuel Gas. Interpretation.
The intent was to limit the use of plastic pipe for drain, waste, storm water and
vent in walls and concealed spaces in buildings in which the top floor is over 75 feet
above the grade of fire department access. Therefore exposed fittings under sinks
could be plastic. Pipe and fittings in walls and concealed in ceiling spaces could not
be plastic for these types of buildings. This code language goes back to what was
used prior to adoption of the ICC codes.
Therefore (1) PVC can be used underground, (2) piping in an adjacent building less
than 75 feet to the highest occupied floor can be plastic, (3) run-outs from stacks
should be cast iron, (4) concealed construction should not be plastic, (5) under sink
fittings and traps can be plastic and (6) PVC washing machine boxes are not
concealed and can be plastic. Material installed between the floors such as Pro Set
is not allowed. Ref: 702.1 Exceptions, 702.4 Exceptions, 1102.2 Exceptions, 1102.7
Exceptions, 2012 PC
4) (Q) An AAV is installed on a plumbing vent. The AAV is specified from the
manufacturer for multiple applications. The 1(1/2) inch AAV may be installed
directly to a 1 (1/2) inch pipe (outside) or glued (inside) a 2 inch pipe. Does the
installation meet code and manufacturers recommendations?
(A) No. The manufacturer of the pipe will not allow gluing on the inside the pipe.
Ref: 702.4, 2012 PC
5) (Q) Can the inside of a PVC pipe be used as a fitting to glue a cleanout or a closet
flange?
(A) DOI interpretation, September 2011. No, Section 702.4 states "pipe fittings shall
be approved for installation with the piping material installed and shall comply
with the applicable standards listed in Table 702.4. Table 702.4, PVC fittings
reference ASTM D 2665, ASTM F 1866, ASTM D 3034, and ASTM D 2949. Other than
not meeting these standards, inside pipe diameters can vary significantly as the
wall thickness and outside diameter varies and therefore is not suitable for use as a
fitting socket. 702.4, 2012 PC
6) (Q) The water service has been completed on a project, however, while installing the
sanitary sewer line the contractor runs into a problem. FYI: (The water service
line is crossing the water line at 90 degree angle.) The water line installation will
not allow the proper slope on the pipe to meet the code per the DFU calculation.
The engineer wants to replace the 4 inch sewer line with an 8 inch line so the
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water service will not have to be re-done. With this fix the sewer line will meet
code per the slope requirement and miss the water service line. A. Would this
be allowed by code? B. If no. What are acceptable alternatives that will meet
code?
(A) A. No. 704.1 The “scouring velocity” of the piping cannot be maintained when
using an 8 inch pipe. B. To keep solids suspended a slope with a velocity of 2 feet
per second must be maintained. To use this alternate method the engineer will
have to provide calculations in a sealed letter that show the slope can be reduced
and still maintain the 2fps velocity required to meet minimum code. The 2fps
allowance is in the code commentary and the NCDNR site utility requirements.
The contractor can re-route the water line as an alternate to providing the
calculations. Ref: 704.1
7) (Q) What are the special provisions in the code for heat fusion joints for
Polyvinylidene floride plastic pipe and tubing joints and what test procedure in
required?
(A) Joint surfaces shall be clean and free of moisture. The joint shall be undisturbed
until cool. The joints shall be made per ASTM F 1673. 705.18.8 PC 2012
8) (Q) Can a side-inlet quarter bend be used for wet venting and stack venting?
(A) Yes. Deleted in the 2009 code but it is in the 2012 Code. 706.4, 2012 PC
9) (Q) The section on heel- or –side inlet quarter bends that was deleted under the 2009
code has been added back into the code 706.4. What is the conflict between the
new code article and footnote “f “in table 606.3? What has been added to the
footnote that effects the Quarter Bend installations?
(A) Per DOI we must use the most stringent requirement from all code sections that
apply. See DOI interpretation below as well as the most stringent
requirements that currently apply in the information listed below:
DOI Interpretation from Bill Moeller:
Section 706.4 was deleted in the 2009 plumbing code but was carried forward from the
IPC in 2012. This was a new section that was not deleted by the ad hoc committee and
was approved by the building code council. Since this was a new section it could not be
added to the errata and will stand as is until a building code change request is done and
submitted to the building code council. I have been advising those that ask about it, that
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in the interim we must use the most stringent of the two sections per section 102.1 of
the plumbing code.
There are other ways to work around not using the low heel inlet but they are not as
convenient or economical for plumbing contractors.
Jimmy Lawson is going to put together a code change request. When it is filed with the
code council, so that we get a real code change in the works, I will pole the ad-hoc
committee for their intent. If everyone on the ad-hoc committee agrees that section
706.4 was not intended to be in the approved 2012 plumbing code, I will issue an
interpretation based on the intent of the NC language on footnote f of 706.3.
The short answer is that the most stringent of both sections 706.3 and 706.4 are in effect
at the present time.
Current Code per DOI interpretation: 102.1, most stringent requirements.
706.4 Heel-or side-inlet quarter bends. Current requirements per 2012 code.
1) A quarter bend is an acceptable means of connection. Exception: They cannot serve
a water closet whether the quarter bends is a high-heel or low-heel inlet type.
(706.4)
2) A low- heel inlet shall not be used as a wet-vented connection (706.4)
3) Side-inlet quarter bends shall be an acceptable means of connection for drainage,
wet venting and stack venting arrangements. (706.4)
4) Quarter bend fittings used for change in direction “horizontal to horizontal” shall
only be permitted to be used as the first fitting directly behind the fixture for
fixture drains 2 inches and smaller, except clothes washers.
(Table 706.3 foot note e)
5) Except as noted in # (1) above the high-heel inlet of a quarter bend may be used as
a wet or a dry vent if the heel inlet connection of the quarter bend is located in the
vertical position. (Table 706.3 foot note f)
6) A side inlet connection may be used as a wet vent if the quarter bend is located
directly below a water closet or other fixture with one integral trap. (Note: Other
than a water closet a high- heel- inlet may be used as a wet vent on a fixture with
one integral trap.) (Table 706.3 f)
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7) A quarter bend, installed vertical to horizontal, except as noted in # (1) above, may
be used only within 12 inches below a water closet flange measured to the center
line of the quarter bend. (table 706.3 d)
10) (Q) 406.3 allows a 2 inch clean out for a 3 inch washer line. Is it acceptable to reduce
the size of all cleanouts by two pipe sizes?
(A) No. 406.3 is the only exception to 708.7 which requires the same nominal size for
the cleanout as the drain size until the size exceeds 4 inch at which time a 4 inch
may be used on sizes above 4 inch. Ref: 406.3 and 708.3.5, 708.7, 2012 PC
11) (Q) What is the DFU value and minimum trap size for a Shower when the total rate of
flow is 21.8 gpm? 709.1 PC 2012
(A) Table 709.1 2012 PC DFU 5, Min. trap size 3 inch.
12) (Q) What is the drainage fixture unit value when a waste receptor receives clearwater waste from a freezer?
(A) one –half DFU. 709.4.1
CHAPTER 8 INDIRECT/SPECIAL WASTE
1) (Q) A contractor is installing a service ware washing sink in a commercial kitchen. He is
connecting it directly to the drainage system. Is this allowed by code?
(A) Yes. The 2012 code allows a direct connection. 802.1.8 2012 PC
2) (Q) (1) is there a difference in a hub drain and a floor drain? (2) Do hub drains that are
flush with the floor level require a strainer? Example: Mechanical Closet.
(A) A floor drain is commonly used as a surface drain flush with the floor. A hub drain
usually supplies individual appliance drains piped directly to the hub drain without
a strainer. The hub drain that is cut off flush with the floor should have a strainer
installed. 802.3.2, 2012 PC
3) (Q) An indirect waste receptor (hub drain) is installed above a drop ceiling collecting
condensate from an air handler. Should the inspector approve or disapprove the
job under any or all of the following conditions:
a. The hub drain has a deep seal trap.
b. The hub drain has a deep seal trap and is trap primed from the tail piece of a
bathroom lavatory from the floor above.
c. The contractor installs a metered water line directly to the trap as a primer.
d. The hub drain is installed in a return air plenum ceiling.
e. The hub drain is accessible from a pull down stair.
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f. The hub drain is in an attic that has a permanent stair.
(A) (a-e disapproved) f. approved. Ref: 2009-802.3, 2012-802.3 “Ready access.”
CHAPTER 9 VENTS
1) (Q) Are vent stacks always required for every drainage stack that has five branch
intervals or more?
(A) No. A waste stack vent installed per 910 would not be required to meet the vent
stack five branch interval rules. 903.2 Exception, 2012 PC
2) (Q) A property owner has built a bathroom within 2 feet of the property line on the
side of his house which has been approved by zoning. A vent terminal is located 5
feet from the edge of the roof addition on a 2 in 12 pitched roof. Is this a code
violation?
(A) Yes. 904.5. (not within 10 feet of a property line), 2012 PC
3) (Q) Fixtures within a bathroom group are wet vented by a residential clothes washer
drain line that has been sized 3 inches to prevent sudzing action and allow for
free drainage in the system. Is the wet vent sized properly?
(A) 909.1, 2012 PC. A residential clothes washer drain line shall not be used as a
wet vent.
4) (Q) A group of fixtures on a circuit vent are discharging downstream from water
closet. 901.2.1 states that all fixtures discharging downstream from a water closet
shall be individually vented. Would this be allowed by code?
(A) Yes. 911, 2012 PC.
5) (Q) A circuit vent is installed that has eight fixtures four of which are water closets and
four are floor drains. A lavatory that is individually vented and two drinking
fountains that are common vented are upstream of the battery. Within the circuit
branch there are three urinals that are individually vented. (a) Are there any
special requirements for this circuit vent that would not apply to a standard circuit
vent? (b) Can a floor drain per 905.4 be used to vent the circuit using the
exception? [c] Are there any special conditions for the urinals located within the
circuit branch? [d] What would determine the size of the horizontal branch being
circuit vented? (e) Are the lavatory and drinking fountains allowed upstream of the
circuit vented branch drain?
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(A) (a) A relief vent is not required even though there are four water closets in the
circuit because this is a single floor and not a stack connection. 911.4 2012 PC
(b) No. this venting may be used for an individual floor drain or grease interceptor.
[c] The urinals fixture drains cannot be installed in the vertical they shall enter the
circuit branch drain on the horizontal only if installed within the circuit branch.
911.5 2012 PC
[d] The horizontal branch shall be sized for the total number of fixtures on the
branch. 911.3.1, 911.3 2012 PC
[e] Yes. They shall be individually vented. 911.5 2012 PC
6) (Q) A grocery store is using a combination waste and vent system to drain the clear
water waste from a group of coolers that run the entire length of one isle of the
store. A pump is being used to discharge water from a water bath for melons that
is being continuously circulated and re-charged with water. The pump is
discharging into the combination waste and vent line. The pump has a very low
gpm flow into the system. Would this be allowed by code?
(A) Yes. 912.2.2, 2012 PC. The low gpm would still allow adequate venting for the
combination waste and vent system.
CHAPTER 10 TRAPS, INTERCEPTORS, AND SEPARATORS
1) (Q) I am the plumbing engineer on the new Ralf and Sons restaurant. Does your
department size the grease interceptor for our restaurant? Can a hand sink be
indirect and go through the interceptor?
(A) Our policy is that the engineer sizes, specifies and seals the Grease interceptor.
We don’t get into interior vs. exterior; we just say that we require any drains such
as flat floor drains in the food prep area, pot sinks/3 compartment/food prep/
sinks/ & dishwashers are required to go thru the Interceptor. We request that any
clear water waste, i.e.: hand sinks/ice machine condensate in hub drains, go to
sanitary, to keep the size of the Grease Interceptor as small as possible. You should
specify a style of trap/interceptor and show your calculations, then seal it. Ref:
1003.3.1
2) (Q) An apartment clubhouse has two residential ranges. A type I hood is required over
the ranges. It is the intent of the owner to allow cooking for the tenants who rent
and use a large banquet room in the clubhouse. Should a grease interceptor be
required for this operation? Would a point of use interceptor be allowed if the
kitchen only has a pot sink and a three compartment sink?
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(A) Yes. The cooking in the clubhouse kitchen is not considered non intensive per the
interpretation on our web site and therefore will require at least a point of use
interceptor for each sink. 1003.3, 1003.3.1, 1003.3.4, 1003.3.4.1, Table. 1003.3.4.1,
2012 PC
3) (Q) In the example above if only one range is provided with a type II hood and the
cooking is sporadic and non intensive would a grease interceptor be required at the
two compartment sink in the Kitchen?
(A) If the kitchen facilities utilize a “standard” two compartment or single
compartment sink there is not a need for an interceptor if the operation is as
stated in the question. If they provide a pot sink in addition to the standard two
compartment sink or if the only sink provided is a commercial pot sink or three
compartment sink then we will require a point of use interceptor. (See interceptor
requirements for clubhouses in apartment complexes on the Meckpermit.com
web site.) No change of interpretation for the 2012 code.
CHAPTER 11 STORM DRAINAGE
1) (Q) I have a project for an outdoor pavilion that has a roof with a 1/8th inch per foot
slope to one side. The roof has short parapets. The roof drainage will be via the
parapet scuppers. Since the only plumbing related item is the roof drainage, would
they need a plumbing permit for this or will the building inspector handle the
inspection ?
(A) After discussing this with Gene Morton former Building CA and current Director of
Inspections the following information answers the question. The plan review
scupper sizing, location, materials, etc. is usually checked by the Plumbing
Reviewers. The Building inspector checks the installation. Information
from the Building Code and the Plumbing Code should be utilized by the Plumbing
Reviewer and/or the Building Reviewer to check the primary and secondary
scuppers. The Plumbing reviewer should coordinate with the Building reviewer.
Both codes have specific requirements that are critical to a code compliant
installation. Code Ref: (1106.3, 1106.4 1106.5, table 1106.5, 1107.1, 1107.2, 1109
NC Plumbing Code, 2012.) ([P] 1503.4, 1503.4.1, 1503.4.2, 1611.1, 1611.2, 1611.3,
3201.4 NC Building Code, 2012.)
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APPENDIX REQUIREMENTS
1) (Q) Does the 2012 code regulate swimming pool piping, process piping systems, utility
owned piping systems or rain water recycling systems?
(A) Only rain water recycling systems of the four listed. (Appendix C1 mandatory).
See also page VII.
GENERAL REQUIREMENTS, POLICY, ADMINSTRATIVE CODE
1) (Q) Water piping is being installed in an outside wall. Even though the water piping is
installed on the warm side of the wall insulation the inspector requires the pipe to
be insulated. Is this a code requirement?
(A) Generally not required. 305.6. Laundry rooms on exterior walls may have
insulation requirements because of the number of openings in the wall. If this is
the case the plumbing or the building inspector may require R6.5 to be installed in
the exterior wall. 101.3, 2012 PC, protection of the plumbing system.
2) (Q) I am adding a 3 compartment sink to an existing restaurant. I will supply a point of
use interceptor for the 3 compartment sink and a pot sink. Do I have to supply a
grease interceptor for the existing floor drains and can wash?
(A) No. We would not require you to chop up the floors to re route the plumbing to an
outside grease interceptor unless there is evidence of grease clog maintenance on
the drains in your building on a regular basis. You are either improving the situation
or protecting the added installation. Departmental Policy per 102.2, 2012 PC
3) (Q) Plumbing permits are currently required for repairs when breaking a trap seal
"Unsafe conditions", does this include all traps?
(A) Yes, permits are required for breaking ALL trap seals. (Admin 102.4)
4) (Q) The new 2012 plumbing code has words italicize in the code text. The 2009 did
not have this feature. A. What does it mean when a word within a paragraph in
the body of the code is italicized? B. It is confusing that some of the same words
that are italicized in one paragraph of the code text are not italicized in other
paragraphs. Did the code writer just miss some words and not others?
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(A) Page VI of the new code describes how to understand the italicized words.
A. When a word is italicized in the code text it means it has the exact meaning as
the definition in chapter 2 of the code.
B. If the word is in the definition but not italicized in the code text it does not
have the same exact meaning as the definition.
5) (Q) If the code has a bracket in front of the code text ([B] for Building Code for
instance) does that mean the Building inspector should enforce that section of the
code?
(A) No. The bracket beside the code text means a committee other than the
Plumbing Code change committee is responsible for the change. Enforcement is
still the responsibility of the plumbing plan reviewer or inspector.
6) (Q) Are service stations required to allow customers to use the plumbing facilities?
(A) NC law only requires that public restrooms are required if the occupancy has sit
down dining (hand washing) or in a public facility (Exp: government building,
train/bus station, etc.) This is a Department of Labor regulation. They are required
by law to be constructed per the NC Building code; however, NC Dept. of Insurance
and the Courts have ruled that outside of the above exceptions, if the owners
are denying access, the owner or his designee are well within their rights to deny
access and denial is lawful. Ref: See NC State Dept. of Labor rules and regulations.
General Requirements
7) (Q) Is a code official required to enforce the seal requirements of the North Carolina
Architectural and Engineering licensing boards?
(A) We require seals on plans per the NC Administrative code. We also may require a
professional seal under certain circumstances. Once violations of the state Board of
Professional Engineers and Architects are identified it is up to board officials to
enforce the rules and regulations. 204.3.5, 203.4.5.1, 2012 NC Administrative Code
8) (Q) A contractor wants to use a product called Ape Tape produced by Sioux City
manufacturing for bundling plumbing piping under a crawl space floor. The product
has been approved by IAPMO. Should the field inspector approve the installation?
(A) No. The product is not on the approved list on the ICC web site. We approve ICC-ES
test lab in most cases. See DOI comments from Bill Moeller, DOI Plumbing Chief.
303.4 PC, 2012
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IAPMO is not currently recognized by ICC to my knowledge. I agree that currently
anything accepted under an IAPMO report or certification would be an alternate method
and should be thoroughly reviewed by the AHJ prior to allowing the alternate method.
DOI does not approve materials or products outside of the scope of the ICC-ES approvals
or the standard list of testing agencies approved by DOI. We have issued letters in the
past indicating that certain products can be accepted by the local jurisdiction as an
alternate method. Whether the local AHJ accepts an alternate method is strictly up to
the AHJ.
The list current testing of approved testing agencies is for electrical and mechanical
devices and is administered by our chief electrical code consultant. I would need to know
a lot more about the IAPMO lab accreditations, testing procedures, quality control
programs, surveillance programs, ISO certifications and facilities before I could begin to
make an assessment as to their qualifications as a testing lab. In looking at the attached
IAPMO certification of listing, I have a few comments.
1. The marking requirements are more stringent than that required by our code. This is
good.
2. The installation instructions on page 2 contain 4 misspelled words and poor grammar.
3. The products are stated to comply with the latest ICC codes but fail to mention which
years are applicable.
4. The products are said to have been tested by an IAPMO R&T recognized laboratory
but fails to list what testing lab, the test report number and test date. A copy of the
test report would be good to have.
5. To be a valid test report the manufacturing facility for the product should fall under a
continuing surveillance program to assure that the tested products that were
approved are still manufactured under the same materials, methods and design that
was approved. The manufacturing facilities should be periodically audited by quality
control personnel to assure this. This is not mentioned in the report.
6. It might be prudent to audit IAPMO periodically to verify their processes comply with ISO
standards for record keeping, etc. if they become an approved lab.
7.
I hope this answers your question at least in part. Approval or recommendation of
IAPMO certifications and test reports will take careful evaluation and a better
understanding of their capabilities, processes and accreditations.
Bill Moeller
William H. Moeller, P.E.
Chief Plumbing Code Consultant
NCDOI/OSFM Engineering Division
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9) (Q) I am installing a double sink in the bathroom of a dormitory bathroom that serves
a suite of four rooms. This installation is repeated multiple times through 3 floors
of the dormitory building. The dormitory has a post tension slab and the
bathrooms had to be re-designed to meet handicap provisions. I cannot maintain
the required 30 inch center to center distance required for the lavatories because
an air handler is on one side of the lavatory top that we have reduced to 2 inches
but cannot reduce further or the air handler cannot be removed from the closet.
The other side of the lavatory is a 6 inch wall with the drains and vents for the
bathroom stacks that are sleeved through the post tension floor. We would like to
leave the two sinks for the convenience of the students so two can shave and get
ready for class at one time. We can maintain 27 inches center to center maximum
under the current conditions. The residential code would allow 24 inches center to
center for lavatories. Since this occupancy is very similar to a residential occupancy
would you consider allowing the reduced clearance between the lavatories for this
building?
(A) Under special circumstances where the Plumbing Official makes the
determination that the installation meets the intent of the code a condition such
as the one listed above may be approved on a case by case basis and for a single
occurrence where the modification will not lessen health, life, and fire safety
requirements. 105.1 PC 2012
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