Commercial Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
January Q&A 2011
General:
1.
(Q) Can egress doors in section 1008.1.3.4 be connected to a back up electrical
supply?
(A) No, the door locks should release on the failure of the primary electrical
power to the building.
2. (Q) What does the 6’ height apply to in section 603 item 8?
(A) Per an interpretation from DOI the 6’ only applies to the wood panels and
similar light frame construction?
3. (Q) In B type units can the exception # 10 in the 2009 ANSI 117.1 section 1004.9 be
used for counter heights?
(A) Yes, the ANSI 117.1 2009 has been adopted by the NC Building Code
Council to be effective Sept. 1st 2011, so it can be used at this time as an
alternate method.
Commercial Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
March Q&A 2011
General:
1.
(Q) How are crematoriums to be treated under the Building Code?
(A) Crematoriums are the same as incinerators and must meet secton 508.2 for
incidental use.
2. (Q) Under section 1210 can vinyl wallpaper be used in restrooms.
(A) Yes, provided that there are no joints within 24” of any fixture and the
manufacture provides data that it meets the requirements non absorbent an it
is installed over moisture resistant gyp board.
3. (Q) If a building is constructed per section 509.2 can the additional story and building
height allowed in section 504.2 be taken?
(A) Yes, section 509.2 refers you to section 503 and no longer to table 503.
4. (Q) Can a dutch door be used as an exit access door from a room or space?
(A) Yes provided that the top and bottom latch together when in the closed
position and open as a single unit from the closed position.
5. (Q) Are elevators required in a charter school 2 or more stories if it is publicly
funded?
(A) Yes
6. (Q) Can the field inspector require exit signs to be added or move even if they are
already shown on the drawings.
(A) Yes, conditions in the field my dictate additional signs or new locations not
shown on the approve drawings.
Commercial Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
February Q&A 2011
General:
1.
(Q) With reinforced masonry walls are inspections required while they are under
construction?
(A) Yes, the inspector should make periodic inspections while the walls are
under construction especially when there are no special inspections. Set the
parameters with the contractor at the start of the job.
2. (Q) What happens toa TCO when the tenant moves out of a space or building?
(A) The TCO is no longer valid and a new one must be obtained for the next
tenant which may also require a ne permit.
3. (Q) Can the Building Inspector make a final inspection and accept a certification
letter on the fire alarm before the Fire Inspector has made his inspection?
(A) Yes.
Building Consistency Meeting
Residential
Date02/09/2011 Recorder and minutes prepared by: Danny Wooten/Lon McSwain
Staff present: On File
Public present: Wayne Carter (J&B Development); Terry Cleary (Meeting Street
Homes); Darrin Price; Greg Seaton (Seaton Builders); Charlie Carter (Remmington
Homes); David Reynolds (BFS); Bob McKee (Ryan Homes); Allan McGee (McGee
Brick); David Kost (True Homes); John Meeks(Appleblossom Energy);
Topics/Subject
Decisions/Conclusions/Actions
Old
Business
None
New
Business
No roof load is allowed on a cantilevered girder in deck construction. Girders
can be set on a notched post in the following conditions. Minimum post size
6”X 6”. If both members of the girder rest on the notched post then 1 ½” of the
post must be maintained to bolt through. If only one member rest on the
notched post then 3 1/2” of the post must be maintained to bolt through.
Can Lights in a
Garage
Sheathing
Inspections.
Sealed Crawl
Bathroom
Ventilation
Section 316.4
Foam
Insulation
Stucco & Reroof
Sill Plate
Deck Footings
Can Lights installed in the ceiling of a garage must be IC rated.
Sheathing inspection is for sheathing only, not the roof. House should
be dryed in. Plans are only required on the site if the house is brick
veneer for bolt on lintels.
A sealed crawl is not a conditioned crawl. The liner is lapped and runs
up the wall with a 3’ gap at the top for termite inspection.
There is a conflict between the Building Code and the Mechanical
Code. Table 403.3 of the Mechanical requires the bathroom to be
mechanically ventilated. Window will not meet the requirement.
There are new ICC compliance reports for foam insulation. They must
be supplied and followed for foam insulation installations. See attached
reports.
When a stucco house is re-roof a new certification letter for the stucco
should be obtained. The required distance between the new roof and the
bottom of the stucco needs to be maintained.
5/4 board is not acceptable to use as a sill plate, it is only 1” thick and
does not provide the nailing depth as a 2X .
Deck blocks are acceptable for deck footings for limited tributary area.
12X12 footing min 4” concrete. Bottom 12” below grade.
Approved By ___Lon Mcswain_________ Date _______02/25/2011_______________
Building Consistency Meeting
Residential
Date01/05/2011 Recorder and minutes prepared by: Danny Wooten/Lon McSwain
Staff present: On File
Public present: Mike Kissel, Jack Glunt, Darrell Fribs, (Standard Pacific Homes);
Wayne Carter (J&B Development); Terry Cleary (Meeting Street Homes); Charles
Sofinowski (M/I Homes); Matthew Klaphcke (L & M Homes);Daniel Blackwelder
(Barefoot & Company);A. Wynn Yates( Yates/Stranes Engineering); Jason
Whitner(Southern Traditional Homes);Bob McKee (Ryan Homes); Allan McGee, Doc
McGee (McGee Brick); Rob Merrill (Griffin Masonry);John Meeks(Appleblossom
Energy);
Topics/Subject
Decisions/Conclusions/Actions
Old
Business
Soil Reports
Footing inspections that fail due to “need subgrade verification form” will have to
produce that form at the next requested inspection. If the next inspection is a poured
concrete wall or slab (concrete work) and the letter is not available this inspection will
be failed as “previous list not complete” but inspection will be performed. If the only
reason to fail that slab or foundation wall is because footers (subgrade form) have not
passed then inspectors will note “pending footer/subgrade letter only, pour at own
risk”. This failure will count against the GC or permit holder and will affect their
defect rate.
New
Business
Code Changes
Effective
01/01/2011
See attached for new Code requirements effective Jan. 1, 2011
R602.6
Load bearing studs cannot be notched in the top or bottom 6” nor can
they be drilled within 6” of another hole or notch. Putting another stud
adjacent and attached in an “L” formation to the notched or drilled stud
would be an acceptable fix.
Mechanical rooms that are supplied with outside air must be insulated
so that they are outside the buildings thermal envelope. Make sure that
if they are located above conditioned space that the floor/ceiling space
below is insulated also.
Doors that swing out (other than an exterior storm or screen) cannot
swing over steps or stairs, there must be a landing provided.
The 2012 Residential code passed with the option of sprinklers in
townhouses to reduce the 2 hr. wall to 1 hr. Chapter 11 passed with a
total reduction of energy use of 15% not the 30% as submitted. Trade
offs for the energy requirements will be heard at the March meeting.
See attached guide for cold weather protection.
Chapter 11
Section
R311.4.3
December
NCBCC
Meeting.
Cold Weather
Concrete.
Approved By ___Lon Mcswain_________ Date _______01/28/2011_______________
Residential code Changes effective Jan 1st, 2011
Building Consistency Meeting
Residential
Date03/02 /2011 Recorder and minutes prepared by: Danny Wooten/Lon McSwain
Staff present: On File
Public present: Wayne Carter (J&B Development);Charlie Sofinowski (M/I
Homes);Bill Green (Barefoot & Co);Toby Brundage, Joe Stewart (Builders 1st
Source); Bob McKee (Ryan Homes);Doc McGee, Allan McGee (McGee
Brick);Matthew Klapheke (L&M Construction); David Schwieman(DR Schwieman,
Inc); Darren Price;Daniel McBride (Cunnane Group);Dave Reynolds (BSF);Jason
Whitener (Southern Tradition Homes);Bob McKee (Ryan Homes);
Topics/Subject
Decisions/Conclusions/Actions
Old
Business
None
New
Business
Section
R408.1.2
Foundation vent wells are required when the bottom of the vent is located less
than 4” above finish exterior grade. Vent wells would not be required if the
grade under the vent is concrete and is sloped so that water will not run into
the vent.
Mud mats
Mud mats cannot be poured until the an inspection has been made on
the sub grade.
Senate Bill 22 has passed the Senate And the House. Once it is signed
by the Governor it becomes law. This law may prevent the adoption of
the 2012 Residential Code, the 2012 Energy Code and the 2012
Electrical Code.
Foundations cannot be backfilled until a foundation inspection has been
made.
Carbon Monoxide detectors are required to be installed in all new
residential construction, in existing dwellings where interior alterations,
repairs fuel-fired appliance replacement or additions requiring a permit
occurs, or where one or more sleeping rooms are added or created.
Effective January 1, 2011
Senate Bill 22
Foundations
Carbon
Monoxide
Detectors
Approved By ___Lon Mcswain_________ Date _______03/31/2011_______________
MECKLENBURG COUNTY
Land Use and Environmental Service Agency
Code Enforcement
2/9/11 ELECTRICAL CONSISTENCY MEETING
Code Consistency Questions
1. I have a 500 KVA generator, with no overcurrent protection at the generator, and it’s
feeding a trough. Off this trough I am feeding two 200 Amp disconnecting means. 1) How do
is size the conductors to the trough? 2) How do I size the conductors to my disconnects?
See 445.13 and 19. 445.19 (2) first of all allows a generator to feed individual enclosures
tapped from a single feeder for load separation and distribution. 1) 445.13 says if those feeder
conductors to the trough don’t have overcurrent protection ahead of them, they shall be sized
to carry 115% of the generator nameplate current rating. 2) We would then size the
conductors to the disconnects per the appropriate tap rule found in 240.21 and load
calculations per article 220.
2. Is a disconnect required within sight of a range hood controller?
Yes – No - Maybe. 422.31 & 422.32 Exception & 422.34 (D).
If the motor is 1/8 hp or less and 300 VA or less; the answer is no. (422.31(A))
If the motor is over 1/8 hp and there is no unit switch, then yes, there must be a disconnect
within sight of the controller. (422.32)
If the motor is over 1/8 hp and there is a unit switch, then the disconnect is permitted to be
out of sight from the controller. (422.31(B) & 422.34(A-D))
NOTE: A unit switch(es) with a marked-off position that is a part of an appliance and
disconnects all ungrounded conductors shall be permitted as the disconnecting means
required by this article where other means for disconnection are provided in occupancies
specified in 422.34(A) through (D).
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3. I have a lug that is attached to the meter can (not to the neutral bar which is also
attached to the can). Am I allowed to attach the grounding electrode conductor to this lug.
(see attached picture)
No. 200.2(B) states “The continuity of a grounded conductor shall not depend on a connection
to a metallic enclosure, raceway, or cable armor.”
4. In a 120/240-volt 3-phase, 4 wire, delta-connected panelboard, are straight voltage rated
2-pole breakers (240-volts) required only when one pole is connected to the high leg (“B”
phase); and are slash-rated 2-pole breakers (120/240-volts) permitted where connected to
the “A” & “C” phases?
See 240.85 that states, “A circuit breaker with a straight voltage rating, such as 240V or 480V,
shall be permitted to be applied in a circuit in which the nominal voltage between any two
conductors does not exceed the circuit breaker’s voltage rating. A circuit breaker with a slash
rating, such as 120/240V shall be permitted to be applied in a solidly grounded circuit where
the nominal voltage of any conductor to ground does not exceed the lower of the two values
of the circuit breaker’s voltage rating and the nominal voltage between any two conductors
does not exceed the higher value of the circuit breaker’s voltage rating. Therefore, a 240-volt
circuit breaker can be connected between any two phases of a 120/240-volt, 3-phase
panelboard supplied by a 120/240-volt delta 3-phase system. A 120/240-volt rated circuit
breaker may service 120-volt line-to-ground circuits and/or 240-volt line-to-line circuits. A
slash rated 120/240-volt circuit breaker may not be applied on a 208-volt line-to-ground
circuit. There is no NEC prohibition in connecting a 2-pole, 120/240-volt rated circuit breaker
between A and B or between B and C phases where the nominal voltage of any conductor to
ground does not exceed the lower of the two values of the circuit breaker’s voltage rating and
the nominal voltage between any two conductors does not exceed the higher value of the
circuit breaker’s voltage rating. The UL panelboard marking guide states, “Some circuit
breakers, like single-pole breakers for use with handle ties rated 120/240 colts, should not be
connected to the phase that is 20-volts to ground. Also the UL panelboard marking guide
goes on to state, “Generally, the B-phase is used only in conjunction with either the A- or Cphase for a 240 single-phase branch circuit or with both the A- and C-phase for a three-phase
branch circuit. Circuit breakers or cartridge fuses rated for straight 240 volt systems are
suitable for this use.”
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5. Is a bonding jumper required around a water meter when the grounding electrode
conductor is connected to the street side of the water meter?
Maybe, see 250.53(D)(1) that states, “Continuity of the grounding path or the bonding
connection to interior piping shall not rely on water meters or filtering devices and similar
equipment.” If the street side of the meter has a metal water pipe that is in direct contact
with the earth for 3.0 m (10 ft) or more and the grounding electrode conductor is connected
to that pipe on the street side of a water meter, then that pipe is adequate as a metal
underground water pipe electrode per 250.52(A)(1). However, the interior portion of the
metallic water piping system on the house side of the water meter cannot benefit from that
sole connection on the street side of the water meter, therefore either a bonding jumper
needs to be installed around the water meter to provide continuity of the metal water piping
system or a separate bonding conductor per 250.104(A) will be required to be installed to the
interior water piping system that is on the house side of the water meter. See 250.104(A)(1)
that states, “Metal water piping system(s) installed in or attached to a building or structure
shall 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. The bonding jumper(s) shall be sized in accordance with Table 250.66 except
as permitted in 250.104(A)(2) and (A)(3).”
6. Is the 10 AWG DC grounded conductor of a PV system required to have a white outer
finish or can it being re-indentified?
In accordance with 200.6(A), grounded conductors that are smaller than 6 AWG and used in
PV source circuits are permitted to be marked at the time of installation with a white marking
at all terminations. Also see 200.6(A)(2) that states “A single-conductor, sunlight-resistant,
outdoor-rated cable used as a grounded conductor in photovoltaic power systems as
permitted by 690.31 shall be identified at the time of installation by distinctive white marking
at all terminations. See also 200.6(B) and 690.13.
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7. I have a 5000 amp feeder with 12 parallel runs of 600 kcmil THHN copper ungrounded
conductors installed in 12- 4" PVC conduits. What is the minimum size copper equipment
grounding conductor required in each conduit? 600 kcmil or 700 kcmil?
For a 5000 ampere overcurrent device Table 250.122 shows a 700 kcmil. While this might
seem to qualify for the allowance in 250.122(A) where the EGC is not required to be larger
than the phase conductor, it does not apply to these conductors that are in parallel. This EGC
sizing requirement is in place because the majority of the ground fault current could be
supplied by all the phase conductors but be returned to ground by only one EGC.
8. Can you explain why the DC conductors for PV systems are sized by multiplying 125%
twice?
Section 690.8(A) requires the photovoltaic source circuit maximum current to be the sum of
parallel module rated short circuit currents multiplied by 125% (these are maximum short
circuit currents). Section 690.8(B)(1) requires the dc circuit conductors and any overcurrent
protective devices to be sized to carry the maximum short circuit currents figured at 125% in
690.8(A) plus an additional 125% for continuous use or a total of 156%. This 156% will
ensure the conductors are large enough to handle both normal current plus the additional
fault current at the point of fault from both the array at the fault site and any that are in
parallel with the array. 690.8(B)(2) Overcurrent protection for photovoltaic output circuits
with devices that will internally limit the amount of current from the photovoltaic output
circuits (for example, where fuses are built into the system) are permitted to be rated less
than 156%. These overcurrent protective devices can be rated at least at 125% of the limited
current value. The conductors must still be rated at 156%. 690. 8(D) Where a single
overcurrent device is used to protect a set of two or more parallel connected module circuits,
the ampacity of each of the module interconnection conductors shall not be less than the sum
of the rating of the single fuse plus 125% of the short-circuit current from the other parallel
connected modules.
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9. Is a disconnect mandatory both inside and outside for a mini-split system?
Yes-No-Maybe . 424.19 There are so many different makers and combinations of make-ups of
these systems that no one answer will cover them all. You will have to look at the installation
instructions first and then apply the proper Code section. It should be noted, however, that in
some cases it is allowable for the breaker in the panel to serve as the disconnect for these
units per 424.19.
10. There is a GFCI protected 125 volt 15 amp receptacle outlet installed on the front porch
of a single dwelling. I have to step up onto the porch slab 4 inches from grade to access the
receptacle. Can this receptacle be recognized as the required outside receptacle on the front
of the dwelling unit?
As the question is written, no. See 210.52(E) that states “For a one-family dwelling and each
unit of a two-family dwelling that is at grade level, at least one receptacle outlet accessible
while standing at grade level and located not more than 2.0 m (6½ ft) above grade shall be
installed at the front and back of the dwelling.” NEC 210.52(E)(3) requires a receptacle outlet
within the parameter of the porch . A receptacle can be located to meet both of these
requirements.
11. For a 240V to 208Y/120V transformer, is it better to bond the neutral to the metal frame
at the transformer itself, at the panel, or at both locations?
Better to bond at the source. There are three exceptions and one may bond the neutral at
either point as long as the neutral does not carry parallel current. See 250.30(A)(1) that
states “This connection shall be made at any single point on the separately derived system
from the source to the first system disconnecting means or overcurrent device, or it shall be
made at the source of a separately derived system that has no disconnecting means or
overcurrent devices.” Also see Exception No. 2 that states “A system bonding jumper at both
the source and the first disconnecting means shall be permitted where doing so does not
establish a parallel path for the grounded conductor. Where a grounded conductor is used in
this manner, it shall not be smaller than the size specified for the system bonding jumper but
shall not be required to be larger than the ungrounded conductor(s). For the purposes of this
exception, connection through the earth shall not be considered as providing a parallel path.”
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12. I was recently turned down by an inspector for using HCF MC cable to wire recessed and
lay-in fixtures in a hospital. I understand that non-flexible raceways are required for
emergency system wiring; but does that include whips for light fixtures, headboards, custom
office furniture and other items that are difficult to connect as well?
See 517.30 (C) (3) 3 d. After consulting with DOI and other enforcement entities, the
consensus was that lay-in fixtures (luminaires) ARE considered “necessary for flexible
connection to equipment” and thus they, along with the other equipment mentioned above,
are permitted to be installed with listed flexible metal raceways and listed metal sheathed
cable assemblies; not because they are difficult to connect but because of the need for
flexibility after connection.
PEOPLE ● PRIDE ● PROGRESS ● PARTNERSHIPS
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MECKLENBURG COUNTY
Land Use and Environmental Service Agency
Code Enforcement
1/12/11 ELECTRICAL CONSISTENCY MEETING
The January Consistency Meeting was cancelled due to Office Closing for snow.
PEOPLE ● PRIDE ● PROGRESS ● PARTNERSHIPS
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MECKLENBURG COUNTY
Land Use and Environmental Service Agency
Code Enforcement
3/9/11 ELECTRICAL CONSISTENCY MEETING
Code Consistency Questions
1. Do all low voltage devices have to be installed to approve a final?
Yes, No, and Maybe. There are so many varieties of low voltage installations that are going to
be installed at so many different stages of construction that it is not feasible to say that ALL
low voltage devices must be installed at the final inspection. The following is a guide to what
is required:
 All code required low voltage systems must have devices and system fully
installed.
 All systems or portions of systems that will be energized when power is turned
on must have that system or portions fully installed
 All systems that have wiring un-terminated and for future use, must have that
wiring protected and tagged for” future use.”
 All components that require grounding must be grounded per code.
 All installed components, devices, etc shall be labeled and listed
2. What is required for an Industrial Machinery exemption?
First you must become completely familiar with the Department Directive on Industrial
Machinery found on our website at:
http://www.charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Inspections/trades/
Electrical/Documents/IMandFAQ.pdf
Next a Declaration Letter described in the Directive must be submitted by the owner or officer
of the business to the authority having jurisdiction and / or the inspector on the job for review
and documentation. Finally the inspector will evaluate the machinery at the installation to see
if it meets the intent of GS 143-138(b), and if so, inspect the job accordingly.
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3. When does work have to be brought up to current code?
This is an issue that for the most part has to be evaluated on a case-by-case basis; in
general all work must meet the current code. Some specific replacement/repair work
guidelines such as flood & fire damage, remodel jobs, kitchen cabinet replacement and
existing bathroom remodels can be found in the Electrical Interpretation page of our
website as follows:
http://www.charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/
CodeInterpretations/Pages/ElectricalInterpretations.aspx
4. The central vacuum system installer installed a bunch of their suction outlets
onto existing electrical receptacle outlets. In some cases these existing outlets
are 20 amp wire and breakers. The wire that comes from the assembly is a five
foot length #14 AWG. He says UL allows this as the devices are listed. Is
this correct?
No. the items are a recognized component, not a “listed system”. UL
White Book DMLW NEC 422.15(A) which references 210.23(A) and also
422.15(B) which states that the conductors cannot be less in size than the
conductors they connect to.
5. I have a 3,000 amp service and two 2,000 amp services in the same room. The water
main is located 400 feet away. A designer insists that I install either three separate 3/0 AWG
copper grounding electrode conductors or two 300 kcmil conductors in parallel. May I run a
single 3/0 AWG copper wire from a bus bar (1/4” x 2” x 12”) that is in the room containing
these services to the water main to serve as the ground for all the services and connect each
service to this bus bar?
Yes, A common grounding electrode is acceptable. The 250.64(a) thru (F) of the
2008 NEC makes it clear that a common GEC must be a 3/0 cu conductor. While all three
services could fail, they would not all fail at the same instance. The grounding electrode
connection is not there to open an overcurrent device and when you look at an installation if
there are just made (rod) type electrodes
a #6 is the maximum size required. A separate grounding electrode conductor shall be run
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from each electrical service to a grounding electrode or a common grounding electrode
conductor. 250.58 requires the same electrode(s) be used as the common tie point for all
services. 250.64(F) allows the installer to use a bus bar for connecting “(B) bonding jumpers
from grounding electrodes “if there are more than one. Typically each service may be
connected with a properly sized EGC to the closest steel framing member and the steel frame
is grounded properly per 250.52(A) (2).
6. There have been several questions regarding CSST bonding come up, We need some
clarification. Do we require # 6 per mechanical code or do we require bond per CSST
installation instructions?
Yes. 310.2 CSST Bonding of the Fuel Gas Code states: CSST Gas piping systems shall be
bonded to the electrical service grounding electrode system at the point where the gas service
enters the building. The bonding jumper shall not be smaller than 6 AWG copper wire or
equivalent. If the manufacturer’s instructions call for a size larger than #6, then it must be
used, otherwise we use 310.2
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Land Use and Environmental Service Agency
(Code Enforcement)
Attention:  Denotes a new question!
 Denotes a revised/revisited question.
Quarter
NC Fuel Gas Code 2011
March 2011
Table of Contents
Chapter 1 Administration
Chapter 3 General Regulations
Chapter 5 Chimneys & Vents
Chapter 7 Gaseous Hydrogen S.
POLICY
0
0
0
0
0
Chapter 2 Definitions
Chapter 4 Gas Piping Install.
Chapter 6 Specific Appliances.
Chapter 8 Ind./Special Waste
OTHER
2
0
0
0
0
Chapter 4 Gas Piping Installation:
1)
(Q) When and where are sediment traps required?
(A) Section 408 requires a sediment trap as close as practical to the inlet side
of the equipment. This would include gas regulators. Regulators for
individual appliances may utilize a single trap for both the regulator as well
as the appliance. Illuminating appliances, ranges, clothes dryers, gas logs, log
lighters and outdoor grills are exempt from traps.
2)
(Q) May a flexible gas connector run through the appliance housing?
(A) No! Per section 411.1.3.3
1)  (Q) I am terminating a direct vent appliance on the exterior wall of a residential
building. The fireplace I am venting is on the same wall as the porch. The porch
is open on three sides and the termination cap provides adequate protection for
the vent opening. Am I allowed to install this per code?
(A) Yes. A venting system shall be designed and constructed so as to
develop a positive flow adequate to convey flue or vent gases to the outdoor
atmosphere. Once a deck is completely covered and/or screened in, it now
could be an occupied space and would no longer be considered outdoors. We
have to depend on the field Inspector to make an informed judgment. There
are special circumstances where this would be allowed. If the
manufacturer’s instructions allow the installation on an open porch (3 sides)
and the termination vent is protected the installation may be allowed.
Ref: 503.3
1st
Chapter 5 Chimneys and Vents:
NC Fuel Gas Code 2011
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1)
 (Q) I want to install code approved unvented gas logs in a commercial
restaurant that seats 100 people. Can this appliance be installed in an assembly
occupancy?
No. Unvented room heaters shall not be installed within Groups A, E, and I
Occupancies. Ref: (FGC) 621.4
2)
 (Q) A new 5 million BTUH instantaneous water heater is being installed in an
existing food processing plant. The water heater is located in an existing pump
room that also contains electrical panels. The pump room area is 1000 square
feet. Combustion and ventilation air openings are installed high and low and
meet code sizing requirements.
a. Does the pump room have to comply with the boiler room requirements of [B]
1015.3 for egress?
(A) Yes. At 15.1 Boiler Horse Power it will require two remote exit doors per
the building code.
b. What is the BTUH conversion factor for BTUH to Boiler Horse Power?
(A) One boiler horse power equal 330,000 BTUH.
c. Are there other factors or trade requirements that may be effected by the
installation of the boiler in the pump room?
(A) Inspectors should be aware of clearance to combustibles. Ref: (FGC)
631.3.
.
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Chapter 6 Specific Appliances :
NC Fuel Gas Code 2011
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March 2011
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NC Mechanical Code 2011
March 2011
Table of Contents
Chapter 1 Administration
Chapter 3 General Regulations
Chapter 5 Exhaust Systems
Chapter 7 Combustion Air
Chapter 9 Specific Appliances
Chapter 11 Refrigeration
Chapter 13 Fuel Oil Piping
POLICY
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Chapter 2 Definitions
Chapter 4 Ventilation.
Chapter 6 Duct Systems
Chapter 8 Chimneys & Vents
Chapter 10 Boilers, Water Htrs
Chapter 12 Hydronic Piping
Chapter 14 Solar Systems
OTHER
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Chapter 3 General Requirements:
(Q) What are the requirements for systems installed in a flood plain?
(A) Section 301.13 states:
301.13 Flood hazard. For structures located in flood hazard areas, mechanical
systems, equipment and appliances shall be located at or above the design flood
elevation. Exception: Mechanical systems, equipment and appliances are permitted
to be located below the design flood elevation provided that they are designed and
installed to prevent water from entering or accumulating within the components
and to resist hydrostatic and hydrodynamic loads and stresses, including the
effects of buoyancy, during the occurrence of flooding to the design flood elevation
in compliance with the flood-resistant construction requirements of the
International Building Code.
301.13.1 High-velocity wave action. In flood hazard areas subject to high-velocity
wave action, mechanical systems and equipment shall not be mounted on or
penetrate walls intended to break away under flood loads.
See section 602.4 for similar the requirements covering the duct system.
2)
(Q) Would the discharge line of an appliance condensate pump need to be protected
from freezing temperatures?
(A) Chapter 307 does not address the protection of condensate discharge lines
Installed areas subject to freezing temperatures however we would be remiss if
we did not require this protection in areas such as a ventilated attic space. Other
areas of concern would be where the line exits the foundation wall. We would
“recommend” that these installations be sloped downward and increased in pipe
size to limit blockages.
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NC Mechanical Code 2011
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(Q) What type of access would be required on a boiler installation where the device
may be subject to vandalism or component theft?
(A) Chapter 306 covers the typical installation of equipment. Section 105.1
Would allow us the flexibility to allow alternative access on a case by case basis.
Chapter 4 Ventilation:
1)
(Q) What is the minimum ventilation required for toilet rooms?
(A) Toilet rooms are not considered to be habitable space and so their
ventilation requirements would be found in table 403.3 which would require
mechanical exhaust and not natural ventilation.
Note:
We have allowed natural ventilation in the past and we will begin enforcing the
mechanical ventilation requirement on permits obtained after April 1, 2011.
1)
(Q) Does Mecklenburg County allow an alternative method for type I hood
clearances?
(A) Mecklenburg County allows the use of NFPA 96 , Chapter 4.2.3.2 based
on an interpretation by DOI dated 2/2/2004.
2)
(Q) In an automotive repair garage with a vehicle exhaust source capture system
per NCMC 502.14, is it permitted to have one (1) –exhaust capture connection
for every two (2) bays or is one connection only allowed per bay?
(A) The Mechanical Code is silent on this question, however the code language
gives the inference that it requires a singular; “a source capture system”
for each vehicle or service bay. One per bay is required. Ref: 502.14
3) 
(Q) Even though the code requirements have been met for the installation of the
grease duct the contractor wants to add several more cleanout openings because he
also has the maintenance contract on the grease duct system. The duct is only 10
inches by 10 inches and the code access door manufacturer informs him the
smallest door approved for grease duct installation per code is 12 inches by 12
inches. Can the contractor make his own door to access the grease duct?
(A) Yes. Where the duct is smaller than the 12 by 12 minimum the mechanical
contractor may provide cleanouts approved by the mechanical official at least
equivalent to the minimum requirements of the code for manufactured access
doors. Ref: 506.3.9
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Chapter 5 Exhaust Systems:
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NC Mechanical Code 2011
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Chapter 6 Duct Systems:
2) 
(Q) What method can be used to protect the opening in a floor/ceiling or
roof/ceiling assembly where supply duct from the HVAC unit penetrates
the assembly? NOTE: There is not a fire damper currently manufactured that
is approved for this application when the multi-story building is classified as an
R2 occupancy with type V construction.
(A) The current code approval for this application requires a smoke detector
to be installed in the same room as the HVAC unit that will shut down the unit
if smoke is detected. The smoke detector shall tie in to the smoke detector
circuit provided for the apt/condo unit. A static damper is required at the
ceiling penetration of the HVAC duct penetrations from the unit. This method
of protecting the ceiling penetrations is only approved until a Fire Damper is
manufactured that provides adequate protection for the openings.
(Q) What are the minimum requirements for plenum rated materials within an
open air plenum space?
(A) Not required. See plenum definition. Open air returns are typically in
habitable areas and do not have to conform to the material requirements of
enclosed plenums.
Example: Home Depot. Ref: Chapter 2 plenum definition. & 602.2.1
Policy: Includes Energy Conservation and Re-Hab Codes
1)
(Q) When is a refrigeration permit required?
(A) A refrigeration permit is required for any refrigeration equipment needing
to be assembled (excluding the walk-in cooler box) OR any equipment needing
to be hard wired electrically (not plug type).
2) 
(Q) Is the outside air make-up air duct located on the non-insulated side of an
attic in a single family dwelling required to be insulated?
(A) No. The temperature difference between the air in the make-up air duct
and the air temperature in the attic are not sufficient to cause condensate
that would require insulating the duct.
Ref: 503.2.7, Exception #2, North Carolina Energy Conservation Code
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(Q) When does a Mechanical Inspector enforce the Carbon Monoxide Alarm
requirements adopted by the NC Department of Insurance in
One-and-Two-Family Dwellings and Townhouses? Effective date:
January 1, 2011
(A ) 2009 NC Residential Code revisions to Section R313 as provided below:
R313.1.2 Where required-existing dwellings. In existing dwellings, where
interior alterations, repairs, fuel-fired appliance replacements, or additions
requiring a permit occurs, or where one or more sleeping rooms are added or
created, carbon monoxide alarms shall be provided in accordance with
Section 313.1.1.
R313.1.3 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
UL 2034 and shall be installed in accordance with this code and the
manufacturer’s installation instructions.
4) 
(Q) Can R-4 insulated Flex be used in Icynene insulated attics where a thermal
Barrier is above the ductwork?
(A) Yes. It can be used as long as the attic is now part of the thermal envelope
and properly sealed. Ref: 503.2.7, NC Energy Conservation Code
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R313.1.1 Carbon Monoxide alarms. In new construction, dwelling units shall be
provided with an approved carbon monoxide alarm installed outside of each
separate sleeping area in the immediate vicinity of the bedroom(s) as directed
by the alarm manufacturer.
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NC Plumbing Code 2011
March 2011
Table of Contents
Chapter 1 Administration
Chapter 3 General Regulations
Chapter 5 Water Heaters
Chapter 7 Sanitary Drainage
Chapter 9 Vents
Chapter 11 Storm Drainage
POLICY
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Chapter 2 Definitions
Chapter 4 Fixtures, Fau & Fit.
Chapter 6 Water Supply & Dist.
Chapter 8 Ind./Special Waste
Chapter 10 Traps, Inter. & Sep.
Appendix A-H
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Chapter 3 General Regulations:
1)
(Q) Is a check valve required on the water supply to a mobile home?
No. Water supply piping shall be directly connected to the mobile home.
The utility requirements are the same as any single family dwelling
in Mecklenburg County.
Ref: 301.3, 301.4 & North Carolina Mobile Home Code requirements.
1)
(Q) What is the maximum height of the curb on a shower pan threshold?
(A) There is not a maximum height for a non-handicap shower threshold.
The requirement is; “the remaining side (threshold) shall wrap over the
curb”.
Ref: 417.4
(B) The maximum height for the threshold of a handicap shower, (either rollin or transfer type) is ½ inch. The exception is for existing facilities where
structural reinforcement would be disturbed. If that is the case a
maximum threshold of 2 inches would be allowed.
Ref: ICC/ANSI A117.1- 2003
2)
(Q) Can standard drywall coverings be used on the walls of a shower enclosure
with shower head?
(A) No. The wall area shall be constructed of smooth, non-corrosive, nonabsorbent, and water proof materials to a height of 6 feet.
Ref: 417.4.1
3) 
(Q) I have an old existing apartment building three stories high that have no
washer and dryer facilities. I can alter the plumbing piping to provide a 2
inch drain for the washers. I have no practical way to install a horizontal 3
inch drain for the washers. Will the re-hab code offer me any relief so these
1st
Chapter 4 Fixturers, Faucets and Fixture Fittings:
NC Plumbing Code 2011
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March 2011
washers may be installed?
(A) No. The Re-hab code offers the designer no relief from the horizontal 3
Inch drain requirement, however, the plumbing official may look at the
existing DWV system to determine the feasibility of accommodating the
washers before making a final determination. Ref: 406.3
4) 
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(Q) Is a drain required for an outside shower used on a pool deck that has only
a cold water connection?
(A) No. The shower is not used for bathing and has no hot water
connection. The water could be considered clear water waste under
normal circumstances and can drain into the same system that is used for
the pool deck drainage. Similar in some respects to Emergency Showers
and Eyewash Stations.
Ref: 411
Chapter 5 Water Heaters:
(Q) may a plastic safety pan be used for a gas fired instantaneous W/H?
(A) Yes, provided that the water heaters minimum distance from
combustible material is maintained. Ref: Manufacturers Instructions
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1)
2) 
(Q) What is the minimum size of a water heater pan drain per the current North
Carolina Plumbing Code?
(A) The plumbing code minimum in 504.7.1 requires a ¾ inch drain minimum
This is incorrect and is a misprint in the code. The correct minimum size is 1
Inch. See DOI letter From Henry Webster Chief Plumbing Engineer for the
State Department of Insurance Office of the State Fire Marshall.
Chapter 6 Water Supply & Distribution:
1)
(Q) What is the maximum distance a fixture supply pipe may be from the fixture it
serves?
(A) Section 604.5 states 72”.
2)
(Q) When are water hammer arrestors required?
(A) 604.9 Water hammer. The flow velocity of the water distribution system
shall be controlled to reduce the possibility of water hammer. A water-
NC Plumbing Code 2011
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March 2011
hammer arrestor shall be installed where quick-closing valves (clothes
washers and dishwashers) and metallic piping is used. The water-hammer
arrestor shall not be required on any valves where plastic piping is used for
water distribution. Water-hammer arrestors shall be installed in accordance
with the manufacturer’s specifications. Water-hammer arrestors shall
conform to ASSE 1010.
3)
(Q) Does the Code require a water distribution system to be sanitized?
(A) ? (No) 602.3.4 purged and disinfected, 610.1 purged of deleterious matter.
4) 
(Q) Is an expansion device required on a tankless water heater?
(A) No. An expansion device is required only if there is a tank type water
heater installed in the residence. An expansion device is not required if hot
water distribution is from a tankless water heater. Ref: 607.3
Chapter 8 Indirect/Special Waste:
1)
(Q) What is a sacristy and what special allowances apply?
(A) It is one use where the drain is allowed to discharge directly into a
drywell outside of the structure.
2)
(Q) Can the tail piece of a lavatory or sink be used as a direct connection for
the drainage from an ice maker or medical equipment?
No. An air gap shall be provided and the waste shall discharge into an
approved receptor to protect against backflow.
Ref: Section 801.2, 802.1, and 802.1.6
3) 
(Q) Do all acid waste neutralization tanks require a monitoring device with
alarm?
(A) Yes. We require monitoring and alarms on all neutralization tanks
installed in Mecklenburg County. Ref: Code Interpretation Letter &
702.5/803.2,803.5.
4)  (Q) Can the discharge from a three compartment sink in a commercial
Restaurant be pumped to an indirect waste receptor in a remote location?
(A) Yes. The three compartment sink shall discharge through a flow control
fitting and a point of use grease interceptor before terminating in the lift
station. The lift station pumped discharge shall have a check valve and
terminate over an indirect waste receptor which must be visible from the
three compartment sink location. Ref: 802.1.1, 802.2.1
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Chapter 10 Traps, Interceptors & Seperators:
1)
(Q) What is required for laundry drain protection for lint, buttons or strings? 1st
(A) Laundries other than a single family residence, shall be equipped with a
manufactured device (not field fabricated) that will limit lint, buttons or
string larger than ½” from entering the drainage system.
2)
(Q) Is a separate draw off storage tank allowed to be installed as part of an
oil/water separator installation?
Yes. When circumstances exist on a site that would not permit the full
storage tank capacity calculated for an integral storage oil/water separator to
be installed, an integral separator sized to meet the minimum capacity of the
code may be installed with an additional draw off tank to store the remaining
capacity calculated for the separator. All other requirements for oil/water
separators installed in Mecklenburg County shall remain the same.
Ref: 1003.1, 1003.2, 1003.4, & 1003.4.2
1)
(Q) How do vertical walls affect roof drain calculations?
(A) 1106.4 Vertical walls. In sizing roof drains and storm drainage piping,
one-half of the area of any vertical wall that diverts rainwater to the roof
shall be added to the projected roof area for inclusion in calculating the
required size of vertical conductors, leaders and horizontal storm drainage
piping.
2) 
(Q) I am attaching a handmade metal box I designed to a 4 inch overflow roof
drain that terminates on the side wall of an apartment building. I am installing a
screen in the box to restrict the flow so the water will not be pouring down the
side of the building and staining the brick finish. Does this installation meet the
code?
No. The size of the drainage pipe is reduced in the direction of flow. The
fitting is not approved and retards the direction of flow. The fitting has
shoulders and/or reductions that retard flow. Strainers are allowed on roof
surfaces only for overflow drains this is a side wall mounted fitting.
Ref: 1101.5, 1101.6, 1102.7, 1105.1, 1107.2
1st
Chapter 11 Storm Drainage:
NC Plumbing Code 2011
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1)
(Q) What is the maximum depth that a two-way C/O may be installed?
(A) The maximum depth shall not exceed 24” below grade. If deeper depths
are required, then an additional combination may be placed as close as
possible downstream of the required building drain/sewer junction C/O.
2) 
(Q) A single family home is connected to a septic tank. Can a dishwasher or
washing machine be connected to the drainage system of the house? Can the
washing machine be connected to a dry well?
(A)The homeowner would be required to contact the Environmental Health
Department for Mecklenburg County. They regulate the installation, repair,
and alteration of the septic tank systems in Mecklenburg County.
1st
Policy:
NC Plumbing Code 2011
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March 2011
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MECKLENBURG COUNTY
Land Use and Environmental Services Agency
Code Enforcement
Memo
Date:
April 19, 2011
TO:
From:
RE:
All Contractors
Jim Bartl
Code Compliance Report
For over fourteen years, the Department has collected data on inspection failures, based on a
system of defect codes, which are recorded at the time of inspection. Those reports are
summarized for presentation to the Building Development Commission on a quarterly basis.
Attached is a copy of the most recent Code Compliance Report Data Summary for the period
January 1, 2011 to March 31, 2011. This report highlights the most frequent code defects sighted
in each of the trades.
Since July 1, 2001, detailed contractor code defect data has been available on the Department web
site (go to the contractor’s tool box at www.meckpermit.com). Questions on the data may be
directed to Kathleen Batey: kathleen.batey@mecklenburgcountync.gov , (704-336-3545) or your
project specific Code Enforcement Manager.
Prior to July 1, 2002, we also held hard copies of individual contractor defect reports at the
Building Development Center front desk for contractor pickup. Given the huge amount of paper
involved, and the fact that the vast majority of these reports were not picked up, this service was
discontinued. However, Hal Marshal administrative support staff will provide assistance to
contractors on downloading their reports over the counter or by phone (call Documents 704-3363830).
PEOPLE • PRIDE • PROGRESS • PARTNERSHIPS
700 North Tryon Street • Charlotte, North Carolina • Fax (704) 336-3839
www.meckpermit.com