Commercial Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
August Q&A 2011
General:
1.
(Q) Does exception 2 in section 1015.2 apply to an occupied roof?
(A) Yes, even though the roof is not sprinklered, the building is fully sprinklered
and therefore 1/3 the diagonal between exits would still apply.
2. (Q) Does the 400 feet of travel distance in section 1016.2 apply if an ESFR sprinkler
system is installed and the smoke an heat vents removed?
(A) No, the commentary clearly states that the sprinkler system and the smoke
and heat vents must work together to get the 400 feet of travel distance.
3. (Q) Which code is to be used in conjunction with section 421to meet the requirements
of these occupancies.
(A) Either the requirements for R-3 occupancy out of the Building Code or the
Residential Building Code may be used.
4. (Q) What does section 2605.2 item 3mean?
(A) On the exterior of a building no single piece of plastic shall be greater than
300 sq. ft. in area and shall be separated vertically by 4’-0” and horizontally
by at least a noncombustible mullion.
5. (Q) Is a toilet room required to be separated from a rated corridor?
(A) No if the following conditions are met. 1) The toilet is separated from the
rest of the building with walls constructed as corridor walls. 2) No other
rooms open off the toilet room. 3) The room contains no gas or electrical
appliances ( except electric hand dryers). 4) The room is not used for any
other purpose than for which it was designed.
Commercial Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
September Q&A 2011
General:
1.
(Q) Is accessible seating required at a bar?
(A) Per Barry Gupton with DOI, if accessible seating is provided in the bar area
(same room) then the bar need not be accessible.
2. (Q) Is the nosing marking required by ANSI 117.1 section 504.5 still required if there
is a ramp adjacent to it?
(A) Yes
3. (Q) When is two way communication required at an exterior are for assisted rescue?
(A) Where the area is located as not to be immediately visible, as the rear of a
warehouse then two way communications is required.
Commercial Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
July Q&A 2011
General:
1.
(Q) When ca an owner or tenet move stock or other materials into a building or
space?
(A) Nothing belonging to an owner or tenet may be moved into a building or
space until a TCO or Co has been issued.
2. (Q) Are signs required to be permitted?
(A) Appendix H is adopted and is part of this code. Any signs required to be
permitted by Appendix H requires a permit.
Residential Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
August Q&A 2011
General:
1.
(Q) Is a permit and inspections required to replace a fence/barrier around a pool?
(A) Per DOI the answer is yes. The fence /barrier would have to meet the
requirements of Appendix G
2. (Q) Are screened porches required to be built from treated lumber?
(A) Yes, Section R319.1 item 8 requires that all structural elements below the
header be of treated lumber. An alternate method of protection from weather
and decay may be accepted on a case by case bases.
3. (Q) Are all smoke detectors required to be hard wired?
(A) No, in renovations to an existing dwelling the smoke detectors are only
required to be hard wired if wall and ceiling coverings are removed.
4. (Q) What is a sleeping room?
(A) Per Chapter 2 it is a room designated on the plans as a sleeping. Room. If
there are no plans and the room contains a closet it will be considered a
sleeping room.
5. (Q) When is a permit required for re –roofing?
(A) If the cost of the job exceeds $5,000.00 or a different type of roofing is
being installed then a permit is required.
Residential Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
September Q&A 2011
General:
1.
(Q) How is an accessory building to be measured?
(A) The foot print shall be measured at the exterior walls excluding the
overhang. The height shall b measured from grade to the mean roof height.
2. (Q) Where should smoke alarms be located?
(A) They shall be located in each sleeping room and outside every sleeping area.
They should not be located within 3’-0” of a ceiling fan, within 3’-0” of a
supply duct, or within 3’-0” of door to a bathroom with a tub or shower.
3. (Q) When is a foundation inspection done on a foundation with a slab on grade?
(A) It is ok to do the foundation inspection at the same time as the slab
inspection as long as the footing projection can be verified.
4. (Q) Is termite treatment required on a detached building?
(A) Yes, there is no exception for a detached building in the code.
5. (Q) Is a vapor retarder required for a detached building?
(A) No, a vapor retarder is not required for unheated detached structures nor for
a garage attached or detached.
6. (Q) Are pergolas or arbors required to have a permit?
(A) No, if they are not attached to the house.
7. (Q) Do decks attached to the house have to be braced?
(A) Yes, they shall be brace along the outside girder parallel to the house. If
there is more than one girder line all girder lines shall be braced.
8. (Q) Do floor attics need to have guards at the edge of the flooring?
(A) Yes, if the attics are accessed by a fixed stair or full sized door.
9. (Q) Can 4x4 deck guard post be notched to fit around the band?
(A) No, the full 4x4 section must be maintained and be bolted with 3/8” through
bolts.
Residential Consistency
Land Use and Environmental Service Agency
(Code Enforcement)
July Q&A 2011
General:
1.
(Q) Is a permit required if painting and carpet is all that’s being done in a
residence?
(A) No, if it’s only paint and carpet a permit is not required even if it is over
$5,000.00
2. (Q) Is ridged foam insulation considered an air barrier when installed behind tubs?
(A) Yes, but the thermal barrier required by section 314.4 must also be installed.
3. (Q) Is a pier and curtain wall a structural wall?
(A) No, a double band or designed girder must be used to span between piers.
July 1, 2011 through September 30, 2011
Mecklenburg County Code Enforcement Department
Code Compliance Report
Data Summary
1. Building Inspections Top Fifteen Code Defects
Task
Item #
Item
MS
FR
FR
FT
FI
FR
FR
FR
FI
FI
FR
FI
FI
FR
FR
108
111
197
108
197
131
104
109
118
104
105
123
105
121
136
Need Soil/compaction test
Firestop incomplete or missing
Other defects listed on job
Need soil/compaction test
Other defects listed on job
Engineered roof design, installation, repair
Not ready for inspection
Foundation anchors missing
Handrail construction
Not ready for inspection
Call clerk or check Meckpermit.com for rem
Exterior grading
Call clerk or check Meckpermit.com for rem
Engineered floor installation or repairs
Ledgers/hangers incorrect or missing
TOTAL – Top 15 / Total # Defects
Rough 02's
Final 02's
04's
Job not ready
# Defects
338
268
201
196
155
122
111
96
87
81
80
71
69
69
66
2010 / 5994
2021
1365
435
% of Total
5.64%
4.47%
3.35%
3.27%
2.59%
2.04%
1.85%
1.60%
1.45%
1.35%
1.33%
1.18%
1.15%
1.15%
1.10%
33.53%
33.72%
22.77%
7.26%
2. Building Inspections Top Fifteen Code Defects Previous Quarter
Task
Item #
Item
# Defects
MS
FR
FR
FT
FI
FR
FI
FR
FI
FR
FR
FI
FR
FI
FT
108
111
197
108
197
131
118
109
104
195
104
105
190
123
104
Need Soil/compaction test
Firestop incomplete or missing
Other defects listed on job
Need soil/compaction test
Other defects listed on job
Engineered roof design, installation, repair
Handrail construction
Foundation anchors missing
Not ready for inspection
Previous list incomplete
Not ready for inspection
Call clerk or check Meckpermit.com for rem
Work may progress
Exterior grading
Not ready for inspection
381
221
213
188
127
113
106
99
91
85
80
75
72
68
55
1974 / 5507
6.92%
4.01%
3.87%
3.41%
2.31%
2.05%
1.92%
1.80%
1.65%
1.54%
1.45%
1.36%
1.31%
1.23%
1.00%
35.85%
1836
1219
350
33.34%
22.14%
6.36%
TOTAL – Top 15 / Total # Defects
Rough 02's
Final 02's
04's
Job not ready
% of Total
July 1, 2011 through September 30, 2011
Mecklenburg County Code Enforcement Department
Code Compliance Report
Data Summary
1. Electrical Inspections Top Fifteen Code Defects
Task
Item #
Item
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
25
19
W8
30
09
04
65
55
05
22
06
10
07
59
36
Improper overcurrent protection
Label panel
Defect caused by others
Improper wiring methods
Grounding
Job not ready
AFCI defect
GFCI defect general
Too many to list - insp stopped
Covers missing
Defects not corrected
Bonding
Need qualified individual to call inspector
No continuity on receptacle
Support raceways
TOTAL – Top 15 / Total # Defects
Rough 02's
Final 02's
04's
Job not ready
# Defects
169
165
161
150
136
113
106
98
70
70
69
63
61
57
52
1540 / 4346
600
2854
241
% of Total
3.89%
3.80%
3.70%
3.45%
3.13%
2.60%
2.44%
2.25%
1.61%
1.61%
1.59%
1.45%
1.40%
1.31%
1.20%
35.43%
13.81%
65.67%
5.55%
2. Electrical Inspections Top Fifteen Code Defects Previous Quarter
Task
Item #
Item
# Defects
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
RF
RF
RF
25
30
09
W8
19
65
05
04
55
10
31
07
04
W8
37
Improper overcurrent protection
Improper wiring methods
Grounding
Defect caused by others
Label panel
AFCI defect
Too many to list - insp stopped
Job not ready
GFCI defect general
Bonding
Cable subject to damage
Need qualified individual to call inspector
Job not ready
Defect caused by others
Need stud guards
152
145
127
124
104
95
81
79
73
64
53
52
48
48
47
1292 / 3538
4.30%
4.10%
3.59%
3.50%
2.94%
2.69%
2.29%
2.23%
2.06%
1.81%
1.50%
1.47%
1.36%
1.36%
1.33%
36.52%
584
2246
184
16.51%
63.48%
5.20%
TOTAL – Top 15 / Total # Defects
Rough 02's
Final 02's
04's
Job not ready
% of Total
July 1, 2011 through September 30, 2011
Mecklenburg County Code Enforcement Department
Code Compliance Report
Data Summary
1. Mechanical Inspections Top Fifteen Code Defects
Task
Item #
Item
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
FI
GT
RF
RF
A04
A08
A13
D05
E08
F01
F06
G03
H01
P01
Z96
Z99
G03
A04
D05
Job not ready for inspection
Need additional permits
Need ladder
Duct or boots not sealed
Equipment installation instructions not availa
Flue clearance incorrect
Flue not terminated properly
Gas test not to code or bad gauge
Damage caused by others
Primary or secondary drain missing or incor
Approval withheld for other trade requiremen
Other or no defect code applies
Gas test not to code or bad gauge
Job not ready for inspection
Duct or boots not sealed
# Defects
TOTAL – Top 15 / Total # Defects
Rough 02's
Final 02's
04's
Job not ready
% of Total
68
41
60
42
33
36
36
119
118
84
99
103
86
43
32
3.01%
1.82%
2.66%
1.86%
1.46%
1.60%
1.60%
5.27%
5.23%
3.72%
4.39%
4.57%
3.81%
1.91%
1.42%
1000 / 2256
44.33%
540
1532
120
23.94%
67.91%
5.32%
2. Mechanical Inspections Top Fifteen Code Defects Previous Quarter
Task
Item #
Item
FI
FI
FI
GT
FI
FI
FI
RF
RF
FI
RF
FI
RF
RF
FI
H01
Z99
G03
G03
Z96
A04
A13
D06
H01
P01
Z99
G14
G03
A04
D05
Damage caused by others
Other or no defect code applies
Gas test not to code or bad gauge
Gas test not to code or bad gauge
Approval withheld for other trade requiremen
Job not ready for inspection
Need ladder
Duct damaged or restricted
Damage caused by others
Primary or secondary drain missing or incor
Other or no defect code applies
Drip tee missing or incorrect
Gas test not to code or bad gauge
Job not ready for inspection
Duct or boots not sealed
TOTAL – Top 15 / Total # Defects
Rough 02's
Final 02's
04's
Job not ready
# Defects
% of Total
112
94
91
89
79
58
58
41
40
38
31
30
30
29
27
847 / 1836
6.10%
5.12%
4.96%
4.85%
4.30%
3.16%
3.16%
2.23%
2.18%
2.07%
1.69%
1.63%
1.63%
1.58%
1.47%
46.13%
408
1248
106
22.22%
67.97%
5.77%
July 1, 2011 through September 30, 2011
Mecklenburg County Code Enforcement Department
Code Compliance Report
Data Summary
1. Plumbing Inspections Top Fifteen Code Defects
Task
Item #
Item
RF
RF
RF
FI
WS
FI
FI
FI
FI
FI
FI
RF
WD
WD
FI
B31
A17
B51
E31
081
041
C71
H01
E81
B51
C21
B81
B31
C21
E71
Piping test missing or incorrect
Not complete-Partial equipment/systems
Piping support missing or incorrect
Handicap regulations missing or incorrect
Work covered up
Not ready
Equipment missing or not complete
Damage caused by others
Backflow requirements incorrect
Piping support missing or incorrect
Piping insulation missing or incorrect
Vent piping, or AAV Size, incorrect
Piping test missing or incorrect
Piping insulation missing or incorrect
Fixture installation incorrect
TOTAL – Top 15 / Total # Defects
Rough 02's
Final 02's
04's
# Defects
% of Total
100
32
32
31
29
27
27
27
26
22
22
22
22
22
20
9.85%
3.15%
3.15%
3.05%
2.86%
2.66%
2.66%
2.66%
2.56%
2.17%
2.17%
2.17%
2.17%
2.17%
1.97%
461 / 1015
45.42%
282
438
27.78%
43.15%
71
7.00%
Job not ready
2. Plumbing Inspections Top Fifteen Code Defects Previous Quarter
Task
Item #
Item
RF
FI
FI
WD
FI
FI
FI
FI
FI
SL
RF
FI
FI
RF
RF
B31
H01
041
B31
J41
D31
E71
E81
E31
B31
041
C21
C71
H01
B81
Piping test missing or incorrect
Damage caused by others
Not ready
Piping test missing or incorrect
Existing conditions not code compliant
T & P drain missing or incorrect
Fixture installation incorrect
Backflow requirements incorrect
Handicap regulations missing or incorrect
Piping test missing or incorrect
Not ready
Piping insulation missing or incorrect
Equipment missing or not complete
Damage caused by others
Vent piping, or AAV Size, incorrect
TOTAL – Top 15 / Total # Defects
Rough 02's
Final 02's
04's
Job not ready
# Defects
% of Total
87
40
30
25
24
21
20
18
16
16
15
13
13
13
12
363 / 679
12.81%
5.89%
4.42%
3.68%
3.53%
3.09%
2.95%
2.65%
2.36%
2.36%
2.21%
1.91%
1.91%
1.91%
1.77%
53.46%
177
315
67
26.07%
46.39%
9.87%
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 July
1, 2011 to September 30, 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 (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 704-336-3830).
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Mecklenburg County
Code Enforcement Department
Building Trades
Code Compliance Report
Quarterly Report
Building Inspections
Electrical Inspections
Mechanical Inspections
Plumbing Inspections
July 1, 2011 through September 30, 2011
MECKLENBURG COUNTY
Land Use and Environmental Service Agency
Code Enforcement
8/10/11 ELECTRICAL CONSISTENCY MEETING
Code Consistency Questions
1. Is low voltage cable allowed to be run through drilled holes in wood studs along with
normal 15 and 20 amp branch circuits in a single family dwelling?
Maybe and Yes. Per 725.136 there are many instances where the two are not allowed to be
run together; however at 725.136(I) it states:
I) Other Applications. For other applications, conductors of Class 2 and Class 3 circuits shall be
separated by at least 50 mm (2 in.) from conductors of any electric light, power, Class 1 non–
power-limited fire alarm or medium power network-powered broadband communications
circuits unless one of the following conditions is met:
(1) Either (a) all of the electric light, power, Class 1, non–power-limited fire alarm and
medium-power network-powered broadband communications circuit conductors or (b) all of
the Class 2 and Class 3 circuit conductors are in a raceway or in metal-sheathed, metal-clad,
non–metallic-sheathed, or Type UF cables.
(2) All of the electric light, power, Class 1 non–power-limited fire alarm, and medium-power
network-powered broadband communications circuit conductors are permanently separated
from all of the Class 2 and Class 3 circuit conductors by a continuous and firmly fixed
nonconductor, such as porcelain tubes or flexible tubing, in addition to the insulation on the
conductors.
2. I ran a 50a circuit to a wall mounted oven and tapped a #10 to feed a counter-mounted
cooking unit. The inspector turned me down and said this was only for the factory leads that
came with the oven. Is this correct?
Per NEC Article 210.19(A)(3). This is not totally correct.
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210.19(A)(3) covers factory-installed and field-installed tap conductors. The supply conductors
included in a factory-installed pigtail are considered to be tap conductors in applying this
exception. As illustrated below, this exception permits a 20-ampere tap conductor from a
range, oven, or cooking unit to be connected to a 50-ampere branch circuit if the following
four conditions are met:
1.
2.
3.
4.
The
The
The
The
taps are not longer than necessary to service or permit access to the junction box.
taps to each unit are properly spliced.
junction box is adjacent to each unit.
taps are of sufficient size for the load to be served.
3. Is a ground rod required to be driven when a generator is installed to feed a building as
a NON-separately derived system? What if it’s a separately derived system.
No, Yes. (See Attached)
System Bonding Jumper 250.30(A)(1)
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•
•
•
•
•
Connects the equipment grounding conductors of the derived system to the grounded
conductor of the derived system.
The system bonding jumper is sized in accordance with 250.28(A) through (D) based on the
size of the derived phase conductors.
Sized per Table 250.66 or 12½% rule if derived phase conductors exceed the values in Table
250.66
Locate system bonding jumper inside source enclosure or at any point to and including the
first disconnecting means or OC device of the system
The point of connection shall be made at the same point as the grounding electrode conductor
connection to the system
4. During an inspection of a new restaurant located in a mall, there is a shaft for rooftop
equipment and there is no way to enter the shaft for installation of raceways. The contractor
wants to install five runs of ½” flexible metal conduit with a maximum of four # 12 AWG
conductors. Section 348.30(A) Exception permits flex to be unsupported where fished. Do
product standards limit the maximum weight a flex connector can withstand and is this
installation permitted? If permitted is there a maximum vertical length flex can be fished?
It appears that the language in 348.30(A) does permit FMC to be unsecured and unsupported
when fished. Also unless the shaft is one of the areas not permitted by 348.12 and it appears
it is not, then the NEC would permit it. There are rules for conductor support in 300.19. The
UL white book PG 115 does not address the pull out requirements however; UL 514B requires
a 50 lbs pull for 5 minutes for FMC connectors. To me, this is a classic decision for the AHJ on
site. I don't believe that the CMP intended the unsupported length to be open ended. In
response to your FMC question, the UL pullout requirement for the 1/2 size is 75 lbs. I would
think that the length of the run would be a major consideration for this installation. Obviously
the longer the run the more weight the connector would have to contend with.
5. At a 4-story hotel, we are installing 480-volt feeders up to each floor and the design calls
for the grounding electrode conductor for the transformers to be installed in the power wiring
conduit that feeds into the transformer disconnect at each floor. The bonding is done in the
transformer. The building is poured concrete so the grounding electrode system consists of
the underground water piping and the concrete encased electrode. The power wiring is
installed in PVC conduit with an equipment-grounding conductor. Doesn’t the NEC require the
GEC to be run separately?
No, as long as all the applicable Code rules are followed. For the raceway aspect that is the
majority of the question, section 250.64(B) covers this. The grounding electrode conductor
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can be installed in the power conduit, in a separate conduit where physical protection is
required or open where protection from physical damage is not necessary. If any of the
raceway parts or enclosures are ferrous metal then those parts must be bonded at the entry
and exit to the grounding electrode conductor per 250.64(E). The other key part is
terminations. The question states the connection is in the transformer and that is fine, but the
connection where the feeder originates has to be considered. To meet the definition in Article
100 and section 250.24 the end of the grounding electrode conductor at the beginning of the
feeder must be connected directly to a grounding electrode or to a common grounding
electrode conductor by one of the connection means specified in 250.70.
6. I need to supply four 40-amp, 3-phase, 120/208 receptacles. These receptacles are all
adjacent to one another but the supply panel is quite some distance away. There is an
existing unused 90-amp (#4's & #8 ground) set of conductors less than 10 ft. from the
proposed new receptacles. The nameplate ampacity rating for each appliance is 25 amps
(ovens). Am I correct in understanding that the 10 ft. tap rule can be used to supply the new
receptacles provided that the tap conductor’s ampacity is not less than the combined
calculated loads of the tap feeder? If the tap conductors are individually routed properly, do I
need to provide an additional disconnecting means for these individual openings other than
the receptacles themselves? These commercial ovens are considered to be non-continuous
loads.
The installation method in this question does not meet NEC compliance. If the following code
sections are adhered to however, this installation is possible. 220.14 (A) [Specific Appliances
or Loads] requires the branch circuit loading to be calculated based on the equipment rating.
In this case the branch circuit would need to be rated for 100 amperes (4 @ 25 amps) not 90
amperes. 210.19 and 210.19(A)(4) require the branch circuit conductors to have an ampacity
not less than the maximum load served for non continuous loads. Receptacles (not outlets)
are mentioned in the question, so I’m assuming the ovens are cord and plug connected and
also portable. Section 210.19(A)(2) requires the conductors serving more than one receptacle
to have a rating not less than the rating of the branch circuit.
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7. I ran a raceway (tucked in a corner) up the entire length of a stairwell in a five-story
building. The raceway was for some new signs on the outside of the building. The Building
Inspector red-tagged it without leaving any explanation. Is this a violation of the NEC? If not,
what code is it from?
NO. Not an NEC violation. However there are many instances when the applicable building
codes prevail. Building codes do not allow anything in stairwell shaft enclosures unless they
are related to the stairwell. Example lighting, Fire Alarm etc. In the ICC building code sections
are 707.8.1 “Prohibited penetrations. Penetrations other than those necessary for the purpose
of the shaft shall not be permitted in shaft enclosures”
8. We have quite a bit of abandoned low-voltage communication cable in our facilities. Where
are the requirements in the NEC to remove this cable? When do cables have to be removed?
As a general rule, where the majority of the ceiling tiles are removed or replaced during the
project that portion of the ceiling shall have all abandoned cables removed and / or
supported and tagged for future use. The remaining cables shall be properly supported.
Section 640.3(A) for Audio Cable, Section 645.5(D)(6) for cables in Information Technology
Equipment spaces, Section 725.3(B) for Class 2 & 3 Circuits, Section 760.3(A) for Fire Alarm
Cables, Sections 770.3(A), 770.154(A) & 770.154(B)(1) for Optical Fiber Cables and
Raceways, Sections 800.3(C), 800.154(A) & 800.154(B)(1) for Communications Circuits,
Sections 820.3(A), 820.154 (A) and 820.154(B)(1) & (D) for CATV systems, Section 830.3(A)
for Network-powered Broadband cables.
9. If service drop conductors are increased in size due to voltage drop, is it required to
increase the size of the grounding electrode conductor?
No, 250.66 it must be sized based on the SE conductors not the service drop conductors.
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Land Use and Environmental Service Agency
Code Enforcement
7/13/11 ELECTRICAL CONSISTENCY MEETING
Code Consistency Questions
1. A design shows two hospital standby generators with each feeding directly into a 1200-
ampere, 277/480-volt outdoor sectioned switchgear that contains overcurrent/disconnect
devices in separate sections of each switchgear that partially feeds a hospital’s critical branch
to a transfer switch, life safety branch to a transfer switch, an equipment system transfer
switch, and a fire pump circuit to a transfer switch. Is this a Code compliant design?
Generator 1
Switchgear 1
Circuits to transfer switches
Generator 2
Switchgear 2
Section 517.26 requires compliance with Article 700, unless amended by the requirements in
Article 517. Section 700.9(B) has been clarified by adding new (5) permitting wiring from an
emergency source of power to supply any combination of emergency, legally required, and
optional loads as follows: (B) Wiring. Wiring of two or more emergency circuits supplied from
the same source shall be permitted in the same raceway, cable, box, or cabinet. Wiring from
an emergency source or emergency source distribution overcurrent protection to emergency
loads shall be kept entirely independent of all other wiring and equipment, unless otherwise
permitted in (1) through (5): (5) Wiring from an emergency source to supply any combination
of emergency, legally required, or optional loads in accordance with (a), (b) and (c): a. From
separate vertical switchboard sections, with or without a common bus, or from individual
disconnects mounted in separate enclosures; b. The common bus or separate sections of the
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switchboard or the individual enclosures shall be permitted to be supplied by single or multiple
feeders without overcurrent protection at the source and Exception to (5)(b): Overcurrent
protection shall be permitted at the source or for the equipment, provided the overcurrent
protection is selectively coordinated with the down-stream overcurrent protection.; and c.
Legally required and optional standby circuits shall not originate from the same vertical
switchboard section, panelboard enclosure, or individual disconnect enclosure as emergency
circuits.
2. Where 17-foot deep piers are used under a pier and beam dwelling with each pier having
contact with the earth for at least 14 feet and with four ½ -inch x 16-foot bars of reinforcing
steel being placed in each pier, could a single connection to one pier with all four bars being
connected to the grounding electrode conductor satisfy the requirements of 250.52(A)(3)?
Maybe, if the bars are tied together. See 250.52(A)(3) that states, “An electrode encased by
at least 50 mm (2 in.) of concrete, located horizontally near the bottom or vertically, and
within that portion of a concrete foundation or footing that is in direct contact with the earth,
consisting of at least 6.0 m (20 ft) of one or more bare or zinc galvanized or other electrically
conductive coated steel reinforcing bars or rods of not less than 13 mm (½ in.) in diameter, or
consisting of at least 6.0 m (20 ft) of bare copper conductor not smaller than 4 AWG.
Reinforcing bars shall be permitted to be bonded together by the usual tie wires or other
effective means. Where multiple concrete-encased electrodes are present at a building or
structure, it shall be permissible to bond only one into the grounding electrode system.”
3. Are over 600-volt, nominal, circuit breakers that are a part of metal-enclosed power
switchgear required to be individually locked in the open position, or as an alternative can a
lockable drawout mechanism be utilized where the circuit breaker is installed in a drawout
mechanism and the mechanism is capable of being locked in such a position that the
mechanism cannot be moved into the connected position?
See 490.46 that states, “Circuit breakers shall be capable of being locked in the open position
or, if they are installed in a drawout mechanism, that mechanism shall be capable of being
locked in such a position that the mechanism cannot be moved into the connected position. In
either case, the provision for locking shall remain in place with or without the lock.”
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4. Is there any way to install 480-volt lighting circuits served by a 480-volt corner-grounded
delta service inside a building or structure such as an enclosed sports stadium?
No, see new 210.6(D)(3) that states, “Luminaires powered from direct current systems where
the luminaire contains a listed, dc-rated ballast that provides isolation between the dc power
source and the lamp circuit and protection from electric shock when changing lamps.” New
paragraph 3 was the result of a rejected proposal (2-31) and later accepted comment (2-20)
that addresses florescent lighting in commercial and industrial buildings that can be powered
directly with DC power from photovoltaic (PV) systems. This is called Photovoltaic-Assisted
Lighting (PAL) and was first demonstrated more than 20 years ago at a supermarket on Long
Island, NY. PAL systems can use standard electronic ballasts as these contain rectifiers and
can work just as well on DC as AC power. The main advantages are efficiency and simplicity –
no power conditioning is needed between the PV system and the luminaires. Ballasts installed
in these systems as listed for DC use. AC ballasts operate best on DC if the DC voltage is near
the rectifier (peak) value of the normal AC supply. For 277 AC ballasts, this peak voltage is
391V (with maximum of 430V at 110% of normal AC voltage). This also keeps currents low
and reduces overall system costs. 210.6(D)(2) excludes luminaires for systems over 277V and
thus making photovoltaic-assisted lighting systems using 277V AC ballasts impractical.
5. Is it permissible to power a power-limited fire alarm power source from a general use
branch circuit or is a dedicated branch circuit required?
alternately served from a building’s emergency system?
Also, should such circuits be
1) A dedicated branch circuit is required based on 760.121(B) as follows: 760.121 Power
Sources for PLFA Circuits. (B) Branch Circuit. An individual branch circuit shall be required for
the supply of the power source. This branch circuit shall not be supplied through ground-fault
circuit interrupters or arc-fault circuit interrupters. 2) The alternate source of power for a fire
alarm panel would depend upon the fire alarm system that is installed, the type of facility
being protected, the ease of connection to the generator, and the possibility of battery backup as an alternate power source. NFPA 72 provides some very definite requirements for
alternate generator power to supply a fire alarm panel. These requirements are as follows:
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4.4.1.5 Secondary Power Supply.
4.4.1.5.1* Secondary Power Supply for Protected Premises Fire Alarm Systems. The
secondary power supply shall consist of one of the following:
(1) A storage battery dedicated to the fire alarm system arranged in accordance with 4.4.1.8
(2) An automatic starting, engine-driven generator serving the dedicated branch circuit
specified in 4.4.1.4.1 and arranged in accordance with 4.4.1.9.3.1 and storage batteries
dedicated to the fire alarm system with 4 hours of capacity arranged in accordance with
4.4.1.8
4.4.1.5.2 Secondary Power Supply for Supervising Station Facilities.
4.4.1.5.2.1 The secondary power supply shall consist of one of the following: (1) Storage
batteries dedicated to the supervising station equipment arranged in accordance with 4.4.1.8
(2) A dedicated branch circuit of an automatic-starting, engine-driven generator arranged in
accordance with
4.4.1.9.3.2(A) and storage batteries dedicated to the supervising station equipment with 4
hours of capacity arranged in accordance with 4.4.1.8
(3) A dedicated branch circuit of multiple engine-driven generators, at least one of which is
arranged for automatic starting in accordance with 4.4.1.9.3.2(A)
4.4.1.9 Engine-Driven Generators.
4.4.1.9.1 Application and Installation. The application and installation of engine-driven
generators shall be as specified in 4.4.1.9.2 through 4.4.1.9.7.
4.4.1.9.2 Primary Power Supply. Engine-driven generators arranged as the primary supply
shall be designed and installed in an approved manner.
4.4.1.9.3 Secondary Power Supplies.
4.4.1.9.3.1 Protected Premises.
(A) Engine-driven generators used to provide secondary power for a protected premises fire
alarm system shall comply with NFPA110, Standard for Emergency and Standby Power
Systems, Chapter 4, requirements for a Type 10, Class 24, Level 1 System. Installation shall
be in accordance with NFPA70, National Electrical Code, Article 700.
6. Where a single 30-ampere, 120/240-volt, single-phase circuit is installed for a combination
washer/dryer in dwelling unit, is it also required to install a 20-ampere 120-volt, 20-ampere
circuit as required by 210.11(C)(2) for the laundry? 2) Also, would the load of 1500-va be
required to be added to the dwelling calculated service ampacity as required by 220.52(B)?
3) What would be the demand in va for a washer/dryer that requires a 30-ampere, 120/240volt, single-phase plug-and-cord connected circuit in a dwelling or would we just count the
required 20-ampere laundry circuit at 1500 va and the separate dryer circuit at 5,000 va?
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1) Yes – 210.52(F) establishes requirements for 125V, 15 and 20A receptacles in addition to
others that may be installed. 2) Yes – 220.52(B) – This load is permitted to be included with
the general lighting load and subject to demand factors. 3) The VA calculation is based on
220.52(A) for the small appliance branch which is 1500VA and based on 220.54 the separate
dryer circuit would be 5000VA or the nameplate rating whichever is larger.
7. Are elevators in single family dwellings covered by the Inspection Department?
Yes, NEC 620 does not distinguish between commercial or residential installations. The
Administrative Code says DOL has jurisdiction over commercial installations and not single
family.
8. Are joints or splices permitted in the equipment grounding conductors in pool deck boxes?
No, per 680.24(D) Grounding Terminals. Junction boxes, transformer enclosures, and groundfault circuit-interrupter enclosures connected to a conduit that extends directly to a forming
shell or mounting bracket of a no-niche luminaire shall be provided with a number of
grounding terminals that shall be no fewer than one more than the number of conduit entries.
9. I have a cord and plug connected condensate pump for the furnace located in a crawl space or
unfinished basement. Does the receptacle for this pump have to be gfci protected?
Yes, 210.8 states (A) Dwelling Units. All 125-volt, single-phase, 15- and 20-ampere
receptacles installed in the locations specified in (1) through (8) shall have ground-fault
circuit-interrupter protection for personnel.
(4) Crawl spaces — at or below grade level
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(5) Unfinished basements — for purposes of this section, unfinished basements are defined as
portions or areas of the basement not intended as habitable rooms and limited to storage
areas, work areas, and the like
Exception to (5): A receptacle supplying only a permanently installed fire alarm or burglar
alarm system shall not be required to have ground-fault circuit-interrupter protection.
10. From what point, to what point, do you measure in order to determine if you have a storable
pool.
From the top most rim of the pool at the surface to the lowest point in the bottom.
11. I have a house that was built before the code required outdoor receptacles on the front
and/or the back of the house. If I add a room addition to this house am I now required to
add an outdoor receptacle?
Yes, If the room addition affects only the footprint of the front of the house, an outdoor
receptacle shall be added to the front; if the addition affects only the footprint of the back of
the house then an outdoor receptacle shall be added to the back; if the addition affects the
footprint of both the front and the back of the house then outdoor receptacle shall be added
to the front and back.
ALSO
If a major interior rewire is done on an existing house that involves the front or back or both
of the house at grade level; then outdoor receptacles shall also be added respectively.
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MECKLENBURG COUNTY
Land Use and Environmental Service Agency
Code Enforcement
9/14/11 ELECTRICAL CONSISTENCY MEETING
Code Consistency Questions
1. I recently installed a 45-KVA transformer, 480-volt primary and 120/208Y secondary. The
secondary conductors are # 2 THHN copper with an ampacity of 115 amperes. The
calculated load is 102 amperes. Using Section 240.21(C) (2) the secondary conductors supply
a MLO 42-circuit lighting and appliance branch circuit panel. The inspector rejected the
installation citing 240.4(F), requiring a main breaker. Is the installation in compliance?
No, 408.36(D) states: Where a panelboard is supplied through a transformer, the overcurrent
protection required by 408.36(A), (B), and (C) shall be located on the secondary side of the
transformer. The exception refers you to 240.21 (c)but that requires the conductors to be not
less than the rating of the device supplied by the secondary conductors or not less than the
rating of the overcurrent-protective device at the termination of the secondary conductors The
overcurrent protection needs to be a single device to meet this requirement for panelboards.
2. Is there a requirement in the code similar to the one in Article 550 that addresses a
maximum distance from the building a disconnecting means can be located? I would like to
have a pole-mounted service and then feed the building which is 200' away. There will be a
main breaker in the panel closest to the point of entrance inside the building. Basically
service on pole and feeder to building, service at building treated as sub-panel with isolated
neutral, 4 conductors and also a GEC. Or in other words. how far can the service
disconnecting means be from the building?
The maximum distance you discuss is not addressed in the Code. A service disconnect is
required at the service point. If you put a service disconnect (230.70) on a pole (now a
structure since you installed it, per definition of structure) 200 feet from a building, then the
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conductors from the disconnect to the building are now feeder conductors and need to be
protected at the source. 225.31 (more than one building or structure- pole is one structure,
building is the second ) requires a disconnecting means (rated as a service disconnect) at a
building or structure and the location is defined in 225.32 as at a readily accessible location
nearest the point of entry of the conductors. 250.32 says:
250.32 Buildings or Structures Supplied by a Feeder(s) or Branch Circuit(s).
(A) Grounding Electrode.
Building(s) or structure(s) supplied by feeder(s) or branch circuit(s) shall have a grounding
electrode or grounding electrode system installed in accordance with Part III of Article 250.
The grounding electrode conductor(s) shall be connected in accordance with 250.32(B) or (C).
Where there is no existing grounding electrode, the grounding electrode(s) required in 250.50
shall be installed.
3. I have a 50 amp 240 volt breaker ahead of a feeder to a subpanel for swimming pool
circuits. There are no GFCI breakers protecting the branch circuits from the pool subpanel. Is
this installation code compliant?
Partially compliant. 680.22(B) for pool motors and 680.23(A) 3 for underwater luminaires
require GFCI protection in the branch circuit. No other sections of 680 specify branch circuit
protection.
4. Does the equipment grounding conductor in feeder to a residential pier / dock have to be
copper?
682.31(A) says EGC's shall be insulated copper no smaller than #12.
feeder EGC's must be insulated.
682.31(C) says branch circuit EGC's must be insulated
682.31(B) says
5. Can a fire pump controller be fed from a UPS? Or is a separate service and separate
transfer switch required?
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695.3 requires that electric motor driven fire pumps have a reliable source of power and
permits either individual sources [695.3(A)] or multiple sources [695.3(B)]. The requirement
that the source be capable of carrying indefinitely the locked rotor current of the fire pump
motor would rule out UPS systems because they have a fixed amount of energy storage.
Either a separate service or a connection to the service before the facility service disconnect
switch is acceptable as well as a on-site power production facility.
6. I have a 2 in copper water line coming into a building from the street.[50ft] I have a
second copper water line coming into the building feeding the sprinkler system[50ft]. Both
water lines turn up in the same room. Do both water lines have to be grounded to the
service? The E/C on jobsite hit both water lines with his 3/0 grounding electrode and the fire
marshal told him that he couldn't run the ground to the water line that feeds the sprinkler. Is
the fire marshal correct?
Per NFPA 13, the sprinkler system must be bonded to the GEC system and can’t be used as a
grounding electrode
7. I got a call from an angry contractor saying we were inconsistent in a call we were making
on outdoor boxes for ceiling fans on a pergola.ch. Apparently, some of the inspectors are
allowing him to use a fan box (not approved for outdoor) and then using a weatherproofing
product to seal the holes in the box to make them weatherproof. Can he do this.
No. The box in use must be listed for the environment it’s installed in, and alterations
to the box may violate that listing. These alterations would require a new listing for that box.
8. I have got a permit and gone out on a job to get the power restored per the Utility Co.
request. There is no damage, no obvious violations, and it appears no work is needed to be
done, however I have noticed that there is no driven ground rod(s). Am I required to drive a
ground rod in this case? How many?
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Yes, and there shall be two rods driven
9. What is the maximum length of an equipment-bonding conductor installed on the outside
of a raceway?
In general the maximum length is 6 feet as specified in 250.102(E). An exception
allows greater than 6 feet for outside pole locations where the 6 foot limitation is
not practicable to bond isolated sections of metal raceway. An example for the
exception is a metal raceway as a riser on a pole for physical protection and stops
at 8 to 10 feet above grade, but the bonding jumper from the pole line grounded
conductor to the metal raceway will generally be longer than 6 feet.
10. A large trailer-mounted portable generator is being used for the temporary power at a
construction site. The electrical contractor argues that since the generator has no provisions
for a grounding electrode that the generator is isolated from ground and so does not need
GFCI protection for personnel for 125-volt, 15- 20- and 30-ampere receptacles. Is he correct?
No. Section 590.6(A) requires all temporary wiring to have GFCI protection for
those particular receptacles. This requirement is clarified in a change for 2008 that
specifies generators as a power source.
11. The NEC requires conductors that are run through bored holes and foamed-in to be derated. Do the wires that are run through a nipple in the back of a panel and are foamed-in to
prevent temperature migration need to be de-rated also?
Section 334.80 requires this type of installation to comply with Table
310.15(B)(2)(a). The requirement for de-rating conductors installed in a nipple
would be based on any specific ampacity requirements in their respective articles
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or Chapter 9 and on Section 310.15(B)(2)(a). See 310.15(B)(2)(a) Ex 3
12. I am wiring a remote cabin and using an outdoor generator with a factory-installed main.
It is located 35' away and is the cabin's sole source of power. Do I need a main in the panel
at the cabin or does the main at the generator satisfy the requirement?
Section 445.18 requires that a generator must be equipped with a disconnecting
means to disconnect the circuit(s) supplied; with 2 exceptions. The supply to the
cabin could be considered an outside feeder and subject to the code rules in Article
225 Part II, if the disconnect is suitable for service equipment and the service is
grounded and bonded at that point. If not, consider the supply a service to the
cabin. In any event, the disconnect on the generator would not meet the
requirements of Section 225.31 or 230.70.
13. Is it legal to install a non-fused disconnect next to a meter, run 20' on the outside of a
building, then into the back of a main breaker panel?
No 230.91 The service overcurrent device shall be an integral part of the service disconnecting
means or shall be located immediately adjacent thereto. Unless it meet the requiements of
230.82 (a) 3
230.82 Equipment Connected to the Supply Side of Service Disconnect.
(3) Meter disconnect switches nominally rated not in excess of 600 volts that have a shortcircuit current rating equal to or greater than the available short-circuit current, provided all
metal housings and service enclosures are grounded in accordance with Part VII and bonded
in accordance with Part V of Article 250. A meter disconnect switch shall be capable of
interrupting the load served.
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NC Fuel Gas Code 2011
Attention:  Denotes a new question from the most current month!
 Denotes a revised/revisited question.
September 2011
Table of Contents
Chapter 1 Administration
Chapter 3 General Regulations
Chapter 5 Chimneys & Vents
Chapter 7 Gaseous Hydrogen S.
POLICY
Chapter 2 Definitions
Chapter 4 Gas Piping Install.
Chapter 6 Specific Appliances.
Chapter 8 Ind./Special Waste
OTHER
Chapter 1 Administrative:
1) (Q) An engineer provides combustion and ventilation air louver calculations on a
Mechanical Plan for an equipment room with both oil and gas fired equipment.
Can the plans examiner accept the calculations as an alternate design?
(A) Yes. The plan reviewer would need to decide if the calculations and louver
Meet the equivalency test per 105.2.
2) (Q) A Mechanical Inspector is inspecting a furnace change out which did not
require plan review. He notices the new furnace is significantly heavier that the
old unit that has been replaced. Can the inspector pass the inspection as is?
(A)The inspector can use his discretionary powers as a sworn official of the state in one
of three ways. 1. He can determine that the weight of the unit is sufficiently
supported as installed and approve the inspection as is. 2. He can turn the unit down
until he receives a letter from a structural engineer that the installation is supported
per code. 3. He can require plans to be submitted with structural information about
support of the unit to be approved by plan review. Ref: 107.3 NCSBC; Admin.
Code.
Chapter 3General Regulations:
1) Q) The installation instructions for an 80 percent furnace cautions against
providing combustion air from areas such as laundry rooms. The
manufacturer states that installation of a furnace adjacent to laundry
equipment can lead to premature corrosion from chemicals in laundry
detergents. Would it be acceptable to draw combustion air from an open
basement or garage, which by definition is not a confined space, even though
laundry equipment is also located in that space?
A) The unit must be installed according to manufacturer's specifications;
however, as long as it is not in a confined space and the area can provide
adequate combustion air, the installation described above would not be an
issue. The intent of the manufacturers' caution statement is to address a
small room specifically designated as a laundry room. 303.1
3rd Quarter
Land Use and Environmental Service Agency
(Code Enforcement)
NC Fuel Gas Code 2011
Attention:  Denotes a new question from the most current month!
 Denotes a revised/revisited question.
September 2011
2) Q) At the final inspection the mechanical inspector finds the 3rd party label is missing from
a gas regulator. The contractor tells the inspector that the factory “self certifies” the
regulator to meet the ASTM requirements and presents a letter from the factory
verifying the product has been tested at the factory. Should the inspector approve the
regulator “as is” and final the inspection?
(A) The field inspector should turn the regulator down until it can be determined if the
product meets the ASTM standard specified by the code with the proper label from
the testing lab. Per the Department of Insurance a factory is not allowed to “self
certify” a product. It must have the listing and labeling information from an
approved testing facility. Approved facilities can be found on the DOI web site. Ref:
301.3, 301.5
3) (Q) A gas appliance has been changed out “like for like” in a residential single family
dwelling, however, it is located in a closet opening directly into a bathroom. The closet
door is not louvered; however, the door has been undercut. Can this change out be
approved by the inspector without additional changes?
(A) No. Combustion and ventilation air shall come directly from the outside and the
door shall be weather stripped with a self-closing device. In addition the closet
cannot be used for any other purpose. Ref: 303.3, exception # 5
4) (Q) A boiler requires a barrier separation per the NC Building Code. The boiler is gas
fired and exceeds 15 PSI and 10 Boiler Horsepower. What code requirements would
the boiler have to meet to be approved for minimum combustion and ventilation air
requirements?
(A) Combustion and ventilation air shall be calculated per Section 304 of the NC
Fuel Gas code. If the boiler is regulated by the NC Department of Labor per GS 95
and different criteria exist for combustion and ventilation air then either code
calculation is acceptable as meeting minimum code requirements.
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. Ref: 408
2)
(Q) May a flexible gas connector run through the appliance housing?
A) No! Ref: 411.1.3.3
3rd Quarter
Land Use and Environmental Service Agency
(Code Enforcement)
NC Fuel Gas Code 2011
Attention:  Denotes a new question from the most current month!
 Denotes a revised/revisited question.
September 2011
3)
3rd Quarter
Land Use and Environmental Service Agency
(Code Enforcement)
(Q) A home inspector has disapproved the material for a “T” fitting in a gas line
stating in his report: “There is a galvanized “T” fitting in the gas line at the first
floor furnace. This is not an acceptable material for gas piping. The galvanizing will
flake off and cause problems with the gas equipment. I recommend correction by a
qualified plumber.” Is this a correct call by the home inspector?
(A) NO. Galvanized pipe and fittings are an approved material. See material listing.
Re: Section 403.
Chapter 5 Chimneys and Vents:
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
2) (Q) Screws in venting: Are they necessary? For example, in type B venting.
A) No. Some Manufacturer’s instructions actually allow screws at joints as long as 3
they do not penetrate past the outer wall of the B vent. Ref: 503.6
3) (Q)Under what circumstances, if any, may gas appliance connectors pass through the
following? (a) An appliance housing. (b) A factory built fireplace. (c) A floor. (d)
A wall.
(A) (a) If the appliance housing is listed and approved for the vent material
passing through the housing. (b) Similar to answer (a) Ref: 501.7.2 3.
(c) & (d) Not allowed. Single Wall Connector Ref: 503.10.14, (see exceptions)
Medium heat connectors. Ref: 503.10.16
4)
(Q) A Mechanical Contractor has insulated the vent for a 90+ furnace within
an unconditioned space in a single family home. Should the Mechanical
Inspector turn him down? The contractor tells the inspector the requirement is in
the manufacturer’s instructions.
(A) The inspector would have to approve the installation if the contractor is
correct about the manufacturer’s instructions. The inspector can still call the
manufacturer for clarification. Ref: 503.4.1, 503.4.2
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Chapter 6 Specific Appliances:
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?
A) No. Unvented room heaters shall not be installed within Groups A, E, and I
Occupancies. Ref: 621.4 (FGC)
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. 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.
3) (Q) What is the BTUH conversion factor for BTUH to Boiler Horse Power?
A) One boiler horse power equal 330,000 BTUH.
4) (Q) 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: 631.3. (FGC)
5) (Q) When the stamping on a pressure-retaining item becomes indistinct or the
nameplate is lost, illegible, or loose, but traceability to the original pressureretaining item is still possible, can a new nameplate be made and attached to
anexistingboiler?
Answer: Yes. All re-stamping must be done in accordance with the original
code of construction. Requests for permission to re-stamp or replace
nameplates must be made to the jurisdiction in which the pressure-retaining
item is located. The jurisdiction may grant such requests if satisfied with the
information submitted. Permission from the jurisdiction is not required for
the reattachment of nameplates that are loose or not fully attached. When
traceability cannot be established, the jurisdiction must be contacted.
Ref; 105, 301.4, 631.1, 631.2
6) (Q) I am a homeowner and I have built a new home. I am selling my existing
home which is being moved off site to make way for a new highway.
The gas water heater is only 2 years old. I am going to re-locate it to my new
residence. I am doing all of the work myself. Is this allowed in Mecklenburg
County?
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(A) Yes. You must pass the homeowners test and pull all required permits. The
installation must meet current code. Ref: 102.7, 624.1
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Table of Contents
Chapter 1 Administration
Chapter 2 Definitions
Chapter 3 General Regulations
Chapter 4 Ventilation.
Chapter 5 Exhaust Systems
Chapter 6 Duct Systems
Chapter 7 Combustion Air
Chapter 8 Chimneys & Vents
Chapter 9 Specific Appliances
Chapter 10 Boilers, Water Htrs
Chapter 11 Refrigeration
Chapter 12 Hydronic Piping
Chapter 13 Fuel Oil Piping
Chapter 14 Solar Systems
POLICY
OTHER
Chapter 1 Administration:
1) (Q) Is it the responsibility of a plans examiner or inspector to inform a designer or contractor
of additional requirements of other State agencies or licensing boards?
(A) No. It is not the responsibility of the inspector or plans examiner. It shall be the
responsibility of the permit holder, design professional, contractor, or occupational
license holder to determine whether any additional requirements exist. 101.5
2) (Q) Are explosion proof condensate pumps allowed to be installed on the floor of
a garage?
(A) Yes. Although a condensate pump, by definition would not be considered an
appliance, when used in conjunction with heating and/or air conditioning
equipment, it becomes an appurtenance to that appliance.
Condensate pumps, used as an appurtenance to a heating/cooling appliance
which generates a glow, spark or flame, capable of igniting gasoline vapors and
located in a garage shall be installed with burners, burner ignition devices or
heating elements and switches at least 18 inches above the floor level.
Condensate pumps installed on the floor of the garage must be listed and labeled
for installation in a Class 1, Division 2 location, as specified in the NEC, Article
500. An "explosion proof" rating, by itself, does not necessarily mean the
equipment will meet this requirement. Listed equipment will be marked to show
the class, group (division) and operating temperature or temperature range in
which the equipment can be used. The identification numbers are marked on the
equipment nameplate. Ref: 102.9
Chapter 3 General Requirements:
1) (Q) What are the requirements for systems installed in a flood plain?
(A) Section 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 permittedto
be located below the design flood elevation provided that they are designed andinstalled
to prevent water from entering or accumulating within the components and to resist
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hydrostatic and hydrodynamic loads and stresses, including theeffects of buoyancy,
during the occurrence of flooding to the design flood elevationin 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 also 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 in
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 increasing in pipe size to limit blockages.
3) (Q) What type of access would be required for a boiler installation where the boiler devices
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.
4) Q) Where are the seismic strapping requirements for air conditioners and/or heat
pumps in the NC Mechanical Code?
(A) Seismic requirements and zone information is in the Building Code as
referenced by 301.15 of the Mechanical Code.
5) (Q Do copper condensate lines or return piping of heating/cooling units that are in direct
contact with galvanized sheet metal duct and/or plenum constitute a potential for galvanic
action?
(A) It is recommended that piping be protected from potential corrosion by protecting or
isolating the piping. 307.2.2
6)
(Q) What is the proper way to protect an appliance in a residential garage?
(A) From the information we have from DOI and past practice if you pulled a straight
edge from the garage door opening to the rear of the opening, if the appliance in
question was not in the normal path of the vehicle, then no protection is required. No
what if’s Ref: 303.4
7)
(Q) A mechanical contractor requested an interpretation as to whether traps were required
on the condensate from an evaporator coil and if we knew of any conflicts with the
energy code involving cleanout vent/ tees on a blow-through unit discharging into an
unconditioned area (attic/crawl space)?
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(A)
The code requires the inspector to rely on the manufacturer’s data to determine if a
trapped drain is required. If any conflicts with other codes are apparent then the
contractor may need to consult with the manufacturer to resolve the problem and
inform the inspector of the issues. Ref: 307.2.4
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.
Chapter 5 Exhaust Systems:
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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4) (Q)The Mechanical inspector has turned a residential range exhaust installation down
because the contractor has used screws to join the pipe together and then sealed the pipe
joints with mastic. The pipe extends up through the roof and is terminated per code. Is this
inspector correct? Is this a code violation?
(A) The inspector may consider this a code violation; reference is 505.1 “smooth inner
walls,” however there are minimal code restrictions on residential hood installations.
While the code reference says smooth we would accept small screws and mastic to
fasten the duct joints together. Ref: 505.1
5) (Q) A contractor asks the inspector if he can combine the bathroom exhaust with the dryer
exhaust to value engineer the job for the owner and appease the Architect who is
complaining about all of the exterior wall penetrations disturbing the ambiance of his
finished exterior walls. Can the inspector allow this installation? Will a redesign in duct
sizing, fittings or joints be required?
(A) No. No comingling of the dryer exhaust is allowed by code. Ref: 504.1
6) (Q) A battery room is installed in an existing multistory building. The designer says it is
virtually impossible to run the exhaust duct up to the roof because of the tenants and
space in the ceiling above so he wants to run the duct into an area way in the middle of
the building that is enclosed on all four sides similar to an interior courtyard in an office
building. The only thing located in the area way are 10 compressors for AC to the
various building tenants. His problem with running the duct to the area way is that he can
only get 3 feet of clearance to terminate the exhaust duct. Can this installation be allowed
per Code?
(A) No, Ref: 501.2.1 sub (1) for conveyance of flammable/explosive vapors.
7) (Q) A UL listed grease duct installation for a type I hood is called for inspection. Duct joints
are not welded per code requirements; however, the installation instructions show
approved joint connections without welded joints. What would the inspector be required
to inspect? How does the inspector look at the installation for code compliance? What
tests are required for system approval?
(A) Inspection of the manufactured system would have to comply with all standard tests
for grease duct required for type I hoods including 506.3.2.5. Any tests specified in the
manufacturers literature will also be the responsibility of the field inspector. Ref:
506.3.2.5
8) (Q) Under what conditions can an outdoor grill and hood be installed under a covered porch?
(A) The hood would be approved if installed per the manufacturer’s installation
instructions, including the correct fan, and unit sizing-and it is used in a single family
detached dwelling. No townhouse/condo/apartment use would be allowed. Ref: 506.4.1
9) (Q) A manufacturer has submitted a dryer booster fan to be used in a residential application
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per IRC 1501. Would the inspector approve the booster fan if the contractor has the
letter on site for the inspection?
(A) Dryer booster fans are not allowed by the code. There is no code language to allow
their use. Ref: 504.1
10) (Q) A counter mounted, induction type, two burner range with a down draft exhaust filter is installed
on a counter top in a restaurant open bar buffet. The appliance is cord and plug connected 208V
three phase with two burners. The manufacturer does not think a hood or fire suppression system
should be required since the unit will be used for sauté and warming only. Should a hood and fire
suppression system be required?
(A) Yes. The food is producing grease laden vapors and therefore should have a hood and
suppression system installed per code. Ref: 507.2.1
Chapter 6 Duct Systems:
1) (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.
2) (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
3) (Q) Unlisted duct tape has been installed on the metal to metal and flex to metal airduct joints
of a furnace installation in a single-family dwelling. Is it required that the unlisted duct
tape be removed before installing the approved tape or mastic?
(A) No, approved tape may be installed over unlisted duct tape unless the listing, labeling
or manufacturer’s instructions supersede the allowance of such material. Ref: 603.9
4)
(Q) What is considered proper access for smoke/fire dampers?
(A) 607.5 states that the damper must be accessible for removal/maintenance.
5) (Q) Are fire dampers, smoke dampers, or combination dampers required in walls that
separate a garage from the residential living space in a single family dwelling?
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(A) The code has no provisions for a fire damper of any type to be required in this
residential installation. 603.1.2
6) (Q) Are longitudinal seams required to be sealed in a duct used to exhaust a bath fan?
(A) Yes. Our policy has always been to seal the seams in a longitudinal duct run in a
residential application to prevent any duct leakage on the ceiling. Recent DOI
interpretations of the 2012 code MC Section 603.9 back the department position to
seal the exhaust duct. The 2009 code vaguely describes “contamination prevention”
in 601.4 but exempts one and two family dwellings. Ref; 603.9
7) (Q) A listed and labeled product (return air grill) is being installed in a panned 2 by 4 wall
stud cavity. A return air grill is being installed in the wall cavity at a depth of 1 inch
leaving only 2 inches between the return collar and the filter. Is this installation allowed
by Code?
(A) The inspector must look at the surface area to determine if this installation will meet
code. Ref: 602.3, 605.2
8)
(Q) Charlotte Pipe has a new CPVC pipe called ChemDrain with a Zero flame spread rating
and a smoke developed rating of between 8 and 22 based on ULC S102.2. Can we allow
this new pipe in return air plenums?
(A) Yes. As long as it is tested and approved for at least 25-50 smoke and flame spread
rating we would allow the product in return air plenums. Ref: 602.2.1
9)
(Q) A residential 3 story apartment building has louvered doors on a closet which is used for the
return air to the AC unit. The closet doors are made out of wood. (a)Is the closet allowed to be used as
part of the return? (b)Does the closet meet minimum requirements for a return air plenum? (c) Could
the doors be used in a commercial office space?
(A) (a) Yes. (b) Yes. (c) Plenums in dwellings are not required to meet the code requirements for
non-combustible materials within plenum spaces. Materials in plenums for all other occupancies
shall be non-combustible or meet 25-50 requirements. Ref; 602.2, 602.2.1, 602.2.1 exception # 3.
10) (Q) What are the minimum requirements for access to a fire damper located inside a duct when the
ductwork is located behind a sheet rock wall? Would the requirements be the same for commercial
and residential construction?
(A) The access shall be by an approved means large enough to permit inspection and maintenance
of the damper and its operating parts. The access opening shall not affect the integrity of fireresistance rated assemblies. Access doors in ducts shall be tight fitting and suitable for the
required duct construction. Ref: 607.4 [B]
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Chapter 9 Specific Appliances, Fireplaces and Solid Fuel-Burning Equipment:
1) (Q) What is the minimum clearance of a microwave oven hung under an existing stove cook
top? The manufacturer’s instructions require a 24 inch clearance. This clearance will work
but just barely because of the existing cabinet height. The house is in a historic district and
the governing board does not allow removal or alteration of existing cabinets in the district.
Can the inspector allow the manufacturers approved clearance?
(A) Yes. Install the equipment per manufacturer’s clearances. Ref: 917.4
Chapter 10 Boilers, Water Heaters and Pressure Vessels:
(1) (Q) An out of state jurisdiction ask the department about the enforcement of ASME Boiler
and Pressure vessel regulation enforcement for the state of North Carolina. Who
enforces regulations for UNFIRED pressure vessels for (1) Newly installed pressure
vessels to comply with ASME Boiler and Pressure Vessel Code, (2) Repairs and
alterations for existing boilers, and (3) Other regulations or codes that also apply to
boilers?
(A) The Department of Labor Boiler and Pressure Vessel division has primary
responsibility over boiler inspections, however there is a list of exempt boilers. The
exempt boilers are governed by the North Carolina Mechanical and Fuel Gas codes
as enforced by the Office of the State Fire Marshall through the Department of
Insurance. Ref: Ch. 10 and NCGS 95-69.10/ BPV Rules.
(2)
(Q) When the stamping on a pressure-retaining item becomes indistinct or the nameplate is
lost, illegible, or loose, but traceability to the original pressure-retaining item is still
possible, can a new nameplate be made and attached to the existing boiler?
(A) Yes. All re-stamping must be done in accordance with the original code of construction.
Requests for permission to re-stamp or replace nameplates must be made to the
jurisdiction in which the pressure-retaining item is located. The jurisdiction may grant
such requests if satisfied with the information submitted. Permission from the
jurisdiction is not required for the reattachment of nameplates that are loose or not fully
attached. When traceability cannot be established, the jurisdiction must be contacted.
Ref; 105, 301.4, 1004.1, 1004.2
(3)
(Q) If multiple water heaters were piped together for space heating, would
Btu's and volume combine to make the system a boiler?
(A) No. See boiler definition 1001.1 Exception 7, NC Dept of Labor
Chapter 95. Note: The combined BTU’s will be used to calculate
combustion and ventilation air requirements. Ref: 1001.1 definition and
exception 7, NC Dept. of Labor Chapter 95.
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Chapter 11 Refrigeration:
1) (Q) An existing chiller is being replaced. The existing chiller uses R-22. The chiller is in an
existing mechanical room. The new chiller will be using the more environmentally
friendly R-410-A refrigerant. The existing chiller room has a volume of 925 sq. feet and a
cu ft. volume of 12,025. The new chiller has 160 lb of R-410A in its largest refrigerant
circuit. The chillers quantity exceeds the capacity of the room as provided for in the chart
in tbl. 1103.1 2009 NC mech. Code. Table 1103.1 has been changed in the 2012 North
Carolina code and the quantity of R-410 has been reduced to 25lb/1000 cu. ft. There are
no other changes in the code that would change the quantities. Can the code official
allow the new code quantities to be used so a separate mechanical room will not be
required?
(A) Since there are no other changes that would require the designer to build a separate
mechanical room the new table quantity is approved as an alternate design. Ref:
Table 1103.1- 2012 and Table 1103.1- 2009
2) (Q) Can recovered refrigerants be re-used by the same owner?
(A) Yes. They shall be filtered and dried and they may also be required to be reclaimed if
clear signs of contamination exist. Ref; 1102.2.2.2
3)
(Q) Can reclaimed refrigerants be used in a different owner’s equipment?
(A) Yes. The refrigerant must be tested and found to meet ARI 700 teat requirements.
Ref: 1102.2.2.3
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 required to be
assembled (excluding the walk-in cooler box) OR any equipment required to be hard
wired electrically (not cord and plug type).
2) (Q) Is the outside air make-up air duct located on the non-insulated side of an attic space 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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3) (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:
R313.1.1 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. R313.1.2 Where required-existing dwellings. In existing dwellings,
where interior alterations, repairs, fuel-fired appliance replacements, or additions
requiring a permit occur, 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
5) (Q) Does the code limit the noise level produced by heat pumps and air conditioners?
(A) No. There are not any requirements restricting the noise levels of this equipment in the
current code. Local ordinances dictate noise levels and are not enforced by building
code enforcement officials in Mecklenburg County.
6) (Q) When extending gas pipe to non-electrical gas equipment (barbecue, insert, are you
required to bond the existing gas pipe connected to an existing gas or electrical appliance?
(A) No, unless the alteration creates the potential to be energized.
Administrative Information
1) (Q) A mechanical contractor is adding economizers to existing commercial air conditioning units on a
roof. Are permits required to add economizers to the existing units? Are plans required before a
permit can be issued?
(A) Permits are required per the North Carolina Administrative Code. Plans may be required
dependent upon the scope of work and energy code requirements. CTAC usually determines if this
information is needed prior to issuing a permit. Ref: North Carolina State Building Code:
Administrative Code and Policies
2) (Q) Does the Department of Insurance still maintain a list of third party approved agencies
for Electrical, Mechanical, Plumbing and Fuel Gas products? It is my understanding they did
away with the list.
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(A) Yes. The Department of Insurance still has the approve list of third party testing
agencies on its web site but only for Electrical and Mechanical Equipment. Go to:
http://wwwNCDOI.com/OSFM/Engineering/BCC/engineering bcc third party. ASP
3) (Q) I am a homeowner and I have a complaint about a licensed Mechanical Contractor. The
contractor did not complete the work in the contract. Who do I call to file a complaint?
(A) Contact John Todaro, he is the area representative for the North Carolina Board of
Plumbing, Heating and Fire Sprinkler Contractors. His email address is:
jtodaro@NCLICENSING.ORG
.
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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
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
OTHER
Chapter 3 General Regulations:
1) (Q) Is a check valve required on the water supply to a mobile home?
(A) 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.
2) (Q) Under what circumstances can a nylon zip tie be used as a pipe strap for pex pipe?
(A) This application can be used in parallel water distribution systems for bundling or
securing, not supporting purposes, unless the zip tie is listed for that application. Ref:
308.9
3) (Q) What is the minimum height required by code on a partition between water closets in a
multi fixture bathroom group?
(A) The code does not specifically cover the height of the partition. It requires the water
closets to be “suitably screened for privacy”. The typical partition sold is 5feet high and
there is a 1 foot clearance under partitions for cleaning and sanitation. The total height
of the partition with clearance is 6 feet. Ref: 310.4, 310.5
4)
(Q) A large fast food chain wants to stay in operation during a major remodel by keeping the
drive through window open and employee’s only working in the building. The
building will not be serving customers inside the restaurant. The contractor wants to
remodel both bathrooms at the same time and provide a temporary bathroom facility
outside the building. Will this be allowed by the Plumbing Official?
(A) No. Any time you have permanent utilities on the site they must connect to the plumbing
facilities if the public or employees are still running a business out of the building.
Alternate approved method: Install a temporary handicap facility with permanent
connections to the utility for water and sanitary sewer. The walkway from the
occupied business to the bathrooms shall be covered or in a corridor and not more
that 500 feet from the employee work area. The bathroom(s) shall be handicap
accessible. Ref: 301.3, 301.4
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5)
(Q) Is it required to insulate thermal expansion tanks that are installed in residential
garages? After all, there is very little if any water that would occupy space in the tank.
Should any freezing occur, there would be ample room for any expansion within the
tank.
(A) The ruling from this department on insulating appliances in a garage has been; if the
water piping must be insulated, then the expansion tank does as well. NCDOI has
concurred with this interpretation and they state “if exposed inside an unheated
residential garage, it must be insulated” Ref: 305.6
6)
(Q) A pool equipment room located in an apartment complex is not used in the winter months.
The water lines are drained to prevent freezing. Is the trap on the sink located in the pool
equipment room required to be insulated?
(A) Yes. The water piping and sink drain trap shall be insulated. Ref: 305.6. 305.6.1
7)
(Q) Is the water piping in the wall separating habitable space from the garage in a single
family residence required to be protected from freezing?
(A) Yes. Water piping installed in attics or unconditioned utility rooms shall be insulated
with an insulation having a minimum R-factor of 6.5 at 75 Degrees F in accordance
with ASTM C-177. Garages are similar spaces. Ref: 305.6
Chapter 4 Fixtures, Faucets and Fixture Fittings:
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: 417.4The maximum
height for the threshold of a handicap shower, (either roll-in 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, non-absorbent, 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 3inch drain for the washers. Will the re-hab code
offer me any relief so these 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
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4) (Q) Is a drain required for an outside shower used on a pool deck that hasonly a cold water
connection?
(A) No. The shower is not used for bathing and has no hot waterconnection. 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
5)
(Q) Are bottle trap installations allowed by the NC Plumbing Code?
Since they are not expressly prohibited by ICC we would have to approve them as long
as they meet the standards listed under NC IPC 421.1.2 and comply with ASME
A112.18.2. also, ref: 1002.3 #6
6)
(Q) An engineer submits a plan with a system of trench drains in a factory that drain various
grease producing cooking equipment to a grease interceptor located outside the building.
The engineer wants to pour concrete forms and install stainless steel trench drain inserts
in the concrete. The project is turned down by the plan examiner. Neither the plans nor
specifications show how the project meets 412.1 construction requirements (ASME
A112.6.3.). What information does the plan reviewer need to approve the review?
(A)The Engineer suggested supplying a letter showing how the installation met the trench
drain provision ASME A112.6.3. The CA agreed to review the engineers sealed letter.
If the letter was disapproved by the CA the engineer would be required to provide
trench drains that meet the code or have the trench drains field verified by a third
party testing agency to meet the ASTM standard. Ref: 412.1.
7)
(Q) My church has ball fields and they would like to build toilets facilities in lieu of the
portable units they have now. Because they are not required by code do we have to
meet a certain number of toilets?
(A) The following code interpretation was put out by the department in 1993 with the
assistance of the parks department and should be used as a guide to determine the
fixture count for your church ball field. Ref: Table 403.1, Park Fixture
Requirements. Revised April 2009. The information on calculating the minimum
facilities is in the chapter 4 interpretations reference guide on our web site.
8)
(Q) Are there specific minimum facilities requirements for medical office buildings? What
information do I need to calculate and label bathrooms for male, female and
unisex use ?
(A) Yes. Because of the number of facilities in a typical medical office building and
the availability of assistance by nurses and medical personnel for patients the following
calculations shall be used ONLY in a medical office building for minimum facilities
counts per the Plumbing official.
Special requirements for minimum facilities in medical office buildings.
Exception number 2 to 403.2 of the North Carolina Plumbing code allows a unisex bathroom if the
occupant content is 25 people or less which includes employees and customers. If the occupant content
in a tenant space is over 25 people then 403.2 applies and separate facilities for men and women are
required and signage for each sex shall be required.
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1.
If a tenant space used as a medical office has an occupant content less than 25 people
(business occupancy) then only one unisex bathroom is required. The designer may add
additional bathrooms in the tenant space. All other bathrooms added can be unisex bathrooms
and shall be handicap accessible. Each shall have, as a minimum, one lavatory and one water
closet. If the bathroom is directly accessible from a private office then it shall be handicap
accessible or handicap adaptable. This shall not be considered a public bathroom; however, the
office space the bathroom serves may be deducted from the minimum facilities calculations
for the rest of the tenant space.
2. If the occupant content of a tenant space used as a medical office has an occupant content
greater than 25 people then 403.2 applies. At least one male and one female handicap
bathroom shall be provided and labeled male and female. Each bathroom shall have at least
one lavatory and one water closet. If additional facilities are required per table 403.1
calculations or if the designer wishes to install additional patient facilities they may be
considered unisex. See “All other……………………………………..tenant space” in
paragraph 1. Above. The same requirements apply for paragraph 2.
3. If facilities are calculated for the entire floor of the building in the core bathrooms then no
bathrooms are required in the medical office tenant spaces. Facilities provided may be unisex
and handicap accessible for any tenant space that chooses to provide additional facilities.
Private office facilities shall be the same as in the two paragraphs above.
If core facilities are provided that do not meet the minimum facility calculations for the entire floor
then each separate tenant space on that floor shall be calculated separately as stated in either paragraph
one or paragraph two above. No tenant space may “take credit” for the core facilities in calculating
their individual space minimum facilities. Ref: 403.2
9)
(Q)The minimum number of drinking fountains required for an office building is provided
in table 403.1. The designer has requested a substitution of 50 % of the drinking fountains
required with bottled water dispensers. One of the required drinking fountains that would
be substituted for a bottled water dispenser is in the private bathroom of one of the company
executives. Is this bottled water dispenser allowed in this location?
(A) No. Since it is a required drinking fountain it cannot be located in a private bathroom.
Bottled water dispensers are not allowed to be used unless they meet the requirements
of 1109.5.1 & 1109.5.2 of the North Carolina Building Code. The Building Code is more
stringent than the North Carolina State Plumbing Code so no bottled water dispensers
are allowed in any occupancy even if the minimum number of drinking fountains has
been exceeded. Ref: 410.1, 410.2(PC), 1109.5.1, 1109.5.2.1 (BC)
10) (Q) A very expensive Italian marble has been installed on all sides of a whirlpool tub in the
bathroom of a single family dwelling with no access to the pump. The inspector turned the
inspection down on a final sighting no pump access. The plumbing contractor then installed
an access panel in the floor under the tub in a crawl space and called for a re-inspection. Is
this access allowed by the code?
(A) Under certain conditions the inspector may pass the installation. The crawl space shall
be a minimum of 24 inches high, the access panel shall be at least 12 inches by 12 inches
unless the pump is more than 2 feet away from the access hole. If more than 2 feet
away the access opening then the access panel shall be 18 inches by 18 inches.
Ref: 421.5
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11) (Q) A manufacturing facility has heavy equipment arriving ahead of schedule. The contractor
re- permits the project to install the equipment in a section of the plant that cuts off
employee access to the minimum facilities. The installation of the equipment will take
about two months to complete to obtain a Certificate of Compliance. Can the contractor
bring in a temporary modular toilet facility and install them inside the building? Can the
existing facilities be used if the path of travel exceeds 500 feet if the path of travel is
protected from the new construction activity?
(A) A temporary facility may be installed in the building if it is the same construction type
as the building and provisions can be made to exhaust the bathrooms. The plumbing
official may approve a path or travel greater than 500ft. in factory and industrial
occupancies ONLY. Ref: 403.4.1 Exception
12) (Q) A designer has questioned whether a check cashing business is required to have
bathrooms accessible to the public? His client has several locations. The
other locations do not allow the public to use the bathrooms.
(A) This is a business occupancy per code. Fixtures are required per the code, however, the
tenant is not required to allow the public to use the facilities. The facilities are
required to be handicap accessible and shall be on an accessible route from the public
area inside the building. The business may allow members of the public to use the
facilities. If the tenant space has an occupant count of 25 or less per the building code a
unisex bathroom may be installed in lieu of male and female separate facilities.
Ref: Table 403.1, 403.2 exception 2.
13) (Q) The plumbing inspector checks a daycare and it appears to be short minimum facilities per
table 403.1. The contractor calls the Architect to check on the facilities count. The
Architect informs the inspector the daycare minimum facilities are based on the posted
occupant count which has been approved by the building official. Will the Architect
be required to add additional facilities?
(A) No. An interpretation from Department of Insurance would allow the fixture count to
be calculated per the posted number of people. Ref: 403.3, DOI interpretation
14) (Q) Is the plastic backing plate provided by a shower valve manufacturer, by itself, with no
connection to the structure, adequate support for a shower or tub and shower valve?
(A) No, unless the plate is listed for that application. Ref: 417.2
15) (Q) Are slip joint connections allowed in a sheetrock ceiling?
(A) Yes. Fixtures with concealed slip joint connections shall be provided with an
access panel or utility space at least 12 inches in its smallest dimension or other
approved arrangement so as to provide access to slip joint connections for inspection
and repair. Where such access cannot be provided, access doors shall not be
required, provided, that all joints are soldered, solvent cemented or screwed to form
a solid connection. 405.8
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16) (Q) Are terrazzo shower pans required to be identified with the manufacturers label and the
applicable standards on the pan itself? What standards should be listed on the pan?
(A) Yes. The shower pans should meet ASME A112.19.16. Ref: 417.1, 417.4
Chapter 5 Water Heaters:
1) (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
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 minimumThis 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.
3) (Q) What is the maximum temperature setting for a tankless water heater allowed for a
residential use only? What if temperature exceeds 140 degrees can the water heater still be
installed?
(A) 501.6 Maximum temperature is 140 degrees. 501.8 Where temperatures exceed 140
degrees a mixing valve shall be installed.
4)
(Q) A plumbing contractor “converted” a water heater from a 12 kW to an 18kW. The water
heater is located in the ceiling. It will be difficult for the inspector to observe the data plate
of the water heater. The new data plate reflecting the 18KW change has been added to
reflect the new heating capacity. The water heater now has dual (two) data plates. Is there
a problem with this installation change?
(A) Yes. Not allowed. The addition of a new data plate to the appliance negates the factory
listing/labeling of the appliance. The labels should be installed at the factory. From our
limited knowledge of this situation it sounds like a data plate has been taken from one
heater and added to another. Ref: Labeled by the Manufacturer, see def. 501.9
5)
(Q) 1. Does a point of use tankless water heater used for a sink require a drain pan and pan
discharge line to a floor or hub drain in a new building? 2. Several tank type point of use
water heaters sized between one and five gallons are installed in a new building.
Do the water heaters require a pan, drain and indirect drain within the room location?
3. Are the requirements similar for an existing building?
(A) 1. Yes. Per DOI all water heaters require a drain pan and drain to the point of
discharge.
2. Yes. The same as above.
3. Yes. Only if an available drain is readily accessible.
Ref: 504.7, 504.7.2
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6) (Q) A homeowner calls to question a water heater the contractor located in the middle of the
floor of the garage. They are having difficulty parking cars around the water heater. The
water heater is on the slab and has no drain pan. What are the code issues with this
installation?
(A) The plumbing contractor that installed the Water Heater told the homeowner no permit
was required. The Water Heater must be protected from the vehicle traffic. This is
“priority one” if the Water Heater is preventing parking cars in the garage. Ref: 502.5
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) The flow velocity of the water distribution system shall be controlled to reduce the
possibility of water hammer. A water-hammer arrestor shall be installed where quickclosing valves (clothes washers and dishwashers) and metallic piping is used. The waterhammer 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.
Ref: 604.9
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 waterheater installed in
the residence. An expansion device is not required if hot water distribution is from a
tankless water heater. Ref: 607.3
5) (Q) The Plumbing Code defines the "Water Supply System" and gives the point where the
Water service pipe terminates and becomes the water distribution pipe. When the water is
supplied by a well and not a meter what is the starting point of the service pipe inspection?
(A) The plumbing inspections begin at the valve at the outlet of the pressure tank. Ref:
602.3.5, 602.3.5.1
6) (Q) When and where are pressure-reducing valves required by code, and upon what
circumstances should the Inspectors be requiring them to be installed?
(A) When the incoming water pressure exceeds 80 PSI, and on the cold water line no further
downstream than the beginning of the water distribution system. Ref: 604.8
7) (Q) Past policies have required a expansion device installed on a closed water distribution
system where there is a tank style water heater and/or backflow prevention- is this still the
case?
(A) Yes Ref: 604.8.1, 504.4.1
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8) (Q) How should expansion tanks be supported?
(A) Per the tank manufacturers installation instructions. Ref: 607.3.2
9) (Q) Does the code allow a yard hydrant with a stop and waste that is fed from underground,
potable water, yard irrigation loop? The irrigation system is for a garden and not close to
any structure.
(A) No. The code does not allow a stop and waste on a potable water system. Any
underground opening represents a possibility of contamination through back siphon age
into the potable water system. Alternate approved method. A stop-and–waste may be
installed in the situation noted above if a reduced pressure backflow preventer on the
potable irrigation loop is installed and the piping is identified from the RP to the yard
hydrant as non-potable water. Non -potable piping must be painted yellow with black
lettering stating “NON POTABLE WATER”. Ref: 608.7, 608.8.2
Chapter 7 Sanitary Drainage:
(1) (Q). Can a force main tie into gravity drain line? If yes can a Y connection be used for
this purpose? What other requirements apply to meet code minimums?
(A) Yes. Must be 10 feet from the base of any soil stack, waste stack, or fixture drain
or the connection to a septic tank. Where the connection is to a horizontal drain
pipe the ejector shall be made on top of the drain pipe through a wye fitting at an
angle of 45 deg. Ref: 712.3.5
2) (Q) A plumbing contractor wants to use saddle valves to tap a live 6 inch main. The approval is
based on an engineer approved letter of approval for use of the valve as an alternate
method. Is this allowed?
(A) No. Saddle valves are clearly prohibited by the code. Ref: 707.1 #6
3)
(Q) Is the flexible drain line piping approved for under sink waste piping?
(A) No. Flexible drain piping, sold at most of the big box stores, is not approved by the NC
Plumbing Code. The fittings shall not have ledges, shoulders or reductions capable of
retarding or obstructing flow in the piping. Threaded drainage pipe fittings shall be of
the recessed drainage type. Ref: 706.2
4)
(Q) The plumbing inspector has turned down a forced sewer because the cleanouts are not
spaced properly per code. The contractor says the cleanouts on the force sewer are
optional and he does not have to meet the clean out spacing requirements. Is the
contractor correct?
(A ) Yes. The code is silent on cleanouts for forced sewers. The addition of cleanouts is
optional and therefore the cleanout spacing is optional. Ref: DOI interpretation per
State Mechanical Engineer.
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5)
(Q) 1. ABS and PVC DWV pipe normally has a warp or a bend. When
inspecting an inground installation, should the warp or bend be pointed up,
down, or to the side?
(A) The warp should be to the side in order to support the length of the pipe and
to maintain a uniform grade. Ref: 704.1
6)
(Q) Can a Fernco coupling be used underground to join like materials.
Example: ABS to ABS or is it required to be used only as a transition fitting?
(A) Yes. A Fernco coupling may be used in the application listed above. Ref: 706.1
7)
(Q) Can a sewer/building drain two- way cleanout be used as the clean out for the base of the
stack if it is installed vertically and directly connected to the main building drain?
(A) Yes. The cleanout on the vertical stack may be used as the clean out at the base of the
sewer/building drain. Ref: 708.3, 708.5
(8) (Q) Are pro set pipe joints allowed under slabs?
(A) Yes. See manufacturer’s data. Ref: 702.2
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. Ref: 803.4
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?
(A) 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.
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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
5) (Q) Is a condensate pump that is not listed for installation in a plenum allowed in a plenum if it
has all non –combustible parts?
(A) Yes. (307.2.1, 307.2.2 Mech. Code) The plumbing official may allow the use of this pump
as an equivalency to a listed pump under the conditions stated above. Ref: 801.1
Chapter 9 Vents:
1)
(Q) When a floor drain or a floor sink receives the discharge from an espresso or
soda machine, the drain must be individually vented. Correct?
(A) No. Espresso and soda machines are not fixtures, they are pieces of
equipment. Therefore the indirect waste receptor serving those devices shall be
trapped and may be primed but not individually vented. The term "fixture"
means a sink type fixture only which is required to have an indirect drain
Examples would be a food prep sink, vegetable or fruit prep sink or a meat prep
sink. As long as the floor sink/drain trap is installed as part of a properly vented
combination waste and vent system an individual vent is not required. Ref: 912.2.4
Chapter 10 Traps, Interceptors & Seperators:
1) (Q) What is required for laundry drain protection for lint, buttons or strings?
(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. Ref: 1003.6
2) (Q) Is a separate draw off storage tank allowed to be installed as part of an oil/water separator
installation?
(A)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
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other requirements for oil/water separators installed in Mecklenburg County shall
remain the same. Ref: 1003.1, 1003.2, 1003.4, & 1003.4.2
3)
(Q) Grease interceptors that are required by the plumbing code and by Charlotte
Mecklenburg Utility Department should be designed to meet both standards. The
utility company would like Mecklenburg County to alter its policy statement. Is
there any reason we should not honor that request?
(A) No. Unless the change is a violation of current code we can honor their request. They
would like us to add the access provision to our requirements. This standard provision
would require access to each chamber separately of a grease interceptor. Out policy will
be revised to reflect this change. Ref: 1003.3
4)
(Q) The plumbing plans examiner has turned down a plan requiring a system of floor drains
or trench drains in a repair garage that will have to discharge through an oil/water
separator. The owner calls the CA to find out if he may use dry clean up and
environmental disposal of waste just like the garage next door to his has for years?
(A)If the owner does not have floor drains or trench drains and uses dry clean up and
proper environmental disposal methods per our on line OWS interpretation, I see no
reason to require the OWS. I would always advise checking the plans to get the overall
picture of the project. We may not be getting the whole picture. If there are existing
floors or trench drains in the original building they are adding on to then the new floor
and trench drains should be added to the original drain installation and the OWS sized
to accommodate all the waste from the garage floor. We need to get a letter from the
owner about the pick up and disposal of the dry clean up material Ref: Oil Water
Separator Policy letter on our web site. Ref: 1003.4 exception
5)
(Q) Does a fire sprinkler equipment room that is required to have an annual test blow down
require a properly sized drain to sanitary sewer or can it go to the storm sewer?
(A) When you have an RP dump discharge water in an equipment room an opening in the
exterior wall at grade level or a pipe sleeve used to channel emergency over flow outside
the building my typically be used for blow down water. That water flows to the storm
drain. Neither the plumbing plan examiners nor the fire plans examiners have ever
required any type of oil water separator based on the possibility the fire line would
discharge oil and/or chemicals into the storm or sanitary sewer system. Separators are
not required. Any quantity of oil or chemicals in the waste water would be minute and
diluted. The discharge can go to either the storm or the sanitary sewer system. No
separator is required. . Ref: 1003.2.
6)
(Q) A residential washing machine is installed as part of the restaurant equipment without a
separate lint interceptor. The designer shows the plans examiner the integral lint
interceptor information supplied by the manufacturer. The washing machine is only used to
wash hand towels. Is a separate lint interceptor required?
(A) No. It is determined the washing machine is used for minimal washing of hand towels
and has an integral lint filter therefore a separate lint interceptor is not required.
Ref: 1003.6
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NC Plumbing Code 2011
Attention:  Denotes a new question from the previous month!
 Denotes a revised/revisited question.
September 2011
(7) (Q) Under what conditions would we accept concrete grease interceptors in Mecklenburg
County?
(A) (1) It shall have a capacity equal to or greater than 500 gallons storage capacity.
(2) It shall be installed outside the building. (3) The interceptor shall be delivered on site
as a complete unit and require no field fabrications or modifications. (4) It shall be
clearly marked with the manufacturers name and the standards to which they comply.
(5) An engineer (registered in the state of North Carolina) is responsible for proper
sizing of the grease interceptor. Ref: 1003.3
Chapter 11 Storm Drainage:
1) (Q) How do vertical walls affect roof drain calculations?
(A) 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. Ref: 1106.4
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?
(A) 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
3) (Q) Is it still applicable to use the 3.2” and 6.6” rainfall amounts for primary and secondary
roof drain quantities? These values were in the table approved by Phil Edwards for
rainfall as long as we noted on the plans that we used those totals? It has been about 8-12
months since I last checked.
(A) Yes. You can still use either the NC Plumbing Code calculations or CMUD data. It is the
designers’ choice as long as the code tables do not contain a lesser value than local
weather conditions. The rainfall amounts in your email are from CMUD data and would
still apply for local rainfall amounts used in your calculations. Ref: 1106.1
4) (Q) What should the maximum drain size be for a swimming pool drain terminating in a CMUD
manhole? Maximum drains from the manhole are typically 4 inch.
(A) CMUD (the utility) is consistently having manhole flooding problems. The problem
arises when a 6 inch pool drain discharges into a utility manhole that has 4 inch
maximum utility drains. CMUD wants to eliminate this costly problem by requiring a
maximum drain size of 4 inches for all pool drains. In order to resolve the problem and
reduce flooding problems we will require the maximum drain size from a pool to the
utility manhole to be 4 inch. Larger pools, example: (Olympic size pools.) We will
increase the drain size when the utility connection can handle the larger drain size from
the pool.
12
Quarter 3
Land Use and Environmental Service Agency
(Code Enforcement)
NC Plumbing Code 2011
Attention:  Denotes a new question from the previous month!
 Denotes a revised/revisited question.
September 2011
POLICY/ADMINISTRATION:
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.
3) (Q) I’ve received a complaint on one of our child care centers and apparently the center’s
sewage grinder tank does not work properly, to the point that the center has their tank
pumped weekly or whenever the tank’s alarm goes off. The tank overflows into the
adjacent playground/parking lot. I’m planning to visit the facility and advise them that the
sewage cannot flow onto the ground and that their sewage system must work properly. That
being said, the caller also advised that the grinder in the tank was not adequate when it was
installed. As far as the effectiveness of the grinder tank, will the issue fall under Code
Enforcement?
(A) We do not get involved with the performance of the pump; it comes down to “Does the
pump/tank operate as designed?” It goes back to the installing contractor- he/she is liable
for the design/installation/performance of the equipment. If I were the tenant, I would call
the installing contractor and have them check on why it did not work as designed.
4) (Q) 21 NCAC 50 .0505 (NC Administrative Code)
The general supervision required by G.S. 87-26 is that degree of supervision
which is necessary and sufficient to ensure that the contract is performed in a
workmanlike manner and with the requisite skill and that the installation is
made properly, safely and in accordance with applicable codes and
rules. General supervision requires that review of the work done pursuant to the
license be performed by a licensee of the firm while the work is in progress.
What are the requirements per the North Carolina Plumbing, Heating, and Fire Sprinkler
Contractors licensing laws?
(A) **Contractors must immediately inform the board that he/she is no longer the
qualifier and all work must cease** The contractors Mecklenburg County account will be
put into an “H” status which will prevent the contractor from obtaining permits until he
has a new qualifier.
13
Quarter 3
Land Use and Environmental Service Agency
(Code Enforcement)
NC Plumbing Code 2011
Attention:  Denotes a new question from the previous month!
 Denotes a revised/revisited question.
September 2011
5)
(Q) A domestic water heater replacement was installed in a crawl space on its side because of
clearance problems. The homeowner complained to the department that she has had no hot
water in her kitchen since the water heater was installed. The homeowner also contacted the
contractor who told her a permit was not required to install a water heater. What should the
department do to resolve the problem? Does the contractor have to get a permit for this
work?
(A) Inspections must create an RQ to inspect the work. They should instruct the
homeowner to contact the State Plumbing, Heating and Fire Sprinkler Contractor Board
if they wish to file a complaint against the licensed contractor. Inspections will triple fee
the licensed contractor and notify him of the need for a permit and inspection.
6)
(Q) Is a plumbing license required to replace a shower liner? Does the replacement require a
permit?
(A) Yes. A plumbing license is required. Yes. A permit is required. Per DOI – Henry
Webster
7)
(Q) Does a NC state plumbing license cover the installation of a vent for a gas fired water
heater?
(A) Yes. Per John Taderro, investigator for the North Carolina Plumbing, Heating, and
Fire Sprinkler Contractor Licensing Board.
8)
(Q) What are the goals of the TAB (Technical Advisory Board) as an arm of the BDC
( Building Development Commission)?
(A) The Technical Advisory Board (TAB) is made up of members of the design community,
the utility, and the Code Enforcement CA’s. The goal of the committee is to assist the
design community in their efforts to install equipment and systems that qualify as
sustainable design features of a building and are in compliance with the minimum codes.
14
Quarter 3
Land Use and Environmental Service Agency
(Code Enforcement)
NC Plumbing Code 2011
Attention:  Denotes a new question from the previous month!
 Denotes a revised/revisited question.
September 2011
15
4rth
3rd
2nd
1st
Color code below denotes the calendar year quarter of each question listed
above. Tan, Blue, Green, Red
Quarter 3
Land Use and Environmental Service Agency
(Code Enforcement)
Mecklenburg County
Code Enforcement
Temporary Utility
Services
In order to
make this
type of
request
…….You must have these types of Approved Inspections!
Type of
Request
Building,
Plumbing,
Fire
Electrical
Temporary
Electrical
(1)
Any stage of
completion
Temporary (TP)
or Final
Electrical
Any stage of
completion
Any stage of
completion
Temporary
Heat
(1),( 2 )
Any stage of
completion
Temporary (TP)
or Final
Electrical
Temp. Heat
(TH)
Or Final
Any stage of
completion
Temporary
Certificate of
Occupancy
(TCO)
TCO or Final
Inspection
TCO or Final
Inspection
TCO or Final
Inspection
All other agencies must have
final inspection.
Mechanical
Other
Agencies
(Health, etc)
(1) Multiple Permits/Contractors MAY need equal Inspection Status
(2) For residential use structures, (i.e., apartments, condominiums, townhomes, duplexes and singlefamily homes) temporary heat ONLY is available prior to TCO/final inspection of all permits. All other
appliances/devices shall be disconnected during “Temp Heat.” For Commercial structures, there are no
restrictions. Gas for Code required testing is available on a case-by-case basis.
Note:
Application for temporary utilities will be accepted ONLY after the requirements for temporary
power or temporary heat have been met. (See chart above)
Rev 8/1/11
TEMPORARY UTILITY SERVICE
(ELECTRIC, GAS OR BOTH)
APPLICATIONS FOR TEMPORARY POWER (TP) AND/OR HEAT (TH) WILL NOT BE ACCEPTED UNTIL
THE INSPECTOR HAS APPROVED THE PERMIT FOR TEMPORARY SERVICE AND ALL THE REQUIRED SIGNATURES OF THE SUB-CONTRACTORS HAVE BEEN OBTAINED. TEMPORARY POWER
AND/OR HEAT SHOULD BE COORDIANTED PRIOR TO FINAL INSPECTIONS.
REQUIREMENTS:
TEMPORARY POWER (TP)
The signatures of ALL sub-contractors listed on the permit list of that job are required on the application form. The
permit(s) must be approved by the electrical inspector for temp power (TP), Temporary CO or final. The electrical
contractor must make the request for inspection with the Inspections Division. Steps required for temporary power:
1) The building shall be secure and capable of being locked from unauthorized entry and supervised
(door, windows, other entrances, etc.); 2) All rooms containing service, feeder, and branch circuit panels
must be capable of being locked and be supervised; 3) Metal water pipe systems must be connected to
the provided utility system, if applicable; 4) All wiring to be energized must be free from any hazard
that may arise due to its use; 5) Before any wiring system can be energized, it must be in full compliance
with the applicable requirements of the NC Electrical Code and pass inspection.
TEMPORARY HEAT (TH)
If only GAS service is requested, the only sub-contractor signature required on the application will be that of the
Mechanical Contractor. The permit(s) must be approved by the mechanical inspector for temporary heat (TH). The
mechanical contractor must make a request for inspection (TH) with the Inspections Division before TCO or CO
phase. The electrical permit must be approved for temporary power, final or temporary occupancy. Temporary gas
for code required equipment inspections approved on a case by case basis (such as restaurant hood test or back up
gas generators). Steps required for Temporary Heat:
1) Set Unit; 2) Vented (gas); 3) Gas Piped (gas); 4) Provide with proper combustion air, if required;
5) Provided with proper gas test (gas); 6) Cap or plug all gas pipe outlets not connected to furnace; 7)
Complete duct system; 8) Provide air filter; 9) Secure structure (lockable doors/windows).
NOTE: All installations must comply with the NC State Codes and Manufacturers’ Instructions.
There will be a $100.00 charge for each utility service requested and renewals for each job location.
Temporary power and/or heat are granted for a period of 90 days. Automatic Renewals, if approved, will be for 90
days with a charge of $100 for each utility service needed.
GENERAL QUESTIONS:
Document Control (704)336-3830
PEOPLE ● PRIDE ● PROGRESS ● PARTNERSHIPS
700 North Tryon Street Charlotte, North Carolina 28202 Phone (704) 336-3821 Fax (704) 336-3839
www.meckpermit.com
MECKLENBURG COUNTY
Land Use and Environmental Services Division
Code Enforcement
Memo
Date:
To:
From:
Re:
July 11, 2011
All customers
Jim Bartl, Director of Code Enforcement
2012 NC State Building Code Effective Dates
In the June 14 meeting of the NC Building Code Council (BCC), the Council confirmed the transition dates for the
new 2012 NC State Building Code family. While the BCC set a constant effective date for all codes except
electric, the transition period varies as follows:
• The 2012 NC Building, Fire Prevention, Mechanical, Plumbing and Fuel Gas Codes will have a
transition period of September 1, 2011 through March 1, 2012.
• The 2012 NC Residential Code and NC Energy Conservation Code will have a transition period of
January 1, 2012 through March 1, 2012.
Regarding the 2011 NC Electrical Code, ten letters of objection were filed with the NC Rule Review
Commission, which automatically throws the issue into the NC General Assembly’s 2012 session.
Consequently, we will continue using the 2008 edition of the NC Electrical Code, and we do not anticipate a
switch to the 2012 NC Electrical Code until summer 2012, if even at that time.
It is also important to note that, the 2012 NC Residential Code will include residential requirements for electrical,
mechanical and plumbing trade installations (whereas previous NC Residential Codes referenced the individual
electrical, mechanical and plumbing codes). Customers with permits issued through March 1, 2012, under the
2009 NC Residential Code will continue to refer to the 2009 NC Mechanical Code, 2009 NC Plumbing Code and
2008 NC Electrical Code, as in the past.
Regarding the absolute cutoff date for use of the 2009 NC State Building Code family, given the long transition
periods and the lengthy advance notice provided by the BCC, we see no reason to extend this with an additional
grace period beyond March 1, 2012. Consequently, permits issued after March 1, 2012 must comply with the 2012
NC State Building Code family (except as noted above regarding the electrical code).
It is very important that professionals closely monitor their work to carefully determine when a project’s design
basis must switch to the new 2012 NC State Building Code family to comply with the above transition periods and
the Department’s policy regarding same. While state law requires the Department to issue a permit on any project
in compliance with the effective code, the burden is on the owner’s team to estimate when your permit will be
issued. Projects not permitted by March 1, 2012 must comply with the 2012 NC State Building Code family,
regardless of when they entered the system for permitting.
Feel free to contact me, Directors Gene Morton or Patrick Granson, plan review managers, field inspection
managers, or the Code Administrators if you have questions on the effective dates of the 2012 NC State Building
Code family.
PEOPLE • PRIDE • PROGRESS• PARTNERSHIPS
700 North Tryon Street • Charlotte, North Carolina • (704) 336-3830 • Fax (704) 336-3839
www.meckpermit.com
MECKLENBURG COUNTY
Land Use & Environmental Services Agency
Code Enforcement
October 11, 2011
Re:
Temporary Utilities on Construction Sites
Dear Customer,
This letter summarizes our procedures regarding the application for and use of Temporary
Utilities on construction sites. Periodically, we have found it is appropriate to review those
procedures and field any questions you may have.
Commercial and Residential customers may now apply for Temporary Utilities at any stage of
the construction process as long as services and systems are found to be safe.
Gas Temporary Utility is only for heating equipment, with no other appliances allowed.
Electrical Temporary Utilities required eight items to be addressed, as specified in the NC
Electrical Code.
For complete details please see the attached chart or go to the following links on our website:
http://www.charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/
PublicRecords-Documents/Pages/Temp%20Utilities.aspx
Please note temporary utilities may only be issued after passing a Temporary Power
inspection or Final inspection. Also, note that upon passing inspection, the applicant must
submit a request for Temporary Utility application (on our website at www.meckpermit.com
under forms) in person, with the form filled out and signed by all parties, including all
subcontractors and the owner’s signature must be notarized. Further note that this form states
that occupancy is not allowed.
Should you have any questions on the foregoing, please feel free to contact the Administration
Support Team at 704-336-3830.
Yours truly,
Sincerely,
James N. Bartl, AIA
Director of Code Enforcement
JB:klb
PEOPLE • PRIDE • PROGRESS • PARTNERSHIPS
700 North Tryon Street • Charlotte, North Carolina 28202 • (704) 336-3545 Fax (704) 319-9525
www.meckpermit.com
MECKLENBURG COUNTY
Land Use & Environmental Services Agency
Code Enforcement
October 11, 2011
Re:
Temporary Utilities on Construction Sites
Dear Customer,
This letter summarizes our procedures regarding the application for and use of, Temporary Utilities on
construction sites. We have found that, periodically, it is appropriate to review those procedures and
field any questions you may have.
Residential Construction
Applications are made on an “as needed” basis. Temporary utilities are approved between October 1 and
April 1. Inspections must be completed in advance of submitting the temporary utility application.
Commercial Construction
Applications may be made year-round. Again, applications are made on an “as needed” basis and
inspections must be completed in advance of submitting the temporary utility application. To clarify the
different temporary utility conditions, we have developed a summary chart of request type and related
inspections required. (A copy of the chart is on the reverse side of this letter.)
Please note temporary utilities may only be issued prior to passing final
inspections. After final inspections are passed a Temporary Certificate of
Occupancy (TCO) must be sought rather than a Temporary Utility Authorization.
Also, please note that in either case (residential or commercial) application may be made by fax:
704.336.4096, but you must include a letter authorizing charge of the temporary utility to your contractor
account number. Applications without this authorization will be refused.
Should you have any questions on the foregoing, please feel free to contact any of the following:
•
Lon McSwain, Building Code administrator (704.336.4302)
•
Joe Weathers, Electrical Code Administrator (704.336.5379)
•
Willis Horton, Mechanical/Plumbing Administrator (704.336.4301)
•
Document & Inspections (704.336.3830)
Yours truly,
Jim Bartl, AIA
Director of Code Enforcement
JB:klb
PEOPLE • PRIDE • PROGRESS • PARTNERSHIPS
700 North Tryon Street • Charlotte, North Carolina 28202 • (704) 336-3545 Fax (704) 319-9525
www.meckpermit.com
MECKLENBURG COUNTY
LAND USE & ENVIRONMENTAL SERVICES
CODE ENFORCEMENT
Temporary Utility Services
In order to
make this type
of request
……You must have these types of approved inspections!
Type of
Request
(Below)
Temporary
Electrical
Power
BUILDING
ELECTRICAL
MECHANICAL
PLUMBING
OTHER
AGENCIES
Any Stage of
Completion
Temporary Power
(TP) Inspection
Only
Any Stage of
Completion
Any Stage of
Completion
Any Stage of
Completion
Any Stage of
Completion
Temporary Power
(TP)
or
Temporary CO
(TCO)
Temporary Gas
(TH) Temporary
CO
or
Final Inspection
Any Stage of
Completion
Any Stage of
Completion
Temporary
CO
or
Final
Inspection
Temporary CO or
Final Inspection
Temporary CO
or
Final Inspection
Temporary CO
or
Final Inspection
Temporary CO
or
Final Inspection
** #
*
Temporary
Gas
** #
Temporary
Certificate of
Occupancy
(TCO)
*
**
#
Note:
A TCO must be obtained in order to get utilities for Final electrical inspections
Multiple Permits MAY need equal inspection status
Temporary Utilities for residential available ONLY from October 1 through March 31
Application for temporary utilities will be accepted ONLY after the requirements for temporary
power or temporary heat have been met. (See chart above)
Please fax your temporary utility application and letter authorizing these charges to your
account to 336-4096. To ensure proper billing please include your contractor account number.
G:\LDCR\Code Consistency Qrtly Rpts\2011\3rd Qtr July - Sept\Temp Utilities Fall 2011.Doc
PEOPLE • PRIDE • PROGRESS • PARTNERSHIPS
700 North Tryon Street • Charlotte, North Carolina 28202 • (704) 336-3827 Fax (704) 336-3839
www.meckpermit.com