[Ord. No. 17-061 § 7, 7-5-2017; Ord.
No. 23-102, 11-13-2023]
St. Charles County hereby adopts the 2020 National Fire Protection
Association 70 — National Electric Code, a copy of
which shall be deposited in the Office of the County Registrar with
this ordinance, with the following amendments by additions, insertions,
deletions and changes so that such Sections and Subsections read as
follows:
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(ARTICLE 90 INTRODUCTION)
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90.1(D) Administration of this code. The administration of this code shall be in accordance with Appendix K "Administrative Provisions" of the Building Code adopted in Section 500.100.
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(CHAPTER 2 WIRING AND PROTECTION)
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(ARTICLE 210 BRANCH CIRCUITS)
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210.8(A) Dwelling Units. All 125-volt through 250-volt
receptacles installed in the locations specified in 210.8(A)(1) through
(A)(11) and supplied by single-phase branch circuits rated one hundred
fifty (150) volts or less to ground shall have ground-fault circuit-interrupter
protection for personnel.
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(1)
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Bathrooms.
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(2)
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Garages and also accessory buildings that have a floor located
at or below grade level not intended as habitable rooms and limited
to storage areas, work areas, and areas of similar use.
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Exception to (2): For one- and two-family dwellings
and townhouses, garage door opener receptacles not installed in a
readily accessible location.
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(3)
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Outdoors.
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Exception to (3): Receptacles that are not readily
accessible and are supplied by a branch circuit dedicated to electric
snow-melting, deicing, or pipeline and vessel heating equipment shall
be permitted to be installed in accordance with 426.28 or 427.22,
as applicable.
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(4)
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Crawl spaces — at or below grade level.
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(5)
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Basements.
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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.
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Informational Note: See 760.41(B) and 760.121(B)
for power supply requirements for fire alarm systems.
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Receptacles installed under the exception to 210.8(A)(5)
shall not be considered as meeting the requirements of 210.52(G).
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(6)
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Kitchens — where the receptacles are installed to serve
the countertop surfaces.
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(7)
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Sinks — where receptacles are installed within one and
eight-tenths (1.8) m (6 ft) from the top inside edge of the bowl of
the sink.
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(8)
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Boathouses.
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(9)
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Bathtubs or shower stalls — where receptacles are installed
within eight-tenths (1.8) m (6 ft) of the outside edge of the bathtub
or shower stall.
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(10)
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Laundry areas.
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Exception to (1) through (3), (5) through (8), and (10): Listed
locking support and mounting receptacles utilized in combination with
compatible attachment fittings installed for the purpose of serving
a ceiling luminaire or ceiling fan shall not be required to be ground-fault
circuit-interrupter protected. If a general-purpose convenience receptacle
is integral to the ceiling luminaire or ceiling fan, GFCI protection
shall be provided.
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(11)
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Indoor damp and wet locations.
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210.12(A) Dwelling Units. All 120-volt, single-phase,
15- and 20-ampere branch circuits supplying outlets or devices installed
in dwelling unit kitchens, family rooms, dining rooms, living rooms,
parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets,
hallways, laundry areas, or similar rooms or areas shall be protected
by any of the means described in 210.12(A)(1) through (6):
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Exception: For one- and two-family dwellings and
townhouses, protection is not required in laundry areas and similar
rooms or areas.
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(1)
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A listed combination-type arc-fault circuit interrupter installed
to provide protection of the entire branch circuit.
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(2)
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A listed branch/feeder-type AFCI installed at the origin of
the branch-circuit in combination with a listed outlet branch-circuit-type
arc-fault circuit interrupter installed at the first outlet box on
the branch circuit. The first outlet box in the branch circuit shall
be marked to indicate that it is the first outlet of the circuit.
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(3)
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A listed supplemental arc protection circuit breaker installed
at the origin of the branch circuit in combination with a listed outlet
branch-circuit type arc-fault circuit interrupter installed at the
first outlet box on the branch circuit where all of the following
conditions are met:
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a.
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The branch-circuit wiring shall be continuous from the branch-circuit
overcurrent device to the outlet branch-circuit arc-fault circuit
interrupter.
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b.
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The maximum length of the branch-circuit wiring from the branch-circuit
overcurrent device to the first outlet shall not exceed fifteen and
two-tenths (15.2) m (50 ft) for a 14 AWG conductor or twenty-one and
three-tenths (21.3) m (70 ft) for a 12 AWG conductor.
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c.
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The first outlet box in the branch circuit shall be marked to
indicate that it is the first outlet of the circuit.
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(4)
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A listed outlet branch-circuit-type arc-fault circuit interrupter
installed at the first outlet on the branch circuit in combination
with a listed branch-circuit overcurrent protective device where all
of the following conditions are met:
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a.
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The branch-circuit wiring shall be continuous from the branch-circuit
overcurrent device to the outlet branch-circuit arc-fault circuit
interrupter.
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b.
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The maximum length of the branch-circuit wiring from the branch-circuit
overcurrent device to the first outlet shall not exceed fifteen and
two-tenths (15.2) m (50 ft) for a 14 AWG conductor or twenty-one and
three-tenths (21.3) m (70 ft) for a 12 AWG conductor.
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c.
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The first outlet box in the branch circuit shall be marked to
indicate that it is the first outlet of the circuit.
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d.
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The combination of the branch-circuit overcurrent device and
outlet branch-circuit AFCI shall be identified as meeting the requirements
for a system combination-type AFCI and shall be listed as such.
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(5)
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If metal raceway, metal wireways, metal auxiliary gutters, or
Type MC, or Type AC cable meeting the applicable requirements of 250.118,
with metal boxes, metal conduit bodies, and metal enclosures are installed
for the portion of the branch circuit between the branch-circuit overcurrent
device and the first outlet, it shall be permitted to install a listed
outlet branch-circuit-type AFCI at the first outlet to provide protection
for the remaining portion of the branch circuit.
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(6)
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Where a listed metal or non-metallic conduit or tubing or Type
MC cable is encased in not less than fifty (50) mm (2 in.) of concrete
for the portion of the branch circuit between the branch-circuit overcurrent
device and the first outlet, it shall be permitted to install a listed
outlet branch-circuit-type AFCI at the first outlet to provide protection
for the remaining portion of the branch circuit.
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Exception: AFCI protection shall not be required for an individual
branch circuit supplying a fire alarm system installed in accordance
with 760.41(B) or 760.121(B). The branch circuit shall be installed
in a metal raceway, metal auxiliary gutter, steel-armored cable, Type
MC or Type AC, meeting the applicable requirements of 250.118, with
metal boxes, conduit bodies, and enclosures.
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Informational Note No. 1: For information on combination-type
and branch/feeder-type arc-fault circuit interrupters, see UL 1699-2011,
Standard for Arc-Fault Circuit Interrupters. For information on outlet
branch-circuit type arc-fault circuit interrupters, see UL Subject
1699A, Outline of Investigation for Outlet Branch Circuit Arc-Fault
Circuit-Interrupters. For information on system combination AFCIs,
see UL Subject 1699C, Outline of Investigation for System Combination
Arc-Fault Circuit Interrupters.
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Informational Note No. 2: See 29.6.3(5) of NFPA
72-2013, National Fire Alarm and Signaling Code, for information related
to secondary power-supply requirements for smoke alarms installed
in dwelling units.
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Informational Note No. 3: See 760.41(B) and 760.121(B)
for power-supply requirements for fire alarm systems.
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(D)
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Branch circuit extensions or modifications — dwelling
units, dormitory units, and guest rooms and guest suites. Where
branch circuit wiring for any of the areas specified in 210.12(A),
(B), or (C) is modified, replaced, or extended, the branch circuit
shall be protected by one (1) of the following:
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(1)
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By any of the means described in 210.12(A)(1) through (A)(6).
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(2)
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A listed outlet branch-circuit-type AFCI located at the first
receptacle outlet of the existing branch circuit.
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Exception No. 1: AFCI protection shall not be required
where the extension of the existing branch circuit conductors is not
more than one and eight-tenths (1.8) m (6 ft) and does not include
any additional outlets or devices, other than splicing devices. This
measurement shall not include the conductors inside an enclosure,
cabinet, or junction box.
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Exception No. 2: For one- and two-family dwellings
and townhouses, AFCI protection shall not be required where the extension
of the existing branch circuit conductors is not more than nine and
five-tenths (9.5) m (30 ft) and does not include any additional outlets
or devices, other than splicing devices. This measurement shall not
include the conductors inside an enclosure, cabinet, or junction box.
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(ARTICLE 230 SERVICES)
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230.85 Emergency disconnects. Delete Section in
its entirety.
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(CHAPTER 4 EQUIPMENT FOR GENERAL USE)
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(ARTICLE 406 RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS
(CAPS))
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406.12 Tamper-Resistant Receptacles. All 15- and
20-ampere, 125- and 250-volt non-locking-type receptacles in the areas
specified in 406.12(1) through (8) shall be listed tamper-resistant
receptacles.
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(1)
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Dwelling units, including attached and detached garages and
accessory buildings to dwelling units, and common areas of multifamily
dwellings specified in 210.52 and 550.13.
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(2)
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Guest rooms and guest suites of hotels, motels, and their common
areas.
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(3)
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Child care facilities.
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(4)
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Preschools and education facilities.
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(5)
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Business offices, corridors, waiting rooms and the like in clinics,
medical and dental offices, and outpatient facilities.
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(6)
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Subset of assembly occupancies described in 518.2 to include
places of awaiting transportation, gymnasiums, skating rinks, and
auditoriums.
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(7)
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Dormitory units.
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(8)
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Assisted living facilities.
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Informational Note No. 1: This requirement would include receptacles
identified as 5-15, 5-20, 6-15, and 6-20 in ANSI/NEMA WD 6-2016, Wiring
Devices — Dimensional Specifications.
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Informational Note No. 2: Assisted living facilities are Institutional
Use Group I-1 per IBC 2015.
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Exception No. 1 to (1): This shall not apply to
one- and two-family dwellings and townhouses.
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Exception No. 2 to (1), (2), (3), (4), (5), (6), (7) and
(8): Receptacles in the following locations shall not be required
to be tamper resistant:
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(1)
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Receptacles located more than one and seven-tenths (1.7) m (5 1/2
ft) above the floor.
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(2)
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Receptacles that are part of a luminaire or appliance.
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(3)
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A single receptacle, or a duplex receptacle for two (2) appliances,
located within the dedicated space for each appliance that, in normal
use, is not easily moved from one (1) place to another and that is
cord-and-plug-connected in accordance with 400.10(A)(6), (A)(7), or
(A)(8).
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(4)
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Non-grounding receptacles used for replacements as permitted
in 406.4(D)(2)(a).
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