1. Flexible Cords and Cables
400.4 Types
Flexible cords and flexible
cables shall conform to the
description in Table 400.4. The
use of flexible cords and
flexible cables other than those
in Table 400.4 shall require
permission by the authority
having jurisdiction.
2. Flexible Cords and Cables
400.7 Uses Permitted
(A) Uses . Flexible cords and cables shall be used only for
the following:
(11) Between an existing receptacle outlet and an inlet,
where the inlet provides power to an additional single
receptacle outlet. The wiring interconnecting the inlet
to the single receptacle outlet shall be a Chapter 3
wiring method. The inlet, receptacle outlet, and Chapter
3 wiring method, including the flexible cord and
fittings, shall be a listed assembly specific for this
application.
3. Receptacles, Cord Connectors,
and Attachment Plugs (Caps)
406.5 Receptacle Mounting
Receptacles shall be mounted in identified boxes or
assemblies. The boxes or assemblies shall be securely
fastened in place unless otherwise permitted elsewhere in
this Code. Screws used for the purpose of attaching
receptacles to a box shall be of the type provided with a
listed receptacle, or shall be machine screws having 32
threads per inch or part of listed assemblies or systems, in
accordance with the manufacturer’s instructions.
4. Receptacles, Cord Connectors,
and Attachment Plugs (Caps)
406.12 Tamper-Resistant Receptacles
Tamper-resistant receptacles shall be installed as
specified in 406.12(A) through (C).
(A) Dwelling Units. In all areas specified in 210.52, all nonlocking-type 125-
volt, 15- and 20-ampere receptacles shall be listed tamper-resistant receptacles.
(B) Guest Rooms and Guest Suites of Hotels and Motels. All nonlocking-
type 125-volt, 15- and 20-ampere receptacles located in guest rooms and guest
suites of hotels and motels shall be listed tamper-resistant receptacles.
(C) Child Care Facilities. In all child care facilities, all nonlocking-type 125-
volt, 15- and 20-ampere receptacles shall be listed tamper-resistant receptacles.
5. F.Y.I.
Statistics from 2005 indicated that approximately 89 percent of
electrical burn and shock incidents occurred among children 6 years
of age or less. The requirements for tamper-resistant receptacles
ensure that children will be protected in all types of environments
— in closely supervised areas, such as pediatric care locations and
child care facilities, and in less structured, residential environments.
Tamper-resistant construction provides the most effective and
permanent means of preventing children from inserting foreign
objects into receptacles. These receptacles are recognized in the
U.S. General Services Administration (GSA) Child Care Center
Design Guide (PBS100--July 1993) as a critical design feature for
child care areas.
6. Receptacles, Cord Connectors,
and Attachment Plugs (Caps)
406.15 Dimmer-Controlled
Receptacles
A receptacle supplying lighting
loads shall not be connected to
a dimmer unless the
plug/receptacle combination is
a nonstandard configuration
type that is specifically listed
and identified for each such
unique combination.
7. Luminaire Locations
410.10(F) Luminaires Installed in or Under
Roof Decking.
Luminaires installed in exposed or concealed
locations under metalcorrugated sheet roof
decking shall be installed and supported so there is
not less than 38 mm (11⁄2 in.) measured from the
lowest surface of the roof decking to the top of
the luminaire.
8. Lighting Systems Operating at 30 Volts
or Less and Lighting Equipment
Connected to Class 2 Power Sources
411.1 Scope
This article covers
lighting systems
operating at 30 volts
or less and their
associated
components. This
article also covers
lighting equipment
connected to a Class
2 power source.
9. Lighting Systems Operating at 30 Volts
or Less and Lighting Equipment
Connected to Class 2 Power Sources
411.3 Low-Voltage Lighting Systems
(A) General. Lighting systems operating at 30 volts or
less shall consist of an isolating power supply, low-voltage
luminaires, and associated equipment that are all identified
for the use. The output circuits of the power supply shall
be rated for 25 amperes and 30 volts (42.4 volts peak)
maximum under all load conditions.
(B) Class 2. Listed Class 2 lighting equipment shall be
rated in conformance with Chapter 9, Table 11(A) or
Table 11(B).
10. Appliances
422.23 Tire Inflation
and Automotive
Vacuum Machines
Tire inflation machines
and automotive vacuum
machines provided for
public use shall be
protected by a ground-
fault circuit interrupter.
11. Appliances
422.51 Vending Machines
(A) Cord-and Plug-Connected. Cord-and plug-
connected vending machines manufactured or
remanufactured on or after January 1, 2005, shall include a
ground-fault circuit interrupter as an integral part of the
attachment plug or be located within 300 mm (12 in.) of
the attachment plug. Older vending machines
manufactured or remanufactured prior to January 1, 2005,
shall be connected to a GFCI-protected outlet.
12. Appliances
422.51 Vending Machines – (cont.)
(B) Other Than Cord-and Plug-Connected. Vending
machines not utilizing a cord and plug connection shall be
connected to a ground-fault circuit-interrupter protected
circuit.
Informational Note: For further information, see
ANSI/UL 541- 2010, Standard for Refrigerated Vending
Machines, or ANSI/UL 751-2010, Standard for Vending
Machines.
13. Storage Batteries
480.2 Definitions
Cell. The basic
electrochemical unit,
characterized by an
anode and a cathode,
used to receive, store,
and deliver electrical
energy.
14. Storage Batteries
480.2 Definitions – (cont.)
Container. A vessel that holds the plates,
electrolyte, and other elements of a single unit in a
battery.
Informational Note: A container may be single-cell
or multi-cell and is sometimes referred to in the
industry as a “jar.”
15. Storage Batteries
480.2 Definitions – (cont.)
Electrolyte. The medium that provides the ion
transport mechanism between the positive and
negative electrodes of a cell.
16. Storage Batteries
480.2 Definitions – (cont.)
Intercell Connector. An electrically conductive
bar or cable used to connect adjacent cells.
17. Storage Batteries
480.2
Definitions – (cont.)
Intertier Connector. An
electrical conductor used
to connect two cells on
different tiers of the same
rack or different shelves
of the same rack.
18. Storage Batteries
480.2 Definitions – (cont.)
Nominal Voltage (Battery or Cell). The value
assigned to a cell or battery of a given voltage class
for the purpose of convenient designation. The
operating voltage of the cell or battery may vary
above or below this value.
19. Storage Batteries
480.2 Definitions – (cont.)
Terminal. That part of a cell, container, or battery
to which an external connection is made
(commonly identified as post, pillar, pole, or
terminal post).
20. 480.3 Battery and Cell
Terminations
(A) Dissimilar Metals. Where
mating dissimilar metals,
antioxidant material suitable for
the battery connection shall be
used.
Informational Note: The battery
manufacturer’s installation and
instruction manual can be used
for guidance for acceptable
materials.
21. 480.3 Battery and Cell
Terminations – (cont.)
(B) Intercell and Intertier Conductors and
Connections. The ampacity of field-assembled
intercell and intertier connectors and conductors
shall be of such cross-sectional area that the
temperature rise under maximum load conditions
and at maximum ambient temperature shall not
exceed the safe operating temperature of the
conductor insulation or of the material of the
conductor supports.
22. 480.3 Battery and Cell
Terminations – (cont.)
Informational Note: Conductors sized to
prevent a voltage drop exceeding 3 percent of
maximum anticipated load, and where the
maximum total voltage drop to the furthest
point of connection does not exceed 5 percent,
may not be appropriate for all battery
applications. IEEE 1375-2003, Guide for the
Protection of Stationary Battery Systems, provides
guidance for overcurrent protection and
associated cable sizing.
23. 480.3 Battery and Cell
Terminations – (cont.)
(C) Battery Terminals.
Electrical connections to
the battery, and the
cable(s) between cells on
separate levels or racks,
shall not put mechanical
strain on the battery
terminals. Terminal
plates shall be used
where practicable.
24. 480.9 Battery Locations
(A) Ventilation. Provisions appropriate to the battery
technology shall be made for sufficient diffusion and
ventilation of gases from the battery, if present, to
prevent the accumulation of an explosive mixture.
Informational Note No. 1: See NFPA 1, Fire Code,
Chapter 52, for ventilation considerations for specific
battery chemistries.
Informational Note No. 2: Some battery technologies
do not require ventilation.
25. 480.9 Battery Locations – (cont.)
(B) Live Parts. Guarding of live parts shall comply with 110.27.
(C) Spaces About Battery Systems. Spaces about battery systems
shall comply with 110.26. Working space shall be measured from
the edge of the battery cabinet, racks, or trays. For battery racks,
there shall be a minimum clearance of 25 mm (1 in.) between a cell
container and any wall or structure on the side not requiring access
for maintenance. Battery stands shall be permitted to contact
adjacent walls or structures, provided that the battery shelf has a
free air space for not less than 90 percent of its length.
Informational Note: Additional space is often needed to
accommodate battery hoisting equipment, tray removal, or spill
containment.
26. 480.9 Battery Locations – (cont.)
(D) Top Terminal Batteries. Where top terminal
batteries are installed on tiered racks, working space in
accordance with the battery manufacturer’s instructions
shall be provided between the highest point on a cell and
the row or ceiling above that point.
Informational Note: Battery manufacturer’s installation
instructions typically define how much top working
space is necessary for a particular battery model.
27. 480.9 Battery Locations – (cont.)
(E) Egress. A personnel door(s) intended for entrance
to, and egress from, rooms designated as battery rooms
shall open in the direction of egress and shall be equipped
with listed panic hardware.
(F) Piping in Battery Rooms. Gas piping shall not be
permitted in dedicated battery rooms.
28. 480.9 Battery Locations – (cont.)
(G) Illumination. Illumination shall be provided for
working spaces containing battery systems. The lighting
outlets shall not be controlled by automatic means only.
Additional lighting outlets shall not be required where the
work space is illuminated by an adjacent light source. The
location of luminaires shall not:
(1) Expose personnel to energized battery components
while performing maintenance on the luminaires in the
battery space; or
(2) Create a hazard to the battery upon failure of the
luminaire.
