Page 715 - 2018_IRC

GENERAL REQUIREMENTS

E3404.12 Field-applied hazard markings. Where caution, 2, The width of the working space shall be the
warning, or danger signs or labels are required by this code, width of the equipment enclosure or not less
the labels shall meet the following requirements: than 30 inches (762 mm), whichever is greater.
1. The marking shall warn of the hazard using effective 3. Enclosure doors and hinged panels shall be
words, colors, symbols or any combination thereof. capable of opening not less than 90 degrees.
2. Labels shall be permanently affixed to the equipment or 4. The space in front of the enclosure shall comply
wiring method. with the depth requirements of Table
110.26(A)(1) of NFPA 70. The maximum
3. Labels shall not be hand written except for portions of
labels or markings that are variable, or that could be height of the working space shall be the height
subject to changes. Labels shall be legible. necessary to install the equipment in the limited
space. A horizontal ceiling structural member or
4. Labels shall be of sufficient durability to withstand the access panel shall be permitted in this space.
environment involved. [110.21(B)] [110.26(A) (1), (2), (3), (4)]
E3404.13 Identification of disconnecting means. Each dis- Exceptions:
connecting means shall be legibly marked to indicate its pur-
pose, except where located and arranged so that the purpose 1. In existing dwelling units, service equipment and
is evident. The marking shall have the durability to withstand panelboards that are not rated in excess of 200
the environment involved. [110.22(A)] amperes shall be permitted in spaces where the height
of the working space is less than 6.5 feet (1981 mm).
[110.26(A)(3) Exception No. 1]
SECTION E3405 2. Meters that are installed in meter sockets shall be per-
EQUIPMENT LOCATION AND CLEARANCES mitted to extend beyond the other equipment. Meter
E3405.1 Working space and clearances. Access and work- sockets shall not be exempt from the requirements of
ing space shall be provided and maintained around all electri- this section. [110.26(A)(3) Exception No. 2]
cal equipment to permit ready and safe operation and E3405.3 Indoor dedicated panelboard space. The indoor
maintenance of such equipment in accordance with this sec- space equal to the width and depth of the panelboard and
tion and Figure E3405.1. (110.26) extending from the floor to a height of 6 feet (1829 mm) above
the panelboard, or to the structural ceiling, whichever is lower,
E3405.2 Working clearances for energized equipment and
panelboards. Except as otherwise specified in Chapters 34 shall be dedicated to the electrical installation. Piping, ducts,
through 43, the dimension of the working space in the direction leak protection apparatus and other equipment foreign to the
of access to panelboards and live parts of other equipment electrical installation shall not be installed in such dedicated
likely to require examination, adjustment, servicing or mainte- space. The area above the dedicated space shall be permitted to
nance while energized shall be not less than 36 inches (914 contain foreign systems, provided that protection is installed to
mm) in depth. Distances shall be measured from the energized avoid damage to the electrical equipment from condensation,
parts where such parts are exposed or from the enclosure front leaks and breaks in such foreign systems (see Figure E3405.1).
or opening where such parts are enclosed. In addition to the 36- Exception: Suspended ceilings with removable panels shall
inch dimension (914 mm), the work space shall not be less than be permitted within the 6-foot (1829 mm) dedicated space.
30 inches (762 mm) wide in front of the electrical equipment E3405.4 Outdoor dedicated panelboard space. The out-
and not less than the width of such equipment. The work space door space equal to the width and depth of the panelboard,
shall be clear and shall extend from the floor or platform to a and extending from grade to a height of 6 feet (1829 mm)
height of 6.5 feet (1981 mm) or the height of the equipment, above the panelboard, shall be dedicated to the electrical
whichever is greater. In all cases, the work space shall allow at installation. Piping and other equipment foreign to the electri-
least a 90-degree (1.57 rad) opening of equipment doors or cal installation shall not be located in this zone.
hinged panels. Equipment associated with the electrical instal-
lation located above or below the electrical equipment shall be E3405.5 Location of working spaces and equipment.
permitted to extend not more than 6 inches (152 mm) beyond Required working space shall not be designated for storage.
the front of the electrical equipment. Panelboards and overcurrent protection devices shall not be
located in clothes closets, in bathrooms, or over the steps of a
Where such equipment is required by installation instruc- stairway. [110.26(B), 240.24(D), (E), (F)]
tion or function is located in a space with limited access, all
of the following shall apply: E3405.6 Access and entrance to working space. Access shall
be provided to the required working space. [110.26(C)(1)]
1. Where the equipment is installed above a lay-in ceiling,
there shall be an opening not smaller than 22 inches by E3405.7 Illumination. Artificial illumination shall be pro-
22 inches (559 mm by 559 mm), or in a crawl space, vided for all working spaces for service equipment and panel-
there shall be an accessible opening not smaller than 22 boards installed indoors and shall not be controlled by
inches by 30 inches (559 mm by 762 mm). automatic means only. Additional lighting outlets shall not be
required where the work space is illuminated by an adjacent
light source or as permitted by Exception 1 of Section
E3903.2 for switched receptacles. [110.26(D)]

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