Page 713 - 2018_IRC

GENERAL REQUIREMENTS

vided for in the referenced standard NFPA 70 shall not be SECTION E3404
construed as prohibiting the use of such material or method of GENERAL EQUIPMENT REQUIREMENTS
construction. Electrical systems, equipment or components E3404.1 Voltages. Throughout Chapters 34 through 43, the
not specifically covered in these chapters shall comply with voltage considered shall be that at which the circuit operates.
the applicable provisions of NFPA 70. The voltage rating of electrical equipment shall be not less
E3401.3 Not covered. Chapters 34 through 43 do not cover than the nominal voltage of the circuit to which it is con-
the following: nected. (110.4)
1. Installations, including associated lighting, under the E3404.2 Interrupting rating. Equipment intended to inter-
exclusive control of communications utilities and elec- rupt current at fault levels shall have a minimum interrupting
tric utilities. rating of 10,000 amperes at the nominal circuit voltage.
Equipment intended to interrupt current at levels other than
2. Services over 400 amperes. fault levels shall have an interrupting rating at nominal circuit
E3401.4 Additions and alterations. Any addition or alter- voltage of not less than the current that must be interrupted.
ation to an existing electrical system shall be made in confor- (110.9)
mity to the provisions of Chapters 34 through 43. Where
additions subject portions of existing systems to loads E3404.3 Circuit characteristics. The overcurrent protective
exceeding those permitted herein, such portions shall be devices, total impedance, equipment short-circuit current rat-
made to comply with Chapters 34 through 43. ings and other characteristics of the circuit to be protected shall
be so selected and coordinated as to permit the circuit protec-
tive devices that are used to clear a fault to do so without exten-
SECTION E3402 sive damage to the electrical equipment of the circuit. This
BUILDING STRUCTURE PROTECTION fault shall be assumed to be either between two or more of the
E3402.1 Drilling and notching. Wood-framed structural circuit conductors or between any circuit conductor and the
equipment grounding conductors permitted in Section
members shall not be drilled, notched or altered in any man- E3908.8. Listed equipment applied in accordance with its list-
ner except as provided for in this code.
ing shall be considered to meet the requirements of this section.
E3402.2 Penetrations of fire-resistance-rated assemblies. (110.10)
Electrical installations in hollow spaces, vertical shafts and E3404.4 Enclosure types. Enclosures, other than surround-
ventilation or air-handling ducts shall be made so that the ing fences or walls, of panelboards, meter sockets, enclosed
possible spread of fire or products of combustion will not be switches, transfer switches, circuit breakers, pullout switches
substantially increased. Electrical penetrations into or and motor controllers, rated not over 600 volts nominal and
through fire-resistance-rated walls, partitions, floors or ceil- intended for such locations, shall be marked with an enclo-
ings shall be protected by approved methods to maintain the sure-type number as shown in Table E3404.4.
fire-resistance rating of the element penetrated. Penetrations
of fire-resistance-rated walls shall be limited as specified in Table E3404.4 shall be used for selecting these enclosures
Section R302.4. (300.21) for use in specific locations other than hazardous (classified)
locations. The enclosures are not intended to protect against
E3402.3 Penetrations of firestops and draftstops. Penetra- conditions such as condensation, icing, corrosion, or contam-
tions through fire blocking and draftstopping shall be pro- ination that might occur within the enclosure or enter through
tected in an approved manner to maintain the integrity of the the conduit or unsealed openings. (110.28)
element penetrated.
E3404.5 Protection of equipment. Equipment not identified
for outdoor use and equipment identified only for indoor use,
SECTION E3403 such as “dry locations,” “indoor use only” “damp locations,”
INSPECTION AND APPROVAL or enclosure Type 1, 2, 5, 12, 12K and 13, shall be protected
E3403.1 Approval. Electrical materials, components and against damage from the weather during construction.
equipment shall be approved. (110.2) (110.11)
E3403.2 Inspection required. New electrical work and parts E3404.6 Unused openings. Unused openings, other than
of existing systems affected by new work or alterations shall those intended for the operation of equipment, those intended
be inspected by the building official to ensure compliance for mounting purposes, and those permitted as part of the
with the requirements of Chapters 34 through 43. design for listed equipment, shall be closed to afford protec-
tion substantially equivalent to the wall of the equipment.
E3403.3 Listing and labeling. Electrical materials, compo- Where metallic plugs or plates are used with nonmetallic
nents, devices, fixtures and equipment shall be listed for the enclosures they shall be recessed at least / inch (6.4 mm)
1
4
application, shall bear the label of an approved agency and from the outer surface of the enclosure. [110.12(A)]
shall be installed, and used, or both, in accordance with any
instructions included in the listing and labeling. [110.3(B)] E3404.7 Integrity of electrical equipment. Internal parts of
electrical equipment, including busbars, wiring terminals,
insulators and other surfaces, shall not be damaged or con-
taminated by foreign materials such as paint, plaster, cleaners
or abrasives, and corrosive residues. There shall not be any

688 2018 INTERNATIONAL RESIDENTIAL CODE ®
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