scope:

This technical publication covers heavy duty enclosed and dead-front switches that are:

a. Rated at not more than 600 volts and 4000 amperes with or without a horsepower rating. The DC ratings shall be up to and including 600 volts, 1200 amperes.

b. With or without provision for fuses

c. With current-carrying parts and mechanisms enclosed in metallic or nonmetallic cases, or that are enclosed when mounted in an enclosed switchboard, panelboard, or the like

d. Manually operable by means of external handles

Note-These devices may also be automatically operable by means of shunt trips, electrical operators, ground fault devices, or other mechanisms.

This technical publication does not cover:

a. The common form of snap switches

b. Switching devices having features intended primarily for the starting and running protection of electric motors as described in NEMA ICS 1, ICS 2, and ICS 3

c. Circuit-breaker-type power circuit protectors

d. Molded case switches as described in NEMA AB 1

e. General duty switches meeting the minimum requirements of UL 98

f. Fused power-circuit devices as described in UL 977

g. Pullout switches as described in UL 1429

Fuses, lampholders, receptacles, wire connectors, wires and cables, etc., which may be provided as parts of an enclosed switch, are covered under other NEMA technical publications.