Electric Transmission and Distribution Equipment Manufacturing

Establishments primarily engaged in manufacturing power, distribution, instrument, and specialty transformers. Sample business functions include airport lighting transformers, auto-transformers for switchboards (except telephone switchboards), electric auto-transformers, ballasts for lighting fixtures, control transformers, current limiting reactors, electric distribution transformers, electric doorbell transformers, electric furnace transformers, and feeder voltage regulators and boosters.

Establishments primarily engaged in manufacturing switchgear and switchboard apparatus. Important products of this industry include power switches, circuit breakers, power switching equipment, and similar switchgear for general industrial applications, as well as switchboards, cubicles, control and metering panels, fuses, fuse mountings, and related switchboard apparatus and supplies. Sample business functions include air circuit breakers, bus bar structures, power circuit breakers, electric power distribution control panels, electric switchboard cubicles, electric distribution boards, distribution cutouts, electric fuse clips and blocks, power fuse devices rated at 600 volts and over, and electric power fuse mountings.