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Switching circuits.

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Switching circuits.

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Switching circuits.

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This standard applies to all types of electrically controlled indoor and outdoor power circuit breakers, including circuit breakers in switchgear cubicles and in metal-clad switchgear, having an interrupting rating of 50 megavolt-amperes (mva) or higher and a voltage rating above 1500 volts. This standard applies for any source of circuit breaker operating energy, such as solenoid, motor, spring, compressed gas, etc, for any type of operating mechanism and for both a-c and d-c control power.

Switching circuits. --- Standards.

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This standard covers ratings, construction, and testing of dead-front control switchboards containing but not limited to devices such as switches, control devices, instrumentation, metering, monitoring, alarms, annunciators, protective and auxiliary relays, and regulating devices and accessories. It includes, but is not specifically limited to, switchboards for the control and protection of apparatus used for or associated with power generation, conversion, transmission, and distribution. Types of switchboards may include control, vertical, dead-front, enclosed, dual, or duplex switchboards. Other construction types include control desks, consoles, benchboards, dual or duplex benchboards, fixed rack, cabinet, and swing rack cabinets. It does not apply to industrial controls, communication equipment, switchboards for use on board ships, or Class 1E switchboards for use in nuclear generating stations.

Electric switchgear. --- Switching circuits.