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Requ1rements of Control
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a-c motors adjustable air switch air-break alarm ammeter amperes amps anode apparatus is apparatus apparatus so constructed applications arcing arcing horns armature automatic auxiliary battery blade button cell circuit breakers circuit-breaker coil conductors connected contactor contacts control circuit cuit current-limiting designed device diagram dial direct current disconnecting means Double Throw dynamic braking employed enclosed equipment field rheostat fuse grid grounded conductor heat horsepower indicator installation insulating interference knife switches lever light load locations low-voltage machine magnetic manual mechanical mercury metal Metameter milliamperes mounting Normally Closed normally open ohms open or close operation overcurrent overload Phototube relay2 photronic plug Pole Single Break position predetermined protection push-button Pyrometer reset resistance resistor sensitive relay shown in Fig shunt Single Pole Single Throw speed standard starting supply TABLE temperature thermostat thyratron timer tion tungsten type starter Typical vacuum tube valve voltage volts a-c watts wire