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Electric fire pump controllers are not only detailed in NFPA 20, but they are also constructed under strict requirements of NFPA 70, The National Electrical Code (NEC). The cabinets are treated as service units, and the wiring and electrical circuitry is in strict conformance to the requirements of the NEC.
Each fire pump controller has to be matched to the fire pump motor, for both electrical power input and horsepower. The overcurrent device that protects the circuits supplying the controller is not the same as a typical overcurrent device, this is because the motor driving the fire pump is sacrificial, the controller is arranged to try to allow the motor to start until the situation becomes dangerous.
Needless to say, the electrical requirements of the circuits feeding the controller, and the controller itself, are complex, and often misunderstood.
© Hughes Associates,Inc. 2012