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NOTE: This is an unformatted excerpt from our online fire protection training library.

Overcurrent Protection for Conductors & Equipment

Protection of Conductors

Short Circuit Only

Subsection 240.4(A) addresses the power loss hazard and is an alternative to the general rule of Section 240.4. For example, loss of power to a fire pump might be a greater hazard than overloaded conductors supplying a fire pump. 

For a fire pump, the Code requires that the circuit overcurrent device must be sized to allow the fire pump to run to failure. The circuit must stay online while a fire pump is drawing locked rotor current, so the only protection that's actually required (or permitted) is short-circuit protection.

Of course, since this short-circuit device responds to high currents, it will likely provide some protection from other high currents such as ground fault current.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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