I am reviewing a set of drawings that show a fire pump and jockey pump. Basically, there is a #10 tap from the fire pump service to the jockey pump. This seems to be allowed if the tap conduit is encased in 2" of concrete (per 696.6(D)). Am I correct?
Another question about 695.4(1). The overcurrent protection must be sized for the locked rotor currents. Is there any limit to the size of the OCP? If I don't know what the locked rotor currents are, can I just make the OCP so large that I know it can handle the locked rotor currents? And can i do this without upsizing the wire?
More details:
There is a second service from the outdoor utility transformer to the fire pump disconnect (350KCM wire). The service goes to a 1000A fused disconnect. The disconnect feeds a wireway (again with 350KCM wire) where the tap is made. The 350KCM continues to the fire pump, and the #10 goes to the jockey pump.
Another question about 695.4(1). The overcurrent protection must be sized for the locked rotor currents. Is there any limit to the size of the OCP? If I don't know what the locked rotor currents are, can I just make the OCP so large that I know it can handle the locked rotor currents? And can i do this without upsizing the wire?
More details:
There is a second service from the outdoor utility transformer to the fire pump disconnect (350KCM wire). The service goes to a 1000A fused disconnect. The disconnect feeds a wireway (again with 350KCM wire) where the tap is made. The 350KCM continues to the fire pump, and the #10 goes to the jockey pump.
