EESparky
Member
- Location
- Windber, PA
I have a fire pump, 3-phase, 208 volts, 25 hp, with a control panel with a packaged 150 amp circuit breaker in the panel. There are no other loads (jockey pumps...) beside one small light and on receptacle.
According to 695, the conductors shall be 125% of fire pump FLA loads + 100% of miscellaneous loads. This calculates out to about 96 amps. I would think that I would then need a (minimum) of a 100 amp service with #3 conductors (service is close by fire pump so voltage drop is negligable). BUT....my question is, how does the 150 amp circuit breaker in the Fire Pump Controller affect this? Do I need a "150 amp" service size with 1/0 wires and if so, what is the code reference for this?
According to 695, the conductors shall be 125% of fire pump FLA loads + 100% of miscellaneous loads. This calculates out to about 96 amps. I would think that I would then need a (minimum) of a 100 amp service with #3 conductors (service is close by fire pump so voltage drop is negligable). BUT....my question is, how does the 150 amp circuit breaker in the Fire Pump Controller affect this? Do I need a "150 amp" service size with 1/0 wires and if so, what is the code reference for this?