Fire Pump Controller

[Capital]

We have a Fire Pump Controller in the pump room.
Controller has a build in disconnect.
Data sheet says it has internal protection at 600% of Lock Rotor.
Electrical meter is in a separate Electrical Room hot tapped from the switchgear.
Do I need a disconnect at the meter?
Does it need to be fused 6X?

 

[JGinIndy]

We have a Fire Pump Controller in the pump room.
Controller has a build in disconnect.
Data sheet says it has internal protection at 600% of Lock Rotor.
Electrical meter is in a separate Electrical Room hot tapped from the switchgear.
Do I need a disconnect at the meter?
Does it need to be fused 6X?

Depends how wiring is ran per 695.6 in concrete,....?

 

[Strathead]

Send us a copy of your riser.

 

[gadfly56]

We have a Fire Pump Controller in the pump room.
Controller has a build in disconnect.
Data sheet says it has internal protection at 600% of Lock Rotor.
Electrical meter is in a separate Electrical Room hot tapped from the switchgear.
Do I need a disconnect at the meter?
Does it need to be fused 6X?

If pulling the meter would shut down the fire pump, you must tap ahead of the meter. If you have a disconnect, it doesn't have to be fused but it does have to be rated for the locked rotor current (LRC), which may or may not be 600% of FLA. You need to go to NFPA 20 for the information on locked rotor current. If you put fuses in the disconnect, they must be rated for the locked rotor current. Be mindful that if this feed serves the jockey pump as well, the disconnect will also need to carry the LRC for the jockey pump.

 

[JGinIndy]

Yep good info and if tap ahead of main as it sounds like is why I asked about wire method per 695.6(A)(1) / 230.6 as Service conductors to controller. If fused back in gear room then 695.6(A)(2) to controller.

 

[don_resqcapt19]

If pulling the meter would shut down the fire pump, you must tap ahead of the meter.

So the utility has to provide free power for a fire pump? What rule in NFPA 20 or 70 requires that?

If you have a disconnect, it doesn't have to be fused but it does have to be rated for the locked rotor current (LRC), which may or may not be 600% of FLA. You need to go to NFPA 20 for the information on locked rotor current.

You can't use the locked rotor code letter on the nameplate and Table 430.7(B) in the NEC to find the locked rotor current?
Also be careful with a non-fused disconnect, if there is a high available fault current. As far as I know, there is no non-fusible disconnect with a SCCR that exceeds 10kA.

If you put fuses in the disconnect, they must be rated for the locked rotor current. Be mindful that if this feed serves the jockey pump as well, the disconnect will also need to carry the LRC for the jockey pump.

It appears to me that both 695.3(A) in the NEC and 9.2.3.4 in NFPA 20, only require the FLA current, not the locked rotor current, of the jockey pump.