Jockey pump tap

[Tainted]

Need to find power for a jockey pump.

Can you tap power ahead of the fire pump controller and install a tap splice box for the jockey pump? See oneline diagram.

The main disconnect for the fire pump and jockey pump will be sized for the total LRC.
The disconnect for the jockey pump will be sized per the jockey pump LRC.

 

[texie]

Just connect the jockey pump to an available panel. It does not need to be treated the same as the fire pump. Just wire per normal 430 rules.

 

[Tainted]

Just connect the jockey pump to an available panel. It does not need to be treated the same as the fire pump. Just wire per normal 430 rules.

I know you can do it like that with jockey pump but I want tap ahead of FP controller because it's a better design in my opinion. also if I hook it up to a regular panel, the OCPD needs to be rated for LRC

 

[d0nut]

I know you can do it like that with jockey pump but I want tap ahead of FP controller because it's a better design in my opinion. also if I hook it up to a regular panel, the OCPD needs to be rated for LRC

The jockey pump OCPD does not need to be sized for locked rotor. The jockey pump follows the normal motor requirements. None of the special requirements in Article 695 apply to jockey pumps.

I would argue it is a better design to keep the jockey pump separate from the fire pump. Everything you add to the system is another potential point of failure.

 

[Tainted]

The jockey pump OCPD does not need to be sized for locked rotor. The jockey pump follows the normal motor requirements. None of the special requirements in Article 695 apply to jockey pumps.

I would argue it is a better design to keep the jockey pump separate from the fire pump. Everything you add to the system is another potential point of failure.

I have to respectfully disagree with you that OCPD for jockey pump does not have to be sized using LRC. I think you may not have to use LRC if you do not use the fire pump feeders to power jockey pump.

I don't see any issue if I just add another circuit to the fire pump feeder. Someone can tamper with the jockey pump and I'd rather put it in a circuit that is lockable. You're likely to have issues with the jockey pump if it is not in it's own circuit with the fire pump.

 

[d0nut]

I have to respectfully disagree with you that OCPD for jockey pump does not have to be sized using LRC. I think you may not have to use LRC if you do not use the fire pump feeders to power jockey pump.

I don't see any issue if I just add another circuit to the fire pump feeder. Someone can tamper with the jockey pump and I'd rather put it in a circuit that is lockable. You're likely to have issues with the jockey pump if it is not in it's own circuit with the fire pump.

There is nothing special about a jockey pump. It is just like any other motor in your facility.

You can lock any circuit. Nothing in the NEC prohibits locking circuits in the on position. Circuit breaker tripping (and fuse melting for that matter) do not rely on handle motion.

What issues do you believe you will have with a jockey pump that feeding it from the fire pump circuit would resolve?

 

[texie]

I know you can do it like that with jockey pump but I want tap ahead of FP controller because it's a better design in my opinion. also if I hook it up to a regular panel, the OCPD needs to be rated for LRC

Simply not correct. Where are you getting this idea?

 

[Tainted]

Simply not correct. Where are you getting this idea?

Sorry I was wrong, jockey pump OCPD shouldn’t be sized at LRC if power is coming from a different source

 

[Tainted]

There is nothing special about a jockey pump. It is just like any other motor in your facility.

You can lock any circuit. Nothing in the NEC prohibits locking circuits in the on position. Circuit breaker tripping (and fuse melting for that matter) do not rely on handle motion.

What issues do you believe you will have with a jockey pump that feeding it from the fire pump circuit would resolve?

Ehh, forget it, I’ll just make it simple and power jockey pump via a separate source using article 430. If jockey pump is 1HP 208V 3 phase, will a 15A breaker be adequate? It’ll be inverse time

 

[d0nut]

Yes, a 15A circuit breaker is adequate.

The FLA for a 208V, 3 phase motor is 4.6A per Table 430.250. The maximum rating permitted for an inverse time breaker is 250% of FLA per Table 430.52. 4.6A*250%=11.5A. Since 11.5A is not a standard size per 240.6, you are permitted to use the next standard size up which is 15A.