Circuit specs for 1.5 HP fire pump

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  #1  
Old 03-03-06, 10:19 AM
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Circuit specs for 1.5 HP fire pump

A fire sprinkler contractor will supply a 1.5 HP fire pump. He said it draws 13 amps at 220 V and 80 amps locked rotor.

Table 430-148 says 10A FLC at 230v and 430-151 says 60 A locked rotor.

I will need to have an electrical contractor provide power so I need specs for him. Or her.

Distance is <50' to 240V single-phase load center.
This is in a basement.
What size breaker do I need to provide?
What size conductors?
What's the advantage of having a motor contactor/controller?
Do I need some type of GFCI?
 
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  #2  
Old 03-03-06, 01:05 PM
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Follow the nameplate information from the contractor.
You need an 80A breaker [695.4(B)(1)] and a minimum of #12 wire [695(C)(2)]. Are you required to follow all the rules of 695?
 
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Old 03-03-06, 01:17 PM
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Let's try this first:

It's a fire pump.

How much risk do you want to take that power won't be supplied to it?
Like say that there happened to be a fire... Under what circumstances do you want the breaker to trip?

Are you mounting this thing where it could be a serious problem if it burns up?

If the pump is called upon to run, you want it to run. At least I would.
If it's drawing 40A and dragging on a bad bearing or broken brush or whatever, at least it is running.

As for conductors, use a #8 copper. You don't want to worry about them failing before the pump does.

A contactor allows you to use small wires or even low voltage to energize the heavy-duty circuit.
 

Last edited by bolide; 03-03-06 at 03:29 PM.
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Old 03-03-06, 02:13 PM
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Originally Posted by HandyRon
Follow the nameplate information from the contractor.
You need an 80A breaker [695.4(B)(1)] and a minimum of #12 wire [695(C)(2)]. Are you required to follow all the rules of 695?
Thanks. That's just what I was looking for.

I don't know how exactly 695 is codified in WI or local law but this is a good starting point for me. I'm not about to skimp on this but I wanted to know code minimums & recommendations since I will probably get prices from more than one electrical contractor.


Originally Posted by bolide
How much risk do you want to take that power won't be supplied to it?
Like say that there happened to be a fire... Under want circumstances do you want the breaker to trip?

Are you mounting this thing where it could be a serious problem if it burns up?
Well, right, presumably we want the pump to run even if the building is burning down around it, sparks are flying and it's ready to sail off the mounts. So based on 695-6(d) it looks like it should have only short-circuit protection.

Originally Posted by bolide
A contactor allows you to use small wires or even low voltage to energize the heavy-duty circuit.
OK, presumably the sprinkler guys will supply that with the motor and flow switch, but I will check with them.
 
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