generator, 480 v, 200 amp

[shalomfred]

I was asked to hard wire a three-phase generator for a city septic system. It is currently hooked up with a so cord. The generator has three phase wires with a chassis ground, in the service the ground is connected ground with a neutral being derived there. Do, I need to try and pull a neutral from the generator? Am I calculating the wire size correct at 250kcmils.

you all are great helping with our issues, thank you

 

[tom baker]

Is the generator neutral bonded to the frame?
Are there any 277 volt loads? Is the transfer switch 3 or 4 pole?

 

[shalomfred]

transfer switch is 3 poll, the motors (pumps) are 277v, I do not know about the generator neutral, there was generator person there calibrating the generator I could not get in there

 

[tom baker]

Then the generator would be wired as a SDS, with bonding and grounding at the building service. The neutral is only bonded are the service. There is a requirement in Art 702 for signage.
How big are the pumps? 277 is a uncommon pump / motor voltage. You asked about pulling a neutral..,it’s needed for your pumps and a a ground fault return to the generator windings

 

[shalomfred]

will ask about the pump voltage, I will ask the generator company about the generator how it is wired, the reason I am asking these people is because this town is an hour away, I will go out if I need to, let me know other things I need to find out

 

[tom baker]

Find out size (amps) of generator circuit breaker
Does the generator have a heater and battery charger (probably) if so you will need to provide a circuit, get amps and voltage of those.
Will the owner want remote alarms and monitoring?
Get a picture of generator nameplate
If there is a control panel, get s as wiring diagram
Others will comment.,,

 

[shalomfred]

I will get this info for you. I will have to go there and i will do that on Thursday.

 

[OldBroadcastTech]

If it is LP fired, make sure there are provisions for keeping the regulator warm (wrap in heat tape then duct tape) and be sure the heat tape is fed from the correct source ( if there is also utility power).

 

[qcroanoke]

If it is LP fired, make sure there are provisions for keeping the regulator warm (wrap in heat tape then duct tape)

I have never heard of keeping a regulator warm.
Am I missing something?