Sports Field Lighting

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J

jam

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I am involved in a lighting project with 3 sports fields. The customer wants all lighting to be manually controlled from one central location. The highest field lighting load is 55 kva @ 480 v, true single phase (115 amps). The approx wire length from the proposed 480 panel to the field is 1000 ft. I would like to limit voltage drop to 3%.

If the field was supplied by a single 150 amp feeder the wire size calculates to 4/0. Is this reasonable?

Is there a 30A limit for exterior lighting? If so would 5-30 amp cb?s with #1 feeder be preferable.

Should primary service to a transformer be considered ?

HELP !
 
Re: Sports Field Lighting

If the dollars and cents work out, what if you had a seperate service for this field that is 1000' away? You could run a control circuit to it from your central location and have it activate a 150A lighting contactor that goes into a panel, where you can branch out with 20A-50A circuits.

If that's too pricey, time to pull some long runs, don't forget a few Christie boxes! I wouldn't bring the 4/0 into each pole. Go to a subpanel, and take it out of there at an apropriate amperage and wire size for your poles, maybe one or 2 breakers per pole?

What does 480V, true single phase mean???

mike
 
Re: Sports Field Lighting

What does 480V, true single phase mean???
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I assume it means the lights are wired between two phases, and the third phase has no load on it.

Dividing the load between all phases would help some with the voltage drop and wire size.

I think if you put a fuse at each fixture, then the wiring you are talking about is a feeder, and it can be more than 30A.

Steve
 
Re: Sports Field Lighting

Originally posted by jam:If the field was supplied by a single 150 amp feeder the wire size calculates to 4/0. Is this reasonable?
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I agree with this cable size, given your proposed configuration.

I also agree with Mike's suggestion. Be sure to factor in all the costs. It would make the case stronger if you properly account for the difference in material and labor costs for 1000 feet of control cable, versus 1/0 conductors.
 
Re: Sports Field Lighting

Sorry,

By "true single phase" I mean 480V derived from a single 13,200V primary line through a transformer to achieve 480/240 single phase.

Thanks for the continued help.

JC
 
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