Romex for 150A Temp Panel

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mstrlucky74

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I have to feed a 150A temp panel. The temp panel will only be feeding 2 pole welding hook ups and temp light stringers so I'm not sure not sure I would need a neutral. I'm asking because I think I need 2/4 Romex to feed this panel and not 2/3. I guess
 
mstrlucky74 said:
I have to feed a 150A temp panel. The temp panel will only be feeding 2 pole welding hook ups and temp light stringers so I'm not sure not sure I would need a neutral. I'm asking because I think I need 2/4 Romex to feed this panel and not 2/3. I guess
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You do not need 5 wires unless it's 3ph with neutral. Romex only goes as big as #4, which is probably fine for a temp panel. You will need a neutral for the lights unless they are 208/240V (unlikely) and any receptacles for 120V.
 
mstrlucky74 said:
I have to feed a 150A temp panel. The temp panel will only be feeding 2 pole welding hook ups and temp light stringers so I'm not sure not sure I would need a neutral. I'm asking because I think I need 2/4 Romex to feed this panel and not 2/3. I guess
Click to expand...

You will need the neutral. For a 208Y/120 volt feeder at 150 amps you could use #2/0 or #3/0 Al MC cable or SE cable.
 
mstrlucky74 said:
I have to feed a 150A temp panel. The temp panel will only be feeding 2 pole welding hook ups and temp light stringers so I'm not sure not sure I would need a neutral. I'm asking because I think I need 2/4 Romex to feed this panel and not 2/3. I guess
Click to expand...


If the lights are 120V..........you know the answer
 
It's small space(700 sq ft.) but I have the following 120/208v need temp power so I figured 225A panel would be about right.

4 welding connection( not sure amperage, figuring 60A each)
Power for (1) 2 ton chain hoist( figuring 20A)
Power for (2) trolley beams( figuring 20A each)
TL&P stringers.


With all this I think I need 225A temp panel.
 
packersparky said:
For the 120v lights.
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Dumb question....:dunce: so why exactly? And if you were dealing with just receptacles would a neutral be required and why or why not? Appreciate it. I know when you wire light fixtures a neutral is required so I assume that's the shirt answer but receptacles require a neutral too? Thanks
 
mstrlucky74 said:
Dumb question....:dunce: so why exactly? And if you were dealing with just receptacles would a neutral be required and why or why not? Appreciate it. I know when you wire light fixtures a neutral is required so I assume that's the shirt answer but receptacles require a neutral too? Thanks
Click to expand...

120V receptacles and lights require a neutral to complete a circuit path.
 
mstrlucky74 said:
It's small space(700 sq ft.) but I have the following 120/208v need temp power so I figured 225A panel would be about right.

4 welding connection( not sure amperage, figuring 60A each)
Power for (1) 2 ton chain hoist( figuring 20A)
Power for (2) trolley beams( figuring 20A each)
TL&P stringers.


With all this I think I need 225A temp panel.
Click to expand...

Now you're getting colder. 225A, 208V, 3ph is ~80,000KVA. In that space, you're not going to have 4 60A 3ph welders running simultaneously at a 100% duty cycle. You'd have 1 running some minutes here and there at ~30% or so. and you already wrote they are 1ph welders. 700ft sq is ~26 x 26, one or two welding receptacles would be fine. The other loads are all very minimal; hoists arent gonna run with 2 ton loads the entire day, lights for 700ft maybe a few kw if incandescent or halogen, and receptacles for tools, 3 20A breakers would cover it.

A 100A 1ph panel would be severe overkill here; 225A 3ph is like launching a nuke at a gnat.
 
mstrlucky74 said:
Dumb question....:dunce: so why exactly? And if you were dealing with just receptacles would a neutral be required and why or why not? Appreciate it. I know when you wire light fixtures a neutral is required so I assume that's the shirt answer but receptacles require a neutral too? Thanks
Click to expand...

As jumper mentioned, 120V, as well as 277V lights and receptacles require a neutral. 208V, 240V, and 480V are all line to line (and dont require a neutral), tho there are some extremely rare/unlikely exceptions to two the last 3 where one might conceivably have 208V to neutral using the high leg of a delta system, or with 240V, having a split phase 240/480V xfmr.

Are your guys going to build you a temporary power box, or are you going to purchase an already made one? Ones that are built are not typically taken apart after a job, but moved to the next site. Right behind capacity and NEC compliance, size and light weight are very important. Don't spec such a beast that it's difficult to move off the truck or to the site.
 
JFletcher said:
As jumper mentioned, 120V, as well as 277V lights and receptacles require a neutral. 208V, 240V, and 480V are all line to line (and dont require a neutral), tho there are some extremely rare/unlikely exceptions to two the last 3 where one might conceivably have 208V to neutral using the high leg of a delta system, or with 240V, having a split phase 240/480V xfmr.

Are your guys going to build you a temporary power box, or are you going to purchase an already made one? Ones that are built are not typically taken apart after a job, but moved to the next site. Right behind capacity and NEC compliance, size and light weight are very important. Don't spec such a beast that it's difficult to move off the truck or to the site.
Click to expand...


I've see those temp power cart setups but no all we need is a temp panel so we will either by or grab from warehouse.
 
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