Romex for 150A Temp Panel

[mstrlucky74]

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.

lol....we might have a few welders running at the same time...maybe 2....I think the welding are 3P. The GC asked for 4 receptacles, doesn't say amperage or whether single or three phase.

 

[mstrlucky74]

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.

How did you arrive at 80,000KVA?

 

[JFletcher]

How did you arrive at 80,000KVA?

My mistake; 81KVA, or 81,000VA.

V_L-L x A x √3
--------------- = 208V x 225A x 1.732 = 81,057.6VA or 81KVA
1000

"The temp panel will only be feeding 2 pole welding hook ups"

That's single phase 120 or 208V equipment.

".I think the welding are 3P. The GC asked for 4 receptacles, doesn't say amperage or whether single or three phase.

Important to know if they are single or three phase, doncha think? Short of welding together aircraft carrier boat anchors or bank vaults, they are probably single phase with 50A cords receptacles.

 

[mstrlucky74]

My mistake; 81KVA, or 81,000VA.

V_L-L x A x √3
--------------- = 208V x 225A x 1.732 = 81,057.6VA or 81KVA
1000

"The temp panel will only be feeding 2 pole welding hook ups"

That's single phase 120 or 208V equipment.

".I think the welding are 3P. The GC asked for 4 receptacles, doesn't say amperage or whether single or three phase.

Important to know if they are single or three phase, doncha think? Short of welding together aircraft carrier boat anchors or bank vaults, they are probably single phase with 50A cords receptacles.

Thanks fletch.