Wire size

[Therealcrt]

A single phase 120/240v 60amp panel.
The source is 300ft away it’s just a temporary panel serving a contractors trailer. Using aluminum wire wouldn’t it be 2/0 with #4 ground? That’s a voltage drop of 5%

 

[augie47]

My calculator comes up with a #2 AL for 5% if you use the full 60 amp load.
(I image the actual load is far less )

 

[4x4dually]

I like this calculator. It's the one I use.

Voltage Drop Calculator | Southwire

www.southwire.com

 

[infinity]

#2 is fine, maybe even #4. #2/0 is overkill.

 

[Therealcrt]

Aluminum correct? #4 copper for 60amp which is #2 for standard length but with the 300ft shouldn’t it be atleast 1/0??

 

[infinity]

Aluminum correct? #4 copper for 60amp which is #2 for standard length but with the 300ft shouldn’t it be atleast 1/0??

What current value are you using for the calculation? Personally for a temp feeder I would not be very concerned with VD.

 

[Therealcrt]

True. I’m using 60a it’s just a long run if I use #2 aluminum the voltage would be around 108v

 

[Therealcrt]

What size ground? Would I use a #8

 

[wwhitney]

True. I’m using 60a it’s just a long run if I use #2 aluminum the voltage would be around 108v

Just going off the VD calc results other have posted, that's correct for the completely unbalanced case of 0A on L1, 60A on N and L2. But that case isn't very likely.

If you are willing to restrict the design cases to up to 60A on L1 / L2, and an unbalance of at most 30A (N = L1-L2 <= 30A), then your L-N voltage will be at least 114V.

Cheers, Wayne

 

[petersonra]

A single phase 120/240v 60amp panel.
The source is 300ft away it’s just a temporary panel serving a contractors trailer. Using aluminum wire wouldn’t it be 2/0 with #4 ground? That’s a voltage drop of 5%

I am curious how you came to this conclusion.