Wiring method for battery chargers 180ft from panel,

[domnic]

chargers

chargers

With 8 chargers the neutral would be 13 amps.

 

[FionaZuppa]

If all three phases are equal, neutral load is ~ 0A.

Maximum imbalance, two phases are 0A and one phase is 39A, neutral is 39A.

yep, i had my math wrong, was coming up with ~66A neutral.
it was just me that goofed it on my calculator.

 

[jumper]

With 8 chargers the neutral would be 13 amps.

:?

 

[LarryFine]

:?

Nine chargers at 39a per phase equals three chargers at 13a per phase. When you start with a balanced circuit with zero neutral current, then deduct 13a from one phase, the neutral current rises by that same 13a. That's why 20a on two phases causes 20a on the neutral.

 

[FionaZuppa]

:?

??

there's only 8 (3/3/2), which is not even across 3ph.

 

[Craigv]

yep, i had my math wrong, was coming up with ~66A neutral.
it was just me that goofed it on my calculator.

:thumbsup: Thanks for clarifying.

 

[jumper]

Nine chargers at 39a per phase equals three chargers at 13a per phase. When you start with a balanced circuit with zero neutral current, then deduct 13a from one phase, the neutral current rises by that same 13a. That's why 20a on two phases causes 20a on the neutral.

??

there's only 8 (3/3/2), which is not even across 3ph.

Yeah, I know this.

It really was the point I was trying to make. Neutral current may 0A or up to 39A depending on which loads are on. It will vary.

 

[LarryFine]

Right. When it's possible to load one phase, the neutral should be full sized.