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3-phase/single phase question

ishiboo

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Oct 27, 2010
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Oshkosh, WI
Here's a question for the EE guys here.

I accidentally purchased two 42-outlet PDUs, which I saw "120v" and didn't realize they were 3-phase inputs. The PDU has 3 distinct outlet groups, one for each phase, with current measured on each.

What I was thinking is using single phase, and putting the neutral to the neutral/ground to the ground obviously, and then the first hot to L1 and L3 and the second hot to L2. That would leave 20A on the 1st and 3rd outlet groups, and 20A on the second.

I'm curious with the way things are wired/measured, if it will work correctly and measure current correctly this way?

I know I bought the wrong things, but they are super cool, super cheap and will look awesome on the workbench :beer:
 
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Mustang51js

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Haskell nj
It would work that way, only issue I see is the chance to overload the one phase since it will be double the amount of possible spaces compared to the other phase
 

wyliesdiesels

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Modesto, CA
U would be violating the U/L listing.

Make sure to feed with 240v/opposite phases otherwise u WILL overload the neutral!
 
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ishiboo

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Joined
Oct 27, 2010
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9,481
Location
Oshkosh, WI
U would be violating the U/L listing.

Make sure to feed with 240v/opposite phases otherwise u WILL overload the neutral!

Yeah, I don't care about that.

I tried it by putting 120v on all 3 legs and it works great, it's pretty cool as it has a LED digital amp meter readout for each leg, it automatically cycles between the 3. Will be a great strip!

I believe the cord is 8 gauge, if that's the case I might feed it with three separate 120v legs (two from one phase, one from another) which would give it 60 amps total. (And a maximum of 40A on the netural)
 
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ishiboo

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Oh, and the outlets alternate, they're not grouped... to make it easier to distribute the load in the rack. Been like 7 years since I've had to go do anything in a data center :)
 
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