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Hey Fellas,

I've got a question I was hoping someone could help me with. Is it possible to adapt a NEMA L6-30P to an L21-30P 3 phase plug?

So there's an L21-30 receptacle and I have a PDU with an L6-30 plug on it, so I'm thinking a 1 foot adapter that goes L21-30P to L6-30R. I've done some research online, but can't find out if and how it is done. I'm pretty sure it is possible, though the L21-30 is rated for 125/250V and the L6-30 is just 250V. I saw on APC's website that they sell an L21-20P to 3 L6-20R's, which makes me assume my configuration can be done.
Anyone know for sure, and how it would have to be wired?

(don't worry, I'm not going to be the one doing the termination :p)
 

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I own stock in FotoMat!
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Hey Fellas,

I've got a question I was hoping someone could help me with. Is it possible to adapt a NEMA L6-30P to an L21-30P 3 phase plug?.........)

Unless there's additional wiring that's not being used in the box, I don't see how.

An L6-30 has two hots and a ground. L21-30 has 3 hots, a neutral and a ground.
 

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Since this is a DIY question.

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Electric Al
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Hey Fellas,

I've got a question I was hoping someone could help me with. Is it possible to adapt a NEMA L6-30P to an L21-30P 3 phase plug?

So there's an L21-30 receptacle and I have a PDU with an L6-30 plug on it, so I'm thinking a 1 foot adapter that goes L21-30P to L6-30R. I've done some research online, but can't find out if and how it is done. I'm pretty sure it is possible, though the L21-30 is rated for 125/250V and the L6-30 is just 250V. I saw on APC's website that they sell an L21-20P to 3 L6-20R's, which makes me assume my configuration can be done.
Anyone know for sure, and how it would have to be wired?

(don't worry, I'm not going to be the one doing the termination :p)

If you hire an electrician,(which you should) he/she will know if it can be done. But obviously if you have only single phase power, you can not have three phase power, without a phase converter.
 

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Discussion Starter #5
Thanks for the feedback. I just wanted to feel it out to see if it could/should be done or not, and it sounds like a bad idea. My tech, who is sort of an abstract mind when it comes to these things, figured we could just wire the 250V wires since the L21-30 is rated for both 125/250V. In any case, looks like we're going to have to go another route. Still not sure how APC sells the L21-20P to L6-20R x 3 adapter seen here http://www.apc.com/resource/include/techspec_index.cfm?base_sku=AP9884

Or is L21-20P not 3 phase?
 

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That device there is converting three phase into 3 single phase tails from the looks of it. For example our APC Rack Power strips are three phase and have 48 outlets so each phase has 16 outlets. In the case of that adapter it's converting three phase into A,B,C
 

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Electric Al
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Thanks for the feedback. I just wanted to feel it out to see if it could/should be done or not, and it sounds like a bad idea. My tech, who is sort of an abstract mind when it comes to these things, figured we could just wire the 250V wires since the L21-30 is rated for both 125/250V. In any case, looks like we're going to have to go another route. Still not sure how APC sells the L21-20P to L6-20R x 3 adapter seen here http://www.apc.com/resource/include/techspec_index.cfm?base_sku=AP9884

Or is L21-20P not 3 phase?
I understood you required 3 phase power.
 

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Bilge Rat
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What you'd like to do is certainly possible. Get an L21-30 plug (male end), an L6-30 connector (female end), and a piece of 10/3 cord. Don't use type NM cable, (also known as Romex), use type S, SO, or other flexible cord.

The L21-30 plug will have terminals marked X, Y, Z, N (or white), and GR.

The L6-30 connector will have X, Y, and GR.

Just match them up.

Green is always ground, and just for simplicity, use black for X, and white for Y.

Z and N are not connected.

You now have 208 volts, 30 amps, single phase.

Rob
 

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