Note: this is the opposite of backfeeding, for which there are many questions and answers. Have not seen anything on the internet about this scenario.

Say you had a 240V generator inlet with a 50A breaker professionally installed, and you needed to run a 240V appliance close to where that inlet is, but where there is no 240V outlet available. The hypothetical appliance is three-wire; the outlet is 4-wire/4-prong. Aside from the interlock/lockout kit on the breaker panel, is there anything dangerous or wrong with wiring the appliance with the matching generator plug and powering the appliance through the inlet?

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    Not possible. It is interlocked so it can't receive power from the grid. Do you wish to permanently abandon the generator capability? Jun 15 at 1:17
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    Can't plug a plug into a plug. Powering an inlet is hazardous and illegal (exposed energized prongs.) The interlock you obviously plan to defeat. The problems here are myriad.
    – Ecnerwal
    Jun 15 at 1:26
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    Totally agree with @Ecnerwal and harp . This is a very very dangerous idea. If installed, it would require bypassing the generator interlock, which puts lineman at risk, not only that, you have open prongs powered up, if anybody touched them, big shock. VERY VERY BAAAAAAAD IDEA ALL THE WAY AROUND. DON'T DO IT. Jun 15 at 4:24

1 Answer 1


A reverse suicide cord only works if prongs are energized

And that is just as bad as a suicide cord.

You are talking about putting 240V on the prongs of a generator inlet. What happens when a child opens up the door and touches it? Or what if your socket has a metal sleeve around it (as many do) and you put it in a little wonky and short prongs together with it?

Prongs should not be energized. End of discussion.

You would need to remove the interlock in any case. So take one more step.

The interlock is there to assure the generator inlet cannot be energized at the same time as the utility service. So you will need to remove the interlock to energize that inlet.

Since you are doing that much work, do a little more work and swap the inlet for a proper outlet.

"I want to switch it back and forth between generator inlet and EV outlet".

Fine, when you switch, change both the interlock and the inlet/outlet.

  • True, and I suppose this answers the implicit question I did not ask - is it just a matter of outlet / inlet direction rather than something I'm not thinking of? Swapping out the inlet itself makes sense here rather than having to run an additional circuit (given the also-unstated temporary nature of the hypothetical scenario :) )
    – kalzen
    Jun 15 at 1:55
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    Yeah, change the socket and remove the interlock and that should be it. It's a permanent change, but it could be followed by another permanent change next week :) Jun 15 at 4:25

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