3 prong to 4 prong at transfer switch

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Old 03-16-06, 03:58 AM
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3 prong to 4 prong at transfer switch

I have a 5000w gen with a 3 prong 120v 30 amp outlet. My transfer switch, which I am installing, has a 4 prong 30 amp inlet. How do I go from the 3 prong at the generator to the 4 prong at the transfer switch?

The gen also has a 4 prong 120/240 20 amp outlet, which would make installation simpler (4 prong to 4 prong). But the amp is 20, and I figured hooking up the 30 amp would be better.

Appreciate any help.
 
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Old 03-16-06, 04:19 AM
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The three pronged outlet is for 120 volts, and requires only one hot lead, a neutral and a grounding wire. The four pronged outlet is for 240 volts, requiring 2 hot leads, a neutral and a grounding wire. If you are sending this to a transfer switch after which there is a breaker box, you will need to use the 4 pronged lead from the generator to the transfer box in order to heat up both sides of your panel.
 
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Old 03-16-06, 05:28 AM
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Originally Posted by vest
I have a 5000w gen with a 3 prong 120v 30 amp outlet. My transfer switch, which I am installing, has a 4 prong 30 amp inlet. How do I go from the 3 prong at the generator to the 4 prong at the transfer switch?

The gen also has a 4 prong 120/240 20 amp outlet, which would make installation simpler (4 prong to 4 prong). But the amp is 20, and I figured hooking up the 30 amp would be better.

Appreciate any help.
You need to check your math.
30 amps at 120 volts is 3,600 watts.
20 amps at 240 volts is 4,800 watts.

You have two choices. Power some of the circuits on one side of your panel (which would mean absolutely no 240 volt loads), or power some of the circuits in your panel (including a small 240 volt load).
 
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