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Old 11-11-2012, 10:04 AM   #16
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Transfer switch for generator


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Originally Posted by brric View Post
You will need two transfer devices unles the transfer is installed ahead of the two meters. If you apply power to the WH from transfer panel without interruption you will backfeed the WH meter and subsequently the main panel meter.
I think you need to look at a schematic of the switch panel. There is no way it could happen as you describe.

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Old 11-11-2012, 05:35 PM   #17
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Transfer switch for generator


This type of transfer switch box has a separate set of wires for each branch circuit that will receive generator power. A 240 volt branch circuit such as for the water heater must use the center pair of transfer switches whose handles are tied together.

When the water heater circuit is on generator power, it is tied to the same generator power feed as other circuits in the same transfer switch box. But it is not (it must not be) connected to any utility power feed let alone the separate power feed metered at a different rate. Its breaker in the main panel is not in use. The individual transfer switches in the box are also breakers so each branch circuit is limited to the amperes it should handle, as opposed to the generator's full output.

When the water heater is on utility power, it is no longer tied to any other circuits it shared generator power with. The individual transfer switch is now acting like a switch in a switch loop.
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Last edited by AllanJ; 11-11-2012 at 06:19 PM.
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Old 11-12-2012, 07:39 PM   #18
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Transfer switch for generator


Allan, you speak electrical better than I speak English. Hahaha. I see you are also in Nashua, Nh. You are my neighbor. Are you an electrician by trade?

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