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DPDT for Boiler/Generator?

JJV

New member
Joined
Dec 2, 2012
Messages
2
I am a new first-time home owner and, while I am handier than most, I am by far no electrical genius.

Our area has a lot of big trees, which results in plenty of electric outages. I want/need to be able to easily hook up my small generator (3500w) to the boiler for heat. The boiler is gas, but of course the water pumps/relays are not, and the whole thing is hardwired to the basement sub-panel. Dealing with the panel is probably beyond my abilities, and installing a transfer switch on the boiler seems like a big job. I investigated a bit and was wondering...

There is a double-receptacle sized box next to the boiler with a single emergency off switch. I opened it up and it's a simple SPST switch for the hot, although the neutral wires run through the box as well. Here is my question... Can I replace this switch with a double-pole double-throw switch and put an outlet next to it (since there's extra room in the box)? Basically... thrown one way the switch would have the boiler hooked up to the hot/neutral on the house line and have the outlet disconnected/dead. Thrown the other way the boiler would be disconnected from the house hot/neutral and instead be hooked to the hot/neutral of the outlet (where I would plug a line from my generator into).

I think this would accomplish the same thing as a transfer switch but be much more simple for somebody like me to put together than installing the transfer switch itself. The design would negate any risk on the outlet when on the house line, and any risk of backfeeding to the panel when on the outlet.

Again, I am an amateur and not sure if I am incredible naive, overlooking something huge, breaking some law or sacred universal doctrine. So please let me know without insulting me (too much anyways). Thanks!
 
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Spire

Well-known member
Joined
Apr 5, 2006
Messages
125
Location
Kenai, Alaska
Make it even simpler, put a cord end on the boiler and plug it in to an outlet. When the power goes out, unplug it from the house and plug it into the generator.

I do like the single circuit transfer switch though.
 
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nehog

Well-known member
Joined
Jan 2, 2010
Messages
7,935
Location
Jaffrey, NH
Make it even simpler, put a cord end on the boiler and plug it in to an outlet. When the power goes out, unplug it from the house and plug it into the generator.

I do like the single circuit transfer switch though.

Best solution... May not meet code, but IMHO that's a minor issue.
 

Charles (in GA)

Well-known member
Joined
Jan 11, 2006
Messages
12,489
Location
50 mi south of Atlanta
Although the cord and plug would work well, if you have any code concerns, you should not do it, as it is not code compliant. Its not unsafe if done properly, its just that a fixed device such as a furnace or boiler is not one of the things listed in the code as allowable to have a flex cord on it, a flex cord is not allowed "As a substitute for the fixed wiring of a structure" according to NEC 400.8

A nearly identical discussion on doing this on a natural gas 120V furnace is FOUND IN THIS THREAD.

Charles
 
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