furnace connection

I am wiring a 240v furnace with 6/3 wire. The furnace has individual breakers as the connection point, one for each phase. My question is- is it ok to jumper the neutral from one breaker to the other. Is it even necessary since the phases us each other to complete the circuit? Any safety issues?

Thanks for any help

  • I gather you yourself did not put the blue dots on the wires, and this is how the furnace is factory wired?? – Harper - Reinstate Monica Feb 20 '18 at 0:36
  • Correct. I have done nothing but removed the panel to expose the wiring pictured. The blue dots are on the furnace side of the breakers. – DJilek Feb 20 '18 at 0:39
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    Does your furnace say that it requires neutral? – Harper - Reinstate Monica Feb 20 '18 at 1:04
  • What make/model is your furnace? – ThreePhaseEel Feb 20 '18 at 1:09
  • It is a Revolv XLO375-B ? Not sure all the specs or if thats the model number. I bought it six months ago and then I knew everything. And of course the book is for 4 different models. – DJilek Feb 20 '18 at 1:18

You furnace looks like it is an approximately 20-KW model. It requires no neutral. It is not asking for a neutral. It requires A phase and B phase from a single phase residential service. And the wiring layout will be as follows: from the top, first breaker, A phase on top and B phase on bottom, and Second breaker A-phase on top and B-phase on bottom. You will need two runs of 6-2 copper or two runs of two 4awg aluminum with ground. In the house panel you will need two each new 60-Amp breakers.

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  • Is 6 alum good to 60, or does OP need 4 if he chooses aluminum? – Tyson Feb 20 '18 at 12:46
  • @Tyson -- yeah, he'll need to go to 4AWG for Al wire – ThreePhaseEel Feb 20 '18 at 12:47
  • That's what I thought to. – Tyson Feb 20 '18 at 12:48

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