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Old 01-15-2014, 09:58 PM   #21
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Originally Posted by kzimmer0817 View Post
Thank you, PJ, I understood "how" to do it. My question was more of: is there a point at which you "need" to divide up the 120V components between the two 120V sides? This is, apparently, not an issue in the vast majority of the builds for which you have provided schematics - or your expertise/knowledge would have drawn it that way.

I imagine that this would be important once the total current draw of whatever pumps, contactors, PIDs, indicator lights, etc could conceivably be on a the same time exceeds the 15A 120V breaker, you would need to divide them up between the two legs of the original 240V circuit with each being protected by an appropriate breaker.

In theory you could get a little more power if you split it up. Your main breaker will trip if either leg exceeds the power rating. So if you had a 50 amp circuit and needed 35 for your elements you you could get up to 30 amps of 120, 15 from each pole. But the reality is most systems don't need that much 120 power.

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Old 01-15-2014, 11:26 PM   #22
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It would not be too difficult to tally up all of the amperage draws for the 120v components, use the start-up amperage for pumps and any other motor, and see explicitly what you have. If that total, plus the element amperage draw, does not exceed your circuit rating, then there is no need to split the 120v components between the hot legs. If it does, then you only need to move enough off of one circuit so that each circuit does not exceed your rating. Of course, you could balance it evenly if you wanted, but functionally it would not make a difference.

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