So it was unclear to me if two phases are available at the panel. Then you could connect 10x 15A circuits to phase L1 and other 10x 15A circuits to phase L2.

You would have power capacity for 14 rigs in 14 circuits.
6 circuits would remain un-used because the panel is maxxed.

Maybe I should drop out from the conversation so that I don't mess this any more. The ANSI standard world is a bit weird to me.

 a nice try on your part.

it all depends on the main breakers.


I hove 2 hots and a ground coming in.

each carry 120 volts and each are attached to a 150amp breaker as I have 150 amp service.

but the breaker is tied together. 

So the question is do you trip at 150+150 = 300 amps

or do you trip at 150 amps

in your case you are saying the 100 amp breaker is not linked

so your service is more like 100+100 = 200 at 120.

BTW. lets say the main breaker works as you say.

110 x 200 x .80 = 17600 /1300 = 13.5 rigs

or 6 on each pole

assuming that the mains will work like you think it works.

ie 100+100 =200 total
vs 100

using 110 is better than 120 since  voltage sag happens in hot months.

Also make very sure you have this balanced and the loads are on each pole the same.

good luck as I think it should be interesting to see if you 100 amp breaker handles 100 + 100 = 200 amps.

Did you see that I said 7 rigs in my next message,
just like DaveF said.

7 rigs is the max. in your setup, with that panel, 120V, and those rigs you described.

The rest 13x circuits will remain empty, because you have already maxxed the 100A panel.
I don't know what your electrician has been thinking (or if he even put any thought in to it) when he created that system with 20x 15A circuit, with 100A panel.

You were also explained the math here, so I don't know how you think you could put 20 rigs there.

I'm not a professional engineer, so check with the proper experts.

This is what I have done as a US mining hobbyist.


1) You cannot overload your electrical panel. So the limit is 100 A. This is what unusual about mining in that you will be needing power 100% 0f the time. A panel may have more circuits then capacity but in your case you are limited to 100A

2) This 100A will flow through circuit breakers. Circuit breakers are derated by code to 80% of their rating.

3) A 120v circuit uses a 15A breaker. The total available power per circuit is 1800W x .8 = 1440 watts

4) So 100A/15A = 6.67 systems

1440 W is on the edge

One thing about mining is that you can to some degree adjust the power draw down. If you are a gpu miner you can shuffle cards around operate them at a lower power for the most hash per 100A.

That will be one miner per 15 Amp circuit.