The installer said it could be that the box is weak and I should go to a 40 amp breaker
But my heat strips are 10mk
And 30 amps should be enough
I am wondering if he miswired the thermostat or should I go to a 40 amp breaker?

Try responding within your question by scrolling down. To answer you though... your A/C calls for a certain AMP size... you should be able to locate this on the side of the outdoor condensing unit. If it is below 30 then use a 30 if it is above 30 then you need to step up to a 40. If it is sized properly then you have a grounding issue. If it only pops when the compressor kicks on it could be that your windings in the compressor are grounding themselves. Let me know what it calls for and let me know if the later part of my response about when the compressor runs is correct.

The problem seems to be that the installer purchased the wrong heat strips
The heat wiring and whip and breaker are all 30 amp
But the installer purchased 60 amp heat strips 10kw rating
My house is only 1000 sqft so I don't need this much especially since I am running a heat pump in tandem with my air handler
Despite the fact that my electrician told him that we needed 5 kw heat strips the installer felt he knew better and took it upon himself to purchase 10kw heat strips


Thank you for your answer.

Maybe the heat loss ratio vs equipment truly called for the larger strips... an electrician is hardly qualified to do a Manual J rating on a home. May want to purchase a 60amp breaker... Good luck and your welcome.

Hmmm good point on the electrician not being qualified
However the electrician is the one who did the wiring and they had a discussion as to what wire the electrician should install vs what was necessary in the house
The heat installer was actually the one who first agreed that we could get away with 30 amp
Even though he recommended higher
So we all agreed on 30 amp
So the electrician wired up the whip the box and the breaker for 30 amp then the installer changed his mind

So now my option is to either buy a 5kw heast strip or disconnect one of the strips to make the 10k a 5 k

Thanks for your response much appreciated