Electric boiler 15kw - radiant floor

[Dr. Brown]

Hi guys,

I am working with my plumber to organize my radiant floor heating system. He recommended 15kw electric boiler for my shop. 38x34x14h in eastern Canada. Fully insulted, etc.

Now, the 15kw calls for an 80amp breaker. At the moment I am running 100amp service from my house (400amp main panel).
My concern is that with the boiler running during the winter months will I have enough juice to run my compressor (30amp) or welder (30amp). Of course, welder and compressor will not be run simultaneously. But I will also lights, chargers, etc. Should I be running 125amps out to the shop?

Cheers.

 

[wyliesdiesels]

15KW is ~63a. A compressor will have an in-rush of 4x-8x nameplate FLA. If compressor needs a 30a breaker its probably 5HP so 20-23a FLA.

the welder will also have in-rush currents when striking an arc but wont be as high the compressor motor.

Id say you may trip that 100a breaker if the boiler is on and the comp kicks on or you fire up the welder...

 

[Dr. Brown]

Thanks for the reply. That’s what I was thinking too.

The run between house and shop is about 150ft underground.

Here is the wire I have, but I have not buried it yet.

If I increase to a 125amp breaker can I still run this wire?


jungle gif

 

[wyliesdiesels]

Looks like a canadian wire product

I dont know canadian code but in the US #2 al is only good for 90a. I doubt its good for 125a in canada...