Originally Posted by Chugmaster
I am considering doing something similar so that I can run elements in my BK and HLT at the same.
I'd like to use my 120V 15a source to power my HLT and my 240V 30a source to power my BK.
Wouldn't there be an issue with grounding the box if I have 45a coming into it and the max AWG ground that I have is 10AWG (although there will also be a 14AWG there)
This is a bit tricky... Here's a non-electrician's take:
I would be tempted to omit the 14 AWG ground to ensure that your 30A source wouldn't try to ground out through it (thus burning it up). This is assuming you NEVER plug the 15a circuit in without the 30a circuit present. It is unlikely that both your 15a and 30a circuits have a ground fault at the same time.
But maybe the more grounding the better, so use both? Or run a dedicated grounding clamp of sufficient gauge to a good known ground source with acceptable current carrying capacity?