This is an old thread, but hopefully an expert will see and answer...
I am looking to do something similar. I have a 50a breaker in the main panel that I can't change. I have a 50a spa panel, and I'm building a 30a control panel.
I plan on adding a din rail to the spa panel, with a 30a double pole breaker for the 2 hot lines. Should I also add a 15 or 20a for the neutral? The neutral will only be carrying current from pumps and housekeeping power.
Or, do I need to add the 15a breaker in the control panel to one of the hot wires after the power to the heating elements splits off?
The second option seems more standard, but the control panel is going to be crowded and I'd like to move as much as possible to the spa panel.
Many thanks
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