Looking over many instances of 240v setups and I think I have everything narrowed down as to what I want to do. Maybe the Doc can help with this almost last question.
Most people use half of the 240v supply into the control box to power the march pumps/lights/other things. Does doing that in any way mess with the GFCI from the spa panel? For instance, would running or starting/stoping a March pump trp the GFCI? Should the 120v stuff not come from the GFCI supply? If there is a ground fault on a 120 pump, would the spa panel GFCI still save me?
The way I understand how gfi works is that it flips when there is an difference in current between ground and neutral. I am probably wrong. I just wondered if using 120v from 1 leg would cause a trip or if 1 side was ground faulted, would it still save my skin.
It is convenient to run everything from the single 240v supply coming in, but I want to be sure it safely sound and correct. It seems like everyone does it this way but want to double check with an engineer type.
Paul