Hi all! Mid way through a little DIY soaking pool / hot tub (full thread if you're interested: DIY Concrete Block Soaking Pool - In Progress, Advice Welcome!!). And getting to the point where I need to finalize some electrical stuff. Don't know much about it, but want to make sure I understand how it all works and don't get anything wrong (or get anyone electrocuted!).
Here's the equipment I'll be hooking up (photos of heater/pump plate below):
- 240volt, 5.5kw heater (pulls approx 40 amps)
- 120volt, 1hp pump (pulls approx 10 amps)
- Small, 120volt pump for fountain (in future)
Here's the plan right now
- Install a 70 amp breaker in my main electrical panel
- Run wire (#4) from main panel, outside, through buried PVC conduit (probably 3/4 or 1"), to a sub-panel near the pool (total distance is about 60 feet)
- Sub-panel will be 4 space (8 circuit) (box is 125 amp max, but I'll only be installing 70 amp total in breakers)
- I'll install a 30amp, 240volt, 2-pole GFCI circuit in the sub-panel and wire the 5.5kw heater into that (4 wires, neutral, 2 hot, ground)
- I'll install a 20amp, 120volt, 1-pole GFCI circuit into the sub-panel and run that to an outlet where I'll plug in the 1hp filter/pump, and also run it to a 2nd outlet where I'll plug in the small, fountain pump
- Leave space for another 120volt, 20amp GFCI circuit in future if I need
- Bonding wire (already tied into all the concrete) will be tied into the heater and filter/pump
Just a few questions (sorry if they're dumb/obvious):
- Does the breaker I'll install in the main panel to connect to the subpanel have to be GFCI protected? Does it have to be 70amp (since the total I will potentially install in the subpanel is 70amp)? Right now I've only ever seen 60amp max GFCI breakers for sale so not sure how that'd work?
- Shows my limited knowledge, but I see that the 2-pole circuits are listed as 120/240volt. So what exactly determines if a device (outlet, hard wired heater, etc) will use the 120 volts or 240 volts?
- Any other insights or comments or things you notice that look wrong?
Again, my electrical knowledge is limited and so I'm happy for any advice or feedback. Thanks!