I'd like to test if my hot tub was connected to ground.
The hot tub is underground and its electrical panel is not easily accessible. I'm trying to figure things out without access to the hot tub's panel.
The hot tub is 240V single-phase (TT earthing system) and is connected to a 10mA GFCI in my house's main panel. I have verified this connection and it's definitely taking current from the GFCI.
What I don't know is if the guy that installed it wired the ground properly. I tried taking a multimeter to test for continuity between the house's ground and the hot tub water, but it didn't show anything. If I test for voltage between a phase and the hot tub water, I get 240V.
Is the hot tub water itself not supposed to be grounded?
Any other test I could perform or that I could ask a licensed electrician to perform?
The GFCI never tripped so far, so maybe no valid reason for concern. Just trying to make sure as there are 2-year-olds using the hot tub.
Best Answer
You should not see anything if the ground were properly connected. Most of the time, the hot tub is fiberglass and the piping is plastic, so there should be no connection to ground, EXCEPT via the pump housing, assuming a metal volute (the chamber part of the pump) and a proper grounding conductor on that pump housing. So showing no voltage between ground and the water means they are are the same potential, which is what you want.
As you should in your system, because the neutral of your 240V TT system is connected to ground somewhere and so is your water (again, through the pump volute and the pump body being properly grounded), so measuring between those two points should show as the full 240V.