rmcderm313 Posted August 30, 2021 Report Share Posted August 30, 2021 Hi All, I've been testing/fixing my pumps using a 120v wall plug for short durations. I've found in some cases that on 120v a pump won't spin up without help, but when I hook it up to the 240v connection in the tub it works fine. I have an unused 240v dryer outlet which is a NEMA 10-30 style from my research. I'd like to use this outlet to bench test my pumps on 240v. Can I just use a pump cable and replace the board connection side with a 240v NEMA 10-30 plug? I do realize that I could also just plug the pump into the board with it outside the tub, but honestly the less I can touch the board the better I'll feel. When the tub is working I'd much rather leave things alone. Is 240v power from this type of outlet OK to run a 240v hot tub pump? Thanks for any insight. Rob Quote Link to comment Share on other sites More sharing options...
Cusser Posted September 1, 2021 Report Share Posted September 1, 2021 If I was in that situation, and knew what I was doing, I would likely try that myself, and just be very careful. On those older 3-terminal 240VAC connections, there needs to be a 4th/separate grounding wire. I can't remember offhand which of the two terminals are "hot" legs and which is the neutral, see Google. 1 Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted September 1, 2021 Report Share Posted September 1, 2021 The ground is the L shape, and it is grounded. It does not have a neutral, so cannot run any 120v components, but a 230v pump doesn't need a neutral. The 4 prong plugs have a neutral as well. 1 Quote Link to comment Share on other sites More sharing options...
rmcderm313 Posted September 1, 2021 Author Report Share Posted September 1, 2021 Thanks to you both. I'll do some more research and make up the plug. Then stand back and flip the breaker It sounds like just ground to ground (green) and then black to one hot prong and white to the other. -Rob Quote Link to comment Share on other sites More sharing options...
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