Re: submersible pump goes on and off
Lee S may be right about the control box monitoring the current. I don't really have any experience with these. However, there is one point I must take issue with.
Lee says that an unloaded motor (as in a well run dry) will draw more current. It is true that an unloaded motor will spin faster*, but a motor under load will draw more current than one that is unloaded. Otherwise, we'd all be trying to figure out ways to bog down our motors almost to the stalling point, in order to save electricity. It's a simple matter of energy used being proportional to work done.
(*Some motors do have speed governors which ensure a constant speed under load. Probably not found on water pumps.)
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.