Sub-brker box, runs 2 sheds w/100'drct bury #12 w/2 splices. Sw keeps tripping. Have check all plugs & switch?

Answer 1

I would think you have leakage at the splices, or perhaps at defective insulation underground. Disconnect the conductors to the sheds, and see if the breaker holds.. If not, an ohmmeter could tell you if you have a ground or a short.

Answer 2

#12at a 100 feet is not real good especially running two sheds..and at worst..it has 2 splices in it..It should be ran single strand...or at least from junction boxes at splices.. Also failed to mention was these two sheds..what are you runing? table saws, heaters,power tools, compressors etc? You may have it overloaded current wise..or the splices are wet or damp being direct buried with splices..this would more than likely be the problem.

Answer 3

Do you mean you have splices buried? This is bad. Very bad. Splices need to be in a liquid tight box. I suspect you are getting leakage at the splices creating a high impedence short. that could trip the breaker.Safety hazard too.