Question about Electrical Supplies
Hello. I have an old(30? year) breaker box(ITE) and recently replaced my water heater with one that has the same amps element. The wires are cool and the circuit breaker for the heater is fine. But my main keeps tripping. It may go for 2-3 days or twice in the same day. I have 200 amp service with 60A hot tub, 40A range, 20A water heater, 30A dryer, well is 120V 20A, 8 more 15A 120V. Til the water heater was replaced, no problems. A couple of months ago, I replaced the control unit in the hot tub and it seems to run more often than the old one, but the main did not trip. No wires are warm after the main trips and it turns back on. Could the main be bad?? I ordered a new main breaker as no one had one in stock within 75 miles(figures). Any help appreciated.
Get acceess or rent an amp clamp meter with a "max hold" and clamp it on each line wire coming into the box (if you're not experienced in this hire an electrician being tht it can kill you if not done correctly and safely) when it blows check amps to each "leg" and see if it is over 200 amps. if it is under, the main breaker should be replaced . If it is over, clamp it on the "hot" side of each
circuit that you suspect may be pulling too much. If this all comes out ok, have the main service connections to the main breaker checked for being tight. This is a last resort, but I'
ve seen them heat up from being loose and then throw the main. The over all amps could be pulling too much, but it takes alot of things running at the same time to throw a 200 amp main.
Posted on Jan 17, 2009
Replacing the main is a possibility and i saw someone suggestion to ck load on each leg of power , also a good idea but one thing i have also seen do this is a loose or corroded connection in the meter base or disconnect which causes a process called electrolysis that is a flaking away of the conductor itself in the meter base or disconnect feeding the panel main breaker and causing heat build up internal to breaker and making it trip but if you replace the main that is the time to check all these connection and it would not hurt to apply a little no lock or some other brand of oxidation inhibitor
Posted on Feb 07, 2009
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Posted on Jan 02, 2017
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