Latest Discussions : Electrical & Lighting

JONINSACTO

01:30PM | 11/06/06
Member Since: 02/03/03
77 lifetime posts
I have an old house where the old fuse panel has been run over to a new service panel with breakers. The old panel has 4 fuses and they are now on their own breaker. Lately this breaker that controls the old fuse panel has been tripping the breaker. I flip the breaker off and then on and all is usually back to normal. The other night it was trippijng it and I would have to wait a couple of minutes before it would reset. The weird thing is that it does not throw everything off that are on these old fuses. It trips the breaker and some of the power on some of these fuses still work until I throw the breaker to reset it. Everthing has been fine like this for 20 years or so with no problems. I have not recently added any new curcuits or additional appliances. Last summer it was doing this then & I cleaned the connections at the breaker and tightened them up & it stopped.

Shouldn't it throw everything that is on these fuses off ? I plan to pull out the old fuses and look for corrosion & blackening in the fuses for any tell tale signs. Should I just put in new fuses even if they appear ok and make sure all the connections look clean & tight ? Any other ideas ?

Billhart

02:52PM | 11/06/06
Member Since: 04/25/05
1915 lifetime posts
Without knowing more of the details I would expect that the fuse panel is wired with 240 and should be feed with a two pole breaker.

The two pole breaker will be double wide and might have one handle or two with a connector between the handles.

With a two pole breaker if it trips ALL of the circuits should be off when the breaker trips.

So I supsect a breaker problem.

However, with a house that old it is possible that the wiring has been modified many times and may have some "creative improvements" such as some of the circuits being feed from both the fuse box or the circuit breaker panel.

Now as to why the breakers are tripping again with an old home like this there might be problems with insulation of the wires, extra.

It would help the actual curent loads where measured with a clamp on amp meter.

But based on your earlier problems, along with the fact that only part of the loads turning off, that you have a defective breaker.

And check for corrosion or heat damage age the bus bars where the breaker connects.




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