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i have a 50+ year old house with 100 amp servicebox ...

Sent to General Experts February 16, 2006 3:06 p.m.

i have a 50+ year old house with 100 amp servicebox underneath the meter, then a 60 amp double pole breaker feeding the inside box consisting of 4 /60 amp buss fuses to 4 srew in fuses 30 amps, I had flickering lights for awhile ,changed the outside 60 amp breaker, everything fine for awhile, now i have 2 of the 4 lines out in the house, screw in fuses ok, new outside breaker ok, tightened all connections inside and outside box, ground from outside box still connected to ground rod, 1 buss fuse is out, everytime i change it and power up i hear a deep sounding Zap, and the buss is out again.
where do i check next??? is this a problem inside the house or between the 2 boxes,? help??

Customer (name blocked for privacy)

Status: Closed Value: $10

Info Request
February 16, 2006 3:21 p.m. (14 minutes and 51 seconds later)

REPLIED to Info Request

I am having a hard time understanding your arrangement. You say that you have a 2P 60 breaker feeding an inside box that has 4 60A fuses and 4 30A fuses. Each of thise 8 fuses feeds a circuit inside the house. Is that correct?

What do the fuses feed? What kind of wiring is inside your house? Romex? Conduit and wire?

__________________
Thanks very much and good luck.

Steve Gardner -- Electrical Engineer -- 100% Positive Feedback on 64 General Accepts
Computer geek, mechanic, tutor and musician.

Reply to Steve Gardner
Sent February 16, 2006 3:41 p.m. (20 minutes and 39 seconds later)

the 4 /60 amp fuses are buss fuses,the other 4/30 amps are the screw in type fuses for each
run of line 1 for ceiling lights 1 for wall sockets.

Customer (name blocked for privacy)

Answer
February 16, 2006 4:05 p.m. (23 minutes and 16 seconds later)

ACCEPTED

OK, I still don't quite get it but here is my advice.

A fuse blows because of of an overcurrent or short on part of the circuit that the device is protecting. I can't think of any situation that would cause a fuse or breaker to blow because of something upstream.

If you have a fuse blowing, you need to check the circuit. If nothing is plugged into that circuit then you have a short to ground or short to neutral.

You need to figure out what it is that the circuit controls and then check that circuit out.

I can help you further. Do you have a multimeter?

__________________
Thanks very much and good luck.

Steve Gardner -- Electrical Engineer -- 100% Positive Feedback on 64 General Accepts
Computer geek, mechanic, tutor and musician.

Reply
Sent February 16, 2006 4:07 p.m. (2 minutes and 14 seconds later)

yes on multimeter, the busses are i think in line with the screw in fuses 1 buss for each
line

Customer (name blocked for privacy)

Reply
Sent February 16, 2006 4:18 p.m. (11 minutes and 6 seconds later)

well i guess i hit the wrong key on this thing so i appreciate you trying to help

Customer (name blocked for privacy)

Answer
February 16, 2006 6:56 p.m. (2 hours and 38 minutes later)

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Steve Gardner -- Electrical Engineer -- 100% Positive Feedback on 64 General Accepts
Computer geek, mechanic, tutor and musician.

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