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Speedy Jim Speedy Jim is offline
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Default Fuses and circuits

Terry wrote:

On 26 Apr 2007 17:05:32 -0700, Big_Jake
wrote:


On Apr 26, 7:04 pm, Terry wrote:

On Thu, 26 Apr 2007 16:30:18 -0400, Speedy Jim wrote:

snip




Oh, also, the wiring looks to be 12 or 14 ga (cloth covered, older wire so
it's hard to tell), and the fuses are all 30A. I'm assuming I should
mention this to the owner and mention that he should get the correct sized
fuses in?

snip


You are probably not in a position to dictate to the
owner what he should do about all these problems. But at the
very least present him with some kind of statement of what was
found, for your own benefit if nothing else.

Jim

What do you think he meant by "I should mention this to the owner?"


Anyone have the thought that one of the fuses may have been the "main"
and the other fuse the "circuit"?


JK



Mains are not screw in. They are pull out type.



Well, not always. I can recall clearly one service
which was rated at 30 Amps 120/240V.
It used 2 plug fuses for the Mains protection and a bank
of 4 plug fuses for the 4 branch circuits (no Neutral fusing).

Much more interesting though was a large branch circuit
panel in an elegant mansion built in 1900. This panel
came off a 3-wire feeder rated at 60 Amps. The interesting part
was that most of the branch circuits used an Edison 3-wire circuit
where the Neutral was shared. BUT.....they fused the shared Neutrals!!
When one of those Neutral fuses opened, the circuit voltage on any
one branch could be anything from near Zero all the way up to 240V !

Jim