"Doug Miller" wrote in message
et...
In article , "Eigenvector"
wrote:

"M Q" wrote in message
news:6u6ti.353$V53.338@trnddc08...
Doug Miller wrote:

In article AW%si.115$zg3.49@trnddc04, M Q
wrote:
...

Wrong. Please familiarize yourself with the NEC before attempting to
answer electrical questions.

A 60A breaker is perfectly fine:

"Devices Rated 800 Amperes or Less. The next higher standard
overcurrent
device rating (above the ampacity of the conductors being protected)
shall be permitted to be used, provided all of the following conditions
are met ..." [2005 NEC, Article 240.4(B)]

The conditions can be summarized as not a multiple-receptacle circuit,
no
matching standard breaker, and next size up not 800A.

Mea Culpa. I was wrong on two points. Thanks for correcting me.

I will now slink off with my tail between my legs.


You got better treatment than I did from him.

If I offended you, I'm sorry - it was unintentional.

--
Regards,
Doug Miller (alphageek at milmac dot com)


Don't worry about, I have thin skin lately.

But back to my question, which was more out of interest than contesting a
ruling. The 5 extra amps is more than just the wire, what about the device
at the other end of that wire - it'll be taking on an additional 5 amps too.
Maybe not important, if it has its own fuses, they'll blow too. I was just
curious is all.

Now this next part is just my mind asking questions, not making personal
attacks.

A lot of people are firing back claiming the wire can handle 65 A, 60 A,
2000A, whatever, those current carrying capacities aren't advertised on the
wire bundle, so how would an electrician know that? I'm presuming an
electrician isn't schooled at the same level as an Electrical Engineer. So
looking at a wire and being able to tell the ampacity of it seems liberal to
me. When they allow higher breaker sizes it also tells me that the NEC
conventions are largely anecdotal or arbitrary as opposed to calculated or
theoretical values - which is even more worrisome to me. I would expect
them to state restrictions and rules more along the lines of "This is the
theoretical limit of this particular wire, plus a safety margin of 1.5 - you
may not use something higher than this value" Rather than, "Just use the
next highest one, they don't make the correct one for it." If they were to
state something like that, I would also expect them to qualify it by stating
the reason why they make that allowance. Like I said, just me asking
questions.