I'm not surprised, but as I'm not in the US, it's only of academic
interest.  As I said, I'm more interested in the physics and the
specification of the parts.

Is the label required to be different to that specification?  If so,
that's a can of worms.

On Mon, Feb 16, 2015 at 06:20:51PM -0600, Richard R. Pope wrote:
> James,
>      In the US the NEC is a legal requirement. Local codes must be at=20
> least as restrictive as the NEC. Also if the wiring is not done to code=20
> and the fire is caused by the poor wiring the insurance does not have to=
=20
> pay. If someone is hurt or killed than the person who did the wiring is=20
> now open to criminal and civil charges.
>      I always consider the code as a starting point. As I said before I=20
> wire all of the 15 amp 14 gauge circuits to 20 amp 12 gauge specs. I=20
> also put in any where from 20 to 100% more circuits depending on the=20
> life style of the home owner. In Wisconsin 100 amp panels are required.=20
> I always install 200 amp or larger panels.
> Thanks,
> rich!
>=20
> On 2/16/2015 6:08 PM, James Cameron wrote:
> > Agreed.
> >
> > I've always considered the critical specification of a circuit breaker
> > to be the highest current it can hold and not trip, assuming standard
> > test conditions ... such as voltage, temperature, humidity, magnetic
> > fields, vibration, gravity, orientation, mounting, atmosphere content,
> > and atmosphere pressure.
> >
> > What some provincial code then says about it, and how it requires any
> > relabelling or use, is less interesting than the physics.  But if the
> > label is required to be different to that specification, that's
> > something to watch out for.
> >
> > On Mon, Feb 16, 2015 at 06:40:20PM -0500, Allen Mulvey wrote:
> >> See:
> >> http://ecmweb.com/basics/sizing-circuit-breaker
> >>
> >> "A CB is designed and evaluated to carry 100% of its rated
> >> current for an indefinite period of time under standard test
> >> conditions."
> >>
> >> The important part is "under standard test conditions." In
> >> the real world the circuit breaker is likely to heat up
> >> above "standard" test temperature. The 1996 NEC code
> >> compensates for this by requiring you to use breakers rated
> >> at least 20% higher than the anticipated load.
> >>
> >> Allen
> >>
>=20
> --=20
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--=20
James Cameron
http://quozl.linux.org.au/
--=20
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