Is the rated holding current printed anywhere on the breaker?

As previously quoted by Allen, "A CB is designed and evaluated to
carry 100% of its rated current for an indefinite period of time under
standard test conditions."

So what is the technical difference between a rated holding current
and a rated trip current?

On Mon, Feb 16, 2015 at 06:45:04PM -0600, Richard R. Pope wrote:
> James,
>      Two things are important for installers. The amp rating that is=20
> printed on the handle.. Then there will be a label on the side and the=20
> installer needs to make sure that it is UL certified. Whatever is on the=
=20
> handle is the rated trip current. No other information is required by=20
> the installer.
> Thanks,
> rich!
>=20
> On 2/16/2015 6:37 PM, James Cameron wrote:
> > 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
> >> least as restrictive as the NEC. Also if the wiring is not done to cod=
e
> >> and the fire is caused by the poor wiring the insurance does not have =
to
> >> pay. If someone is hurt or killed than the person who did the wiring i=
s
> >> now open to criminal and civil charges.
> >>       I always consider the code as a starting point. As I said before=
 I
> >> wire all of the 15 amp 14 gauge circuits to 20 amp 12 gauge specs. I
> >> also put in any where from 20 to 100% more circuits depending on the
> >> life style of the home owner. In Wisconsin 100 amp panels are required=
..
> >> I always install 200 amp or larger panels.
> >> Thanks,
> >> rich!
> >>
> >> On 2/16/2015 6:08 PM, James Cameron wrote:
> >>> Agreed.
> >>>
> >>> I've always considered the critical specification of a circuit breake=
r
> >>> 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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