James,
     Correct!
Thanks,
rich!

On 2/16/2015 5:45 PM, James Cameron wrote:
> Okay, that's fine.
>
> You didn't mean to say that it is "ok for a breaker to trip at less
> than what the NEC specifies but not at a higher current."
>
> You meant to say that it is "ok for a breaker to trip at less than
> what the NEC specifies, but not ok for a breaker to not trip at a
> higher current than what the NEC specifies."
>
> I do understand what you were trying to say, I just found it hard to
> be sure of that.
>
> On Mon, Feb 16, 2015 at 05:14:55PM -0600, Richard R. Pope wrote:
>> James, Allen,
>>       We have to be careful here. What I am talking about is the rated
>> trip current. A circuit breaker with 20 amps on the handle which is the
>> rated trip current will trip under two different conditions. The first
>> condition is if a sudden current of 20 amps or more is drawn by the
>> circuit. The second is if a current of 80% of the rated trip current,
>> which is 16 amps for a 20 amp breaker is drawn for an extended time
>> period. This has nothing to do with what the contacts are rated at. This
>> only deals with the circuit conditions.
>>       You can go to the manufacturers website and find out what all of
>> the ratings are. Yes, if the voltage were to go very high for some
>> reason the breaker would trip if the fuse on the primary side of the
>> transformer didn't blow first. In the US we have two different voltages
>> available in most of our homes. It is single phase 120 and 240 volts.
>> Thanks,
>> rich!
>>
>>

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