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Posted by udarrell on April 11, 2007, 4:18 pm
Mr_Bill wrote:
>On Apr 11, 5:18 am, trad...@optonline.net wrote:
>
>>"The spec sheet says to use branch circuit protection of 30A minimum
>>and 35A maximum. The spec also says to use wire of at least 22A
>>ampacity. This all seems reasonable so far.
>>Am I the only one that sees a problem with the above? (NO)
>>
The conductors you use should always exceed the ampacity of the breakers
that are protecting them!
The purpose of the breaker or fuse is to prevent exceeding the ampacity
rating of the conductors!
>Actually, this thought occurred to me right off the bat.
>I can assure you that the factory spec says 22A ampacity,
>30A min breaker, 35A max breaker.
>
If the conductor rating is 22-amps then I would want a 20A or less
breaker on it.
Run at least 35A rated conductors, then use a 30A breaker.
The breaker must be sized no larger in amp size than the ampacity rating
of a conductor
after de-ration calculations have been performed to find the maximum
ampacity of that conductor.
>In any case, I am using 50A ampacity (8 ga) wire, and a 30A breaker.
>
Since when does the Electrical Code allow the ampacity capacity rating
of the wire to be lower than the breaker that is supposed to protect it
from exceeding its conductor amp ratings!
The ampacity of the conductors should always be greater than the breaker
rating that is protecting it from exceeding its amp rating.
-udarrell
--
WISDOM PRINCIPLE DIRECTED EMPOWERMENT COMMUNICATIONS -
THE REAL POLITICAL ISSUES and WISDOM BASED PEOPLE EMPOWERMENT
http://www.udarrell.com/
http://www.udarrell.com/my_pages2.htm
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