|To:||Jim Lux <firstname.lastname@example.org>|
|Subject:||Re: [TowerTalk] ampacity, overcurrent protection, etc.|
|From:||Gary Schafer <email@example.com>|
|Date:||Tue, 25 Jan 2005 18:17:02 -0500|
Hi Jim, I have to take issue with you on some of this:
Jim Lux wrote:
One does depend on the other. There is sometimes more leeway. You can sometimes run more current on a given conductor size than normal but you can still can not way undersize a breaker on a given size wire.
This is standard.
This is also standard.
Also standard for any installation.
Over current protection based on the load size still doesn't negate the proper wire size for the load and breaker.
Over current protection must in addition be small enough to trip the breaker before the wire burns open.
There is also a provision in the code that allows an undersize line and breaker to feed the kitchen stove. It seems a very stupid thing to do though but it is legal. The idea is that you will not have all the burners and oven on at the same time. But if you should turn them all on at the same time (cooking thanksgiving dinner) you may have nuisance breaker interruptions. Go figure.
But the bottom line is that I think you would be hard pressed to find any exception in the code that would allow for a breaker to be oversized to the extent that was being discussed. #10 wire with a 50 amp breaker!
Keep in mind that the panel feeding that line is in the house so part of that line falls under what the house is subject to. The other end of the line at the barn is inside (I assume) and falls under a structure related code also.
Anybody can do what ever they want to do but giving that type of advice here may get someone in trouble in more ways than one.
73 Gary K4FMX
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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