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#13375 - 09/02/02 09:36 AM Fire or safety concerns about receptacle loads
Elzappr Offline

Registered: 12/20/01
Posts: 273
Loc: Oregon
Art 210 requires stationary equipment that takes up 50% of a circuit's capacity to be a dedicated circuit. Other than engineering or usage convenience considerations, is there a safety issue? I recently had to repair a damaged installation that apparently was modified by a maintenance person AFTER initial construction, so that it violated the 50% rule. They tapped into a large role up door opener (in a commercial building) to provide power for a couple of convenience outlets. I don't like driving customers away by re-engineering existing installations because of code issues which aren't obvious safety issues. Anyone have some perspective about what is so dangerous about violating the 50% rule?

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#13376 - 09/02/02 12:41 PM Re: Fire or safety concerns about receptacle loads
sparky Offline

Registered: 10/18/00
Posts: 5545
the fallicy is, that anyone can 'dedicate' a circuit without consultation......

#13377 - 09/02/02 12:45 PM Re: Fire or safety concerns about receptacle loads
pauluk Offline

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
As I see it, the problem with violating such a rule would be that if/when other high-power appliances are connected to the circuit, there could be a high incidence of nuisance tripping.

That in itself wouldn't be a problem so long as the OCPD and cables are properly sized. The only real safety issue I can see is that regular nuisance trips might lead to some uninformed person deciding to uprate the breaker in order to "solve" the problem. Then it could most definitely be a safety problem.


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