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Tool Talk Discussion Forum

Re: Another Billy Bob electrical question

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Author  [Modern View]

06-18-2013 16:29:45

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Hey, doc, why is it 'code' to parallel very large wires such as 1/0, but not smaller wires?

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John T

06-19-2013 15:54:07

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 Re: Another Billy Bob electrical question in reply to JMOR, 06-18-2013 16:29:45  
I cant speak for Dr. nor do I have the latest NEC, but at our large industrial military complex the ONLY times we used paralell conductors was for large conductors such as if I recall 4/0 and 250 MCM and larger. Then as mentioned they were exact in length and the paralell lugs n bolts were all torqued the same etc. In smaller conductors we simply used the correct ampacity wiring.

Fun chat John T

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dr sportster

06-19-2013 09:01:24

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 Re: Another Billy Bob electrical question in reply to JMOR, 06-18-2013 16:29:45  
Because it is for situations where the conductors are mostly used as feeders to supply larger amounts of current .In smaller conductors it just makes sense to go to the proper size conductors. In a large feeder situation there are limits to what can fit into conduit and still supply the amperage . There commonly is not EMT larger than 4" and space limitations in crowded ceiling and mechanical rooms have limits.Parrallel runs must be kept close to the same length and terminated at the same bus to avoid overheating one set the current is favoring. In smaller circuits what is called for is one set per circuit of correct size wires. How overcomplicated would it get if everyone started paralleling 12s and 10s etc. Junction boxes would be a nightmare.Terminations would have to be equal and when not landing on large bus that would get complicated too.

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