Re: Simple electrical question

Posted by John T on January 14, 2013 at 18:17:07 from (71.0.67.68):

In Reply to: Simple electrical question posted by Bkpigs on January 14, 2013 at 17:27:12:

I know the proper way to do all this, its indeed SIMPLE (for an engineer or electrician) as you stated HOWEVER based on your question I don’t think you understand the concept of “shared neutral” when and how its permissible and safe, and what are known as “multi wire branch circuits” so my best professional advice is to seek trained professional electrician help. THAT BEING SAID HERE ARE A FEW TIPS

1) I NEVER mixed lighting branch circuits with convenience outlet branch circuits. Id have lighting branch circuits and Id have outlet branch circuits but NEVER both on the same.

2) Multi wire branch circuits are permissible but NOT for rookies or amateurs. On those you can (if all is done right) run a branch circuit consisting of 2 hots that share a common single neutral. If BOTH phase A and B were pulling 12 amps, the Neutral current would be zero.

3) Its NOT good to use multi wire circuits with high inductive loads like lighting ballasts and its NOT good to use a multi wire circuit where some loads are inductive and some are not because due to harmonic currents, the neutral may be overloaded

4) I suggest you DO NOT try to share Neutrals,,,,,,,DO NOT use a multi wire branch circuit if you don’t know what youre doing or what it is or how it works and when its permitted

5) I DO SUGGEST you run switched branch circuits complete with Neutral to the outlets you want controlled by a switch and run branch circuits out to outlets that are unswitched always hot and run separate branch lighting circuits AND DO NOT TRY TO SHARE NEUTRALS NOR USE MULTI WIRE BRANCH CIRCUITS unless and until you know exactly how to use them

CAUTION!!!!!!!!!!!!!! This is NOTTTTTTTTTTTTTTT one of those questions where you should rely on uneducated or ignorant lay opinions or rookies or jack legs or Billy Bobs !!!!!!! The concept of shared neutrals or multi wire branch circuits is NOT for rookies. DON’T TAKE MY WORD FOR IT see what trained professional electricians and engineers and electrical techs and the NEC has to say

YOUR 220 VOLT QUESTIONS: If the neutral was to open, the 120 volt loads that use that Neutral will not work. If theres a straight 240 volt load, it does NOT use Neutral so works without one. Its 120 volt from either hot to Neutral and 240 line to line.

Neutral is a live current carrying GrounDED Conductor,,,,,IT IS NOT THE EQUIPMENT GROUNDING CONDUCTOR. Never mix n match n substitute one for the other lest you get killed. Neutral is Neutral and Equipment Ground is Equipment Ground UNLIKE SOME ROOKIES THINK THEY Are notttttt the freaking same.

Im NOT trying to start a fight or argue, just giving the best professional advice to save a life or prevent a fire here. ALSO I cant explain how to do all this here in a few paragraphs, sorry

John T Retired electrical engineer

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