Neutral to Case connection

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jdhumphrey59

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I teach NEC at a local college using Mike Holt material. The group of students with 10 to 20 years of experience asked a question I couldn't answer. I stated that It's a violation to have a neutral to case connection on the load side of the service equipment. There comments were when did that change? As long as I've been in electrical work and instructing it's always been that way I told them. After showing them some PPT slides showing objectionable current, they saw the danger. At break several students said at there own homes where they have installed a sub panel , they now realize they have problems. If anyone can help on dates that this was first in the code book it would be helpful.

Thanks Dave Humphrey
 
Re: Neutral to Case connection

You must be kidding Mr. Humphrey. I can't imagine anyone in the trade for 10-20 years not knowing that a grounded conductor mustn't be bonded beyond the service. Of course there is the clothes dryer and cooking equipment exception, but I thought it was common knowledge you never bond the neutral in sub panels. I learned that before I was even in the trade when I was in Vo-tech. It's probably the only thing I retained from that class, but that's my own fault.
 
Re: Neutral to Case connection

Whats more important is to discuss why its not allowed to have a neutral to case connection on the load side of the service.
 
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