Yes NEC 2008 250.32B EXCEPTION is that to which I refer When the debate is lost, slander becomes the tool of the loser. Socrates
-----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Monday, September 28, 2015 5:30 PM To: Reflector Elecraft Subject: Re: [Elecraft] Grounding On Mon,9/28/2015 11:26 AM, Kenneth Talbott wrote: > Several years ago the NEC relaxed the requirement that safety ground > and neutral be connected at only one place. Now you may leave the > bonding screw in place in remote panels. http://ecmweb.com/code-basics/grounding-and-bonding-part-2-3 The link above is from Mike Holt, widely considered an authority on electrical codes. He makes his living teaching and writing about the topic. This is part of his review of revisions to Article 250, Grounding and Bonding, that appeared in the 2011 code. In the very last paragraph, are these words: "As a rule, the neutral should never be connected to the enclosure or equipment grounding conductor anywhere except in the service disconnects and the secondary side of separately derived systems. Objectionable neutral current presents a real danger and can damage equipment as well as cause fires and electric shock or electrocution." For all practical purposes, the 2011 code is the most recent, because it usually takes 5-6 years for local authorities to adopt a revision. Upon reading your email, I reviewed a draft of the 2014 code, and the requirement for one, and only one, neutral to ground bond is still part of it. The only "remote panel" in which a bond would be permitted between neutral and ground is one in a second building where ground is not carried between buildings, or when the remote panel is for a "separately derived system." A system is separately derived when fed by a transformer. The practice of not carrying ground between buildings no longer permitted, but is grandfathered in existing installations from earlier versions of NEC. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to ktalb...@gamewood.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
