Sure about that? I don't have my NFPA book here, but when I wired my house = some 12 years ago, I was required to use a grounding rod next to my meter/m= ain and then another ground bond wire back to my copper water pipe, under t= he PRV. Yeah I remember that one because the inspector made me wrap green = tap around the black wire to indicate its ground. -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of= Dave Tweed Sent: Friday, July 11, 2014 2:24 PM To: piclist@mit.edu Subject: Re: [EE]: Grounding SMPS and earthing. Vitaliy M wrote: > On Jul 11, 2014, at 10:26, Justin Richards wr= ote: > >=20 > > Earth and Neutral are connected > > together in the meter box where the power enters the house. >=20 > AFAIK this is not true in most cases, at least in North America. Earth=20 > is a separate conductor, connected to an earthing rod. It is MOST DEFINITELY TRUE in North America -- the neutral is REQUIRED to b= e bonded to earth at the main braker -- and ONLY at the main breaker. -- Dave Tweed -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t This e-mail (and any attachments) is confidential and may be privileged. A= ny unauthorized use, copying, disclosure or dissemination of this communica= tion is prohibited. If you are not the intended recipient, please notify = the sender immediately and delete all copies of the message and its attachm= ents. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .