[RE-wrenches] Concentrics at 250 volts plus

[Max Balchowsky]

Most inspectors want to see a bond bushing following the array equiptment ground wire all the way back to the panel. We bring it back to a gutter under the equipment, then land it on a ground buss in the gutter. Everything else is also grounded here… This lug is then grounded either to an existing ground rod or ufer or, if required, the "new" ground rod.
 
Max Balchowsky
Design Engineer
SEE Systems
1048 Irvine Ave Suite 217
Newport Beach, Ca. 92660f
760-403-6810
"Building a Better Future For The Next Generation"



________________________________
 From: Corey Shalanski <cshalanski at joule-energy.com>
To: re-wrenches at lists.re-wrenches.org 
Sent: Tuesday, July 15, 2014 3:43 PM
Subject: Re: [RE-wrenches] Concentrics at 250 volts plus
 


Related question: How should we treat circuits that are less than 250V? Does the EMT need to be bonded at EITHER end?

Some of our local inspectors are requiring bonding around all concentric/eccentric knockouts, regardless of circuit voltage.

--
Corey Shalanski
Joule Energy
New Orleans, LA

ᐧ



On Tue, Jul 15, 2014 at 12:45 PM, <re-wrenches-request at lists.re-wrenches.org> wrote:


>Message: 3
>Date: Mon, 14 Jul 2014 15:11:44 -0700
>From: William Miller <william at millersolar.com>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: [RE-wrenches] Concentrics at 250 volts plus
>Message-ID: <52645F97-F231-4149-A8FD-D2E44E315AC5 at millersolar.com>
>Content-Type: text/plain;       charset=us-ascii
>
>Friends:
>
>Please help us settle a crew debate before we come to blows:  for circuits 250 volts and higher, do we need to bond EMT at both ends?  Or, if there is bonded cabinet with a concentric on one end and a solid, bonded metal cabinet on the other, do we need a bonding bushing on the concentric end?
>
>I say a conduit needs to be bonded only on one end. My misguided employee says both ends. Both cabinets are independently bonded.
>
>Thanks in advance.
>
>William
>Miller Solar
>
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