[RE-wrenches] Concentrics at 250 volts plus

[Will White]

It's still a good best practice to bond both ends in case of a fire if the conduit becomes separated in the middle it will still be bonded.

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William Miller
Sent: Tuesday, July 15, 2014 1:47 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Concentrics at 250 volts plus

Kelly:

Just as I suspected.  I wish you could be here to share the lunch I have earned on my bet.

Thanks,

William


[Gradient Cap_mini]
Lic 773985
millersolar.com<http://www.millersolar.com/>
805-438-5600

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kelly Larson
Sent: Monday, July 14, 2014 10:16 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Concentrics at 250 volts plus

Hi William,

The requirement for bonding on BOTH ends comes when the wire though the conduit is a GEC.  For EGC, just one end of the conduit is sufficient.

Blessings,
Kelly


~~~~~
Kelly Larson
707-223-3209

Box 504
Ukiah, CA 95482
Electrical Engineer
NABCEP Certified Solar PV Installation Professional
IREC Certified Master Trainer for Photovoltaic Installer
CA Electrical Contractor# 868189
SolarKelly.com<http://SolarKelly.com>

On Jul 14, 2014, at 3:11 PM, William Miller wrote:

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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