[RE-wrenches] Grounding - Exposed Metal Part

[Drake]

If the plates are bolted together,  then they are bonded to each other.

At 01:33 AM 7/27/2012, you wrote:

>Mark,
>If you look at NEC 250.104(C), you'll find that you have to bond structural
>metal that is "likely to become energized". The phrase "likely to become
>energized" is not defined, and is up to the AHJ. I would guess most AHJ's
>would consider the second metal plate to already be bonded since it is
>electrically continuous with the first metal plate, because they're
>touching. I also doubt they would consider it "likely to become energized"
>because you bonded the first metal plate. Just my opinion.
>
>-Hans
>
>-----Original Message-----
>From: re-wrenches-bounces at lists.re-wrenches.org
>[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mark Frye
>Sent: Wednesday, July 25, 2012 7:29 PM
>To: RE-wrenches
>Subject: [RE-wrenches] Grounding - Exposed Metal Part
>
>A bare metal plate is connected to a conduit which serves as an equipment
>ground. The plate is grounded and needs to be grounded because it could
>become energized both by being contact with the conduit which could become
>energized and also by coming into contact with the current carrying
>conductors themselves.
>
>A second bare metal plate touches the first plate but could not come into
>contact with the current carrying conductors.
>
>True or false, the second plate does not have to be grounded (bonded to the
>first plate) because the first plate is already grounded and therefore could
>not cause the second plate to become energized?
>
>Any Code references to support your opinion?
>
>P.S. I believe: "false", the second plate must be bonded to the first plate
>because it may become energized by the first plate regardless of whether or
>not the first plate is actually grounded, but I can't find references in the
>Code to support this.
>
>Mark Frye
>Berkeley Solar Electric Systems
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