Notched hole for GEC

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don_resqcapt19 said:
I have not seen any documentation that a GEC running through the enclosure wall is any type of a problem or choke as long as the GEC is connected to the metal enclosure at some point within the enclosure. There is lots of info on the problem when you run the GEC through a ferrous raceway without making a bonding connection. The small 1/4" KO on many meter cans is intended to be used to run the GEC into the meter can and is not designed for any type of connector.
Don
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This begs for the question: Does it matter where the bonding occurs in the enclosure, such as at the point of entry or at a bus located inches away?

When thinking of this question, if bonding location is not important, then why are we required to bond at both ends of the enclosure?
 
Pierre,
Does it matter where the bonding occurs in the enclosure, such as at the point of entry or at a bus located inches away?
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As long as the enclosure is metallic, the point of bonding between the GEC and the enclosure does not matter. If the GEC terminates on a bus, the bus would have to be bonded to the enclosure by a conductor with a an area equal to or greater than the area of the GEC. Bonding at both ends is only required when the enclosure is not electrically continuous. If you have a metal enclosure with a GEC passing through and the GEC is protected by a ferrous raceway, you could use standard locknuts on both of the raceways and a single bond to the enclosure and be in compliance with the rule in 250.64(E).
When thinking of this question, if bonding location is not important, then why are we required to bond at both ends of the enclosure?
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The bonding requirement for a ferrous raceway is to make it electrically continuous. In the case of a raceway originating at a metallic enclousre, the GEC is bonded to the enclosure and to the other end of the raceway. There no code section that specifies the type of bonding that is required at the raceway to enclosure termination point. The section only refers to the Chapter 3 requirements, so standard locknuts would be permitted. If you are installing the GEC through a hole in the enclosure and the GEC is bonded to the enclosure, there is no addtional bonding requried.
Don
 
don_resqcapt19 said:
Pierre,

As long as the enclosure is metallic, the point of bonding between the GEC and the enclosure does not matter. If the GEC terminates on a bus, the bus would have to be bonded to the enclosure by a conductor with a an area equal to or greater than the area of the GEC. Bonding at both ends is only required when the enclosure is not electrically continuous. If you have a metal enclosure with a GEC passing through and the GEC is protected by a ferrous raceway, you could use standard locknuts on both of the raceways and a single bond to the enclosure and be in compliance with the rule in 250.64(E).


Don
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Would the green screw provided by the manufacturer be considered adequate?
 
Pierre,
Would the green screw provided by the manufacturer be considered adequate?
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The green screw is the main bonding jumper for the service and is all that would be required.
Don
 
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