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Spliced Grounding Electrode Conductors


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The more info requested:

There are 4-conductors within this clamp.

Situation: The service panel was once mounted just above this in a weather-resistant wooden box on the exterior of the home. When they moved this panel inside, they needed to extend the 2-grounding electrode conductors (GECs) several feet to accommodate this move.

I plan to recommend that this be replaced with either a single crimped connector, a single irreversible compression connection, or with an exothermic weld - unless someone has a strong opinion that I should do other wise - such as both individual GECs should have its own proper splice.

Ken - thanks for photo.

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1/4" by 2" busbar mounted at an accessible location.

If you were to install this busbar, it would have to be in the location of that splice. Otherwise you are back to the irreversible compression type connector ( crimp) or exothermic welding. Also any irreversible compression type connector used MUST be listed for grounding and bonding.

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In reality what Jeff posted about using a copper buss bar legal.

Thats why I posted that the copper buss bar must be located at the location of those split bolts.

Definition of a Grounding Electrode Conductor according to article 100 of the NEC reads:

Grounding Electrode Conductor - A conducotr used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system

Article 250.50 Grounding electrode system tells us that all grounding electrode present at each building or structure shall be bonded together to form the grounding electrode system.

NO where in the NEC does it say that the grounding electrode conductor must be continuous to the PANEL.(It does say that it must be continuous in length, but does not say to where.)

Article 250.64 Grounding Electrode Conductor Installation

Article 250.64 © Part "C" of article 250.64 tells us that Grounding Electrode Conductor(s) shall be installed in one continuous length without a splice or joint except as provided in (1) and (2)

1- says you can use irreversible compression type connector listed for grounding and bonding or exothermic welding

2- says you can use sections of buss bar to form a grounding electrode conductor.

So Legally you can install a 1/4" x 2" copper buss bar and run all your grounding electrode conductors to it. For example lets say you have a structure that has ground rods, 10' of underground metal water pipe, and a concrete encased electrode ( uffer ground).

You can run a grounding electrode conductor from each of these to a copper buss bar then run one grounding electrode conductor to the panel. You have just created a grounding electrode system.

Those of you who have access to the NEC Handbook there is a nice explanation of this on page 222 of the 2008 edition. I will try and scan and post it later.

This is a common practice in industrial and commercial installations

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