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Different Methods for Compliance with Intersystem Bonding Terminal NEC 250.94

jar546

jar546

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Here are two methods. One if preferred. One is an alternative. Your POCO may not allow the GEC to attach inside the meter can. I know that up north PPL does NOT allow it and down south, FPL does allow it. What is your preferred method? Does your POCO allow the GEC to be attached in the meter base?
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Two issues are:

The preferred installation states that a conduit that encloses the GEC shall stop 6” from the enclosure to expose the GEC. If the conduit is metal it shall be bonded at every end and that is not mentioned.

The alternate installation calls for tight bends in the GEC. Tight bends in the GEC are to be avoided.
 
jar546 said:
You would have passed both
Click to expand...
You are correct with the tight bends in the GEC but not more than a thousand times. Is there a code for the sharp bends or is it an informational note? Or perhaps it's Tiger Code. I do know that if a rupture is in the cards, that's where it will happen.

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The IBT.....never allowed this even once.

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That ground lug in the second picture is pretty bad in multiple ways.
 
Strip the GEC and don't worry about it....

Exception:
In existing buildings or structures, if any of the intersystem bonding and grounding electrode conductors required by 770.100(B)(2), 800.100(B)(2), 810.21(F)(2), and 820.100 exist, installation of an IBT shall not be required. An accessible means external to enclosures for connecting intersystem bonding and grounding electrode conductors shall be permitted at the service equipment and at the disconnecting means for any buildings or structures that are supplied by a feeder or branch circuit by at least one of the following means:

  • (1)
    Exposed nonflexible metal raceways
  • (2)
    An exposed grounding electrode conductor
  • (3)
    Approved means for the external connection of a copper or other corrosion-resistant bonding or grounding electrode conductor to the grounded raceway or equipment
 
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