Bonding CATV to an A/C disconnect

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Midcobrian

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Hello MH Experts

First off let me thank you for the opportunity to ask your NEC experts a question.

I can find multiple sources on the forum that refer to using an electrical enclosure as a possible bonding point for low voltage. Some broadband MSO's have used the air conditioning disconnect as a bonding point when no other means of bonding is present.

After the introduction of the ISBT as a required device, I am being told by other MSO's that the A/C disconnect enclosure is no longer permissible as a means of bonding when a ISBT is not present.

Within the scope of NEC 2014, is the air conditioning disconnect enclosure an acceptable bonding point if there is no ISBT or other means listed in 250.94 1-6?

Thank you
 
I can not find where connection to the HVAC disconnect was ever acceptable.
 
No, there is nothing in the 2014 NEC that would permit the A/C disconnecting means to be used to connect the bonding conductor for a CATV installation.

Here is what Article 820 states are permissible for connecting the CATV.

(B) Electrode. The bonding conductor or grounding electrode conductor shall be connected in accordance with820.100(B)(1), (B)(2), or (B)(3).
(1) In Buildings or Structures with an IntersystemBonding Termination. If the building or structure servedhas an intersystem bonding termination as required by250.94, the bonding conductor shall be connected to theintersystem bonding termination.Informational Note: See Part I of Article 100 for the definition of Intersystem Bonding Termination.
(2) In Buildings or Structures with Grounding Means.If the building or structure served has no intersystem bonding termination, the bonding conductor or grounding electrode conductor shall be connected to the nearest accessiblelocation on one of the following:
(1) The building or structure grounding electrode systemas covered in 250.50
(2) The grounded interior metal water piping system,within 1.5 m (5 ft) from its point of entrance to thebuilding, as covered in 250.52
(3) The power service accessible means external to enclosures as covered in 250.94
(4) The nonflexible metallic power service raceway
(5) The service equipment enclosure
(6) The grounding electrode conductor or the groundingelectrode conductor metal enclosure of the power service, or
(7) The grounding electrode conductor or the groundingelectrode of a building or structure disconnectingmeans that is connected to an electrode as covered in250.32
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Chris
 
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