Common Bonding...

[cableguy34]

I work for a cable company and we are having some problems with the whole Ground/Bond. I work in KY and from what I have learned is that in new constuction it is "Code" to have a #6 ground wire attatched to an 8' gound rod and we require before we hook them up that the power meter is brought up to "CODE". Dose anyone know where I can get this part of the code book?

 

[jxofaltrds]

Re: Common Bonding...

Cableguy

I am doing this from memory. I believe that at your end a # 10 is good enough. If you are taking about the cable "bond".

If you are concerned with the code, may I suggest that you buy the "whole" 2002 NEC. You will gain more that just cable knowledge.

Welcome.

Mike P.

 

[dereckbc]

Re: Common Bonding...

Cableguy. Refer to 820.40. You have some facts mixed up. The size depends on the application.

For example if the CATV is brought near the electric service, then a #14 AWG is the smallest conductor.

On the other had if you are driving a rod seperate of the AC service, you are required to bond the CATV electrode back to the service electrode with a # 6 AWG.

EDIT: Often CATV/Phone companies will drive a seperate ground rod for thier service without bonding to the AC service ground. This practice is forbiden by the NEC, and has fried a many TV's and VCR's, not to mention burned houses down and possible electrcuted people.

Read 820.40 for exact details.

[ July 29, 2003, 08:41 PM: Message edited by: dereckbc ]

 

[joe tedesco]

Re: Common Bonding...

Intersystem Bonding and Grounding Rules can be found here.

250.94 Bonding for Other Systems.

An accessible means external to enclosures for connecting intersystem bonding and grounding conductors shall be provided at the service equipment and at the disconnecting means for any additional buildings or structures by at least one of the following means:

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

FPN No. 1: A 6 AWG copper conductor with one end bonded to the grounded nonflexible metallic raceway or equipment and with 150 mm (6 in.) or more of the other end made accessible on the outside wall is an example of the approved means covered in 250.94(3).

FPN No. 2: See 800.40, 810.21, and 820.40 for bonding and grounding requirements for communications circuits, radio and television equipment, and CATV circuits.