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Photos of an Intersystem Bonding Termination for TV and Telephone

 
Dear Mr. Electrician: How do I ground my telephone and cable TV demarcation terminal blocks? 

Answer: Your telephone and cable TV service each needs to be bonded to a ground rod or water pipe ground or both.  This is for lightning protection.  If Lightning were to strike the wire outside and your ground connections were in place, the lightning energy would be channeled directly to earth.  With a poor or non-existent ground connection, the lightning will find a way to ground, but that could be a path through your TV, computer, major appliance, even the metal air ducts or water pipes in your house.  That is how things get damaged or fires start.

Photos below are of a Intersystem Bonding Termination which is required by the National Electrical Code.  This simple terminal block makes it easy for telephone and cable TV installers to connect their wiring to a good ground connection.  For an alternative method of grounding and bonding the TV and telephone services that I did,
click here.
 
In the photo below, an Intersystem Bonding Termination is depicted.  It is nothing more than a terminal block approved for this purpose.  It takes one large grounding electrode conductor and up to four smaller grounding conductors for cable TV and telephone services.  It is important to have this for lightning protection.  The Intersystem Bonding Termination is required as per article 250.94 in the National Electrical Code.  You should also read NFPA 780 on lightning protection.
 
Photo of an intersystem bonding termination. Click for Next Photo
The copper wire above that passes through the Intersystem Bonding Termination is connected to two ground rods.
Close shot photo of an intersystem bonding termination
 

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Updated April 29, 2018

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