TELECOM Digest OnLine - Sorted: Re: Electrical Grounding

Re: Electrical Grounding

Neal McLain (
Fri, 17 Nov 2006 02:51:44 -0500

Dan <> wrote:

> What is the effect of having an electrical ground
> close to a telecom (telephone land line) ground and
> what is the recommended distance they should be apart.

The "recommended distance they should be apart" is zero: both grounds
should be bonded together at a common ground point.

In the United States, the National Electrical Code specifies that ALL
electrical systems entering a building must be bonded together and
grounded to an approved grounding conductor at the point of entry.
This includes:

- Electrical power neutral conductor
- Exterior electrical circuits for lighting, water pumps, etc.
- Telephone lightning protector
- Telephone shield and/or messenger, if any
- Cable TV shield
- External antennas (amateur radio, radio, TV, DBS, etc.)

It also includes fire and police alarm wiring systems if any. It
might be a bit embarrassing if a fire alarm system started a fire.

There's an excellent article about all this at

Neal McLain

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