CaTV | Grounding and Bonding

 

Metal objects have a tendency to accumulate a charge. If the charges between metal objects are different then an arc or spark could develop. This is called potential difference.

If there is no potential difference then there is no current flow and there is no danger of spark.

Bonding is a way to fuse together metal parts so there is no potential difference, and usually accomplished with a conductor.

The earth has an infinite ability to absorb electrons; so bonded parts are directed to a ground rod at the service entrance. This is called the grounding electrode (GE) which is usually a rod driven into the ground about eight feet. There are also other ways to do this. A GE is driven into the ground where the electric service (think electric meter) enters the home.

Grounding is the act of connecting bonded parts to a grounding electrode.

Grounding and bonding are important for cable TV (CATV) systems to protect people and equipment from lightning strikes and accidental power line contact. Grounding connects a circuit to the earth or another conductor that's connected to the earth, while bonding is the electrical connection of exposed metal items that aren't designed to carry electricity.

Grounding
Grounding a cable system to the same ground as the utility minimizes voltage between the cable and other grounded items in the house. A ground block can be used to ground the coaxial cable, and should be placed as close as possible to where the cable enters the building.

Bonding
Bonding can be done using existing utilities like meter boxes or water pipes. The shield of the coaxial cable should be bonded or grounded.

Standards
The National Electrical Safety Code (NESC) is the primary source of standards for grounding and bonding for CATV. The ANSI/EIA/TIA-607 standard also defines a telecommunications grounding and bonding system.

Unacceptable bonding locations
Some unacceptable bonding locations include natural gas piping systems, telephone ground rods, and sharing the power company's grounding clamp.

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