Grounding vs Bonding Online Training

This article was posted 04/14/2006 and is most likely outdated.

Grounding vs Bonding: 250.94 Grounding (Bonding) of Communications Systems

April 14, 2006

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PART V. BONDING

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250.94 Grounding (Bonding) of Communications Systems.

An accessible bonding point must be provided at service equipment or the disconnecting means of separate buildings or structures for communications systems. The point can be any one of the following:

(1) An exposed, nonflexible metallic raceway.
(2) An exposed grounding electrode conductor.
(3) An external connection approved by the authority having jurisdiction.

FPN No. 2: Communications systems must be bonded together. Figure 250–134

• Antennas/Satellite Dishes, 810.21
• CATV, 820.100
• Telephone Circuits, 800.100

Author’s Comment: The bonding of all external communications systems to a single point minimizes the possibility of damage to the systems from potential (voltage) differences between the systems. Figure 250–135

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Figure 250–134
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Figure 250–135
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Comments

Communications system must be grounded in accordance with the NEC, and your suggested installation of grounding to an outlet box is not one of the methods permitted by the NEC. See 800.100.

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