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Grounding versus Bonding



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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