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Visit http://www.mikeholt.com The antenna mast [810.15] and antenna discharge unit [810.20(C)] must be grounded as follows. Figure 810-21 01
Author’s Comment: Grounding the lead-in antenna cables and the mast helps prevent voltage surges caused by static discharge or nearby lightning strikes from reaching the center conductor of the lead-in coaxial cable. Because the satellite dish sits outdoors, wind creates a static charge on the antenna as well as on the cable attached to it. This charge can build up on both the antenna and the cable until it jumps across an air space, often passing through the electronics inside the low noise block down converter feedhorn (LNBF) or receiver. Connecting the coaxial cable and dish to the building grounding electrode system (grounding) helps to dissipate this static charge.
Nothing can prevent damage from a direct lightning strike, but grounding with proper surge protection can help reduce damage to the satellite dish and other equipment from nearby lightning strikes.
(A) Material. The bonding conductor or grounding electrode conductor to the electrode [810.21(F)] must be copper or other corrosion-resistant conductive material, stranded or solid.
(B) Insulation. Insulated, covered, or bare.
(C) Supports. The bonding conductor or grounding electrode conductor must be securely fastened in place.
(D) Mechanical Protection. The bonding conductor or grounding electrode conductor must be mechanically protected where subject to physical damage, and where installed in a metal raceway both ends of the raceway must be bonded to the bonding conductor or grounding electrode conductor. Figure 810-21D0 01
Author’s Comment: Installing the bonding conductor or grounding electrode conductor in PVC conduit is a better practice.
(E) Run in Straight Line. The bonding conductor or grounding electrode conductor must be run in as straight a line as practicable.
Author’s Comment: Lightning doesn’t like to travel around corners or through loops, which is why the bonding conductor or grounding elec-trode conductor must be run as straight as practicable.
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