What is a grounding block? (with photos)

Lightning causes frequent damage to satellite dishes.

A grounding block is an accessory designed to effectively ground coaxial cables from satellite dishes and outdoor antennas. This ground connection is an essential protective measure to prevent damage to satellite dishes and television sets caused by lightning strikes. A grounding block is typically made of brass and consists of one or more double coaxial fittings, ground wire connection points, and mounting terminals. The block is for combining the grounding elements of the antenna cable, antenna assembly, TV set and transfer cable into a single well-grounded unit. Dual coaxial fitting allows a second coaxial transfer cable to pass from the ground block to the TV without any signal loss.

Ground blocks are used to ground coaxial cables from satellite dishes.

Transient power surges caused by lightning cause hundreds of millions of dollars in property and equipment damage each year. Ensuring that the grounding circuits in a home are properly installed and functional can go a long way in preventing this type of damage. One piece of household equipment that is damaged by lightning more often than most is the satellite dish and/or TV system. Installing a grounding block on the antenna cable is one of the most effective ways to tie the antenna, cable and TV system to the ground circuit and prevent damage from lightning.

A ground block is basically a conductive transfer device mounted in the building near the coaxial cable entry that creates a ground connection for the satellite dish, cables and TV. . These devices are made of a conductive material, such as brass, and have one or more pairs of consecutive coaxial fittings built into them. A coaxial cable is grounded through its protective metal sheath that is held under the bolted outside of the plug. When the antenna cable is screwed into the coaxial socket of the grounding block, a good electrical connection is formed between the cable and the grounding block.

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The device is also equipped with several grounding terminals. The messenger or antenna ground cable is connected to one of these terminals. A suitable ground wire is then run from the other end of the ground wire to the nearest building ground point. This arrangement effectively creates a good electrical connection between the antenna, its coaxial cable, and the building’s ground system.

To complete the installation, a transfer cable is connected to the opposite side of the socket carrying the antenna cable and connected to the TV set. The ground block will also create a solid ground point for the transfer cable and TV antenna input. When connecting the coaxial cables, messenger cable, and ground link, it is good practice to form a drip loop on each one, which hangs down and deflects moisture away from the connections. Silicone grease can also be applied to the ground link and bare ends of messenger cables to prevent corrosion from compromising ground continuity.

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