December 22, 2017

Grounding and Bonding

Being in Florida I’m concerned about lightning. Someone at the club recommended the ARRL Grounding and Bonding book which I purchased and read. I followed the information in the book to create a single point ground panel outside the house using a DX Engineering utility box . Coax from the antenna comes into this box and into a lightning arrestor, then into the house where I have Delta switch which has another arrestor in it, then to the radio. I screwed an aluminum sheet to my shack table and then a copper pipe onto the back of the table with screws to attach equipment grounding terminals. The radio sits on the aluminum and is grounded to the copper pipe, which is then grounded to the Delta switch and then outside to the utility box. The utility box has a copper strap that connects to a ground rod right below it. Unfortunately my shack room is on the opposite side of the house from the house ground rod so I ran 50ft of #6 bare copper around to the house ground rod. I also grounded the antenna tripod using 10 AWG copper wire to another ground rod which also is bonded to the house ground on that side of the house. Connecting all the grounds together is the most important part. I read a story of a guy who grounded his coax to a ground rod but the not house ground and lightning ended up jumping from the radio across the room to his computer, then into the network switch and his networked devices causing a lot of damage.

 

I think I spent around $200 for all the copper and accessories, you might be able to do it a little cheaper without the utility box but probably not for the copper(unless your shack is near your house ground, #6 copper was around $1/ft). I used the minimum required gauge at each step for all the copper just to keep the costs down. Hopefully its enough. One storm has come through so far and had some thunder right above the house that sound like a bomb going off and everything was ok.

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