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Grounding Question (alien.top)

submitted 11 months ago by [email protected] to c/[email protected]

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I recently had a lighting strike and lost about $1000 worth of equipment. I'd like to reduce the chance of that happening again so I'm looking for advice.

I have a UDM in my house, with a 125 foot run underground in conduit to my barn. In the barn, I have a POE switch that feeds 10 cameras and an Ubiquiti AP. I'd like to add a ground somewhere. I just purchased a surge protector with ethernet for the barn, since the switch is currently plugged in directly to an outlet and should be protected anyway. I also bought this from APC for my equipment in the house. I was going to install that between my UDM and POE switch in the house, then ground it to an outlet.

I'm reading so much information about how to go about this. My barn is powered with 220v from my house, so 4 wires go to the barn H/H/N/G. the ground on the barn is the same ground as the house. If I use both devices can that create a ground loop in the event of a surge? I'm also reading that I can use the APC at any point on my network to provide protection. Is this correct?

Please don't suggest fiber runs, as the cable is already run and I don't plan on redoing it. Thank you all in advance.

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[–] [email protected] 1 points 11 months ago

A protector that fails is no effective protection. Even over 100 years ago, protector meant no damage from any surge - including direct lightning strikes. Effective protectors do not fail. Profit centers do.

After a lightning strike, does a telco replace 10,000 or 30,000 protectors on all those incoming wires? Of course not. They do not waste vast sums on puny (high profit) protectors.

Same applies to effective protection routinely implemented by informed homeowners. For about $1 per appliance. To protect from all surges including direct lightning strikes. But and again, only if that protector connects low impedance (ie less than 10 feet) to what is doing all protection. To the only item that harmlessly dissipates hundreds of thousands of joules.

Protector (if not promoted by swindlers) remains functional after many surges - including direct lightning strikes. With specification numbers that say so. Proven all over the world for over 100 years.