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Lighning protection for external cams?

Ok so a customer just asked me about how best to protect his new external 2500series cameras and housings from lightning. Proper grounding of the 24VAC power and the enclosure but what about the cat5 cable? Do I really need to buy the 300.00 lightning arrestor for the ethernet drop?  The building has lightning rods all over it but they obviously have a problem in the area. I mean the cameras are less than 12" from the walls out there.

Probably do right?

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