Were looking at putting some gear (MT) up a 300 ft tower where the temps can hit -40 (with out the wind). As some of the equipment is not rated for these temps and we don't want to test them out either (tower climbing at that temp is a bitch), we are looking at a small heated enclosure. We can heat it at 48v and use the POE cable (any lower voltage and the current is to high for the wire pairs at those distances) or run some armored BX up the tower for 120vac. My concern is lighting or other discharges and frying the equipment at either end. What are the risks and would grounding the BX every 100ft (as per rules with coax) be enough to protect the equipment? Any feed back would be great.

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