To my knowledge they don't give these guides out lightly because they cover all the good lightning design and selection information (I haven't seen a CD version).
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I'm only familiar with the types used on RF transmission lines. There are two types, one has a replaceable element, the other is reusable. The only maintenance, I'm familiar with is to open the connections and verify they are not corroded. Follow manufactures instruction on the unit with a replaceable element.
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