Larry, The arrestor system is am aluminum braided loop around the top of the enclosure with lightning rods which connect to a copper braid running down each side of the brick enclosure through the slab to earth ground. It is tied to the conduit at two points prior to entering earth. I don't have an RFI meter but I can pick up the "hash" around the conduit and in the genral area of the meter with an AM radio. It is the same hash that can be detected next to the drive enclosures themselves. There has been no significant maintenance or changes to the system othe than the usual monthly cleaning and we haven't seen rain here in over a month. I have inspected the conduit which runs from the motors through liquid tight to IMC with threaded connectors to the diconnects through IMC back to the drives and can see no visual signs of failure. Since most drains are open at one end and grounded at chassis at the source would temporarily disconnecting the liquid tight from the IMC prove or disprove a loop anntenna theory?
