Marco,
This should be fairly straightforward. If the whole roof is truly grounded, you have nothing to worry about. If it is not well grounded, then you have cause for pause. I would recommend the new Megger MIT410 (or420 or 430) device. It has a 50V setting which is hugely beneficial for testing surge arrestors as well as PV arrays. I assume this does not have an obvious fault, or you would not have asked. If you can't find it with a dry megger, it is time to get out the garden sprayer with a mild soap solution and start spraying down the array methodically, one section at a time, while someone else operates the megger. With all that grounded metal, it should be easy to find. Ground is your friend when searching for ground faults. Bill. From: [email protected] [mailto:[email protected]] On Behalf Of Marco Mangelsdorf Sent: Tuesday, February 05, 2013 9:57 PM To: 'RE-wrenches' Subject: [RE-wrenches] finding array ground faults Hoo boy....I've got a tough one here. Trying to troubleshoot an array ground fault with a system that has 14 strings mounted on a metal roof with the whole roof and metal framed building being common to ground. Can anyone recommend any diagnostic tools out there to troubleshoot and locate ground faults? Thanks, marco
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