So i have a Fluke 369 A/C leak detection clamp meter that i have been using to check our shore cords at our marina. I have some issue that have left some electricians and myself puzzled...
-I clamp the whole shore cord and get 350 mA reading , ...theoretically meaning i have major current leakage issue..
-When i clamp the white and black wire from "inside " the pedestal, i get 0 mA, as i should, so no current leakage is going into the water?
-When clamping just the green ground wire i get that same 350mA reading. This is where we get stumped......what does this mean? where do we go from here?
-i have cut each breaker off on the boat one at the time until ALL breakers are off and still get same ground readings..including while main breakers off (boat is completely dead but still plugged to shore power...if unplugging boat from shore power cord, all readings are zero...naturally )
-probing some of the ground wires (green) on the boat buss bar gives same 350 mA readings... So SOMETHING has to be feeding in that ground wire somehow??
- no continuity readings when probing electrical outlet on boat to shore plug hook up
-was told this meter only reads "downstream" measurements by Fluke but electricians say differently
-all surrounding boats have minimal readings.
-according to Fluke (and electricians) this meter and test can only test leaking current by clamping hot and neutral wires only.....but they have an article on the fluke website stating different??? and that you CAN clamp all wires (hot, neutral and ground together)
Any help would be great, just want to be able to understand whats going on and if there is an issue, be able to point the finger at the right party.
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