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Parallel earth paths
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<blockquote data-quote="derykmarl" data-source="post: 533539" data-attributes="member: 35566"><p>Bit of a PAT testing newbie question, having been enlisted to <em>in-service inspection and test all our electrical equipment </em>(*cough* "PAT test") everything with a 3 pin plug on it (maintenance does the non 3 pin plug stuff). </p><p></p><p>Found an object that is a new case to me: in our engineering department is a big old drill on a big metal stand. 3 pin plug, so I have to PAT test it. The PAT420 machine we use then grumbles that there's a parallel earth path. Turns out the whole thing is bolted right into the ground! Ground... ah.... parallel earth path. Right. I don't think they taught us this in the course, or if they did, it was just "yeah unplug the monitor from the PC before testing it".</p><p></p><p>What am I supposed to do? I can't find much in the guidance or the tester's manual other than to just be "aware" of it. Surely I don't have to try and unbolt it from the floor?</p><p></p><p>I also can't get a reading that passes without lead compensation yet, and can't find a spec embossed on the flex so am not sure how I'd calculate that.</p></blockquote><p></p>
[QUOTE="derykmarl, post: 533539, member: 35566"] Bit of a PAT testing newbie question, having been enlisted to [I]in-service inspection and test all our electrical equipment [/I](*cough* "PAT test") everything with a 3 pin plug on it (maintenance does the non 3 pin plug stuff). Found an object that is a new case to me: in our engineering department is a big old drill on a big metal stand. 3 pin plug, so I have to PAT test it. The PAT420 machine we use then grumbles that there's a parallel earth path. Turns out the whole thing is bolted right into the ground! Ground... ah.... parallel earth path. Right. I don't think they taught us this in the course, or if they did, it was just "yeah unplug the monitor from the PC before testing it". What am I supposed to do? I can't find much in the guidance or the tester's manual other than to just be "aware" of it. Surely I don't have to try and unbolt it from the floor? I also can't get a reading that passes without lead compensation yet, and can't find a spec embossed on the flex so am not sure how I'd calculate that. [/QUOTE]
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