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Disconnecting bonding with supplementary paths?
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<blockquote data-quote="phil d" data-source="post: 503836" data-attributes="member: 27126"><p>I had this once witha guy who was trying to trace a leakage current down to earth, he was adamant that putting his clamp around the main earth cable would reveal the answer, then I pointed out things like metal back boxes screwed to brick walls would allow some leakage to go to earth that way, the only way he'd get an accurate result measuring his way was if everything was on a plastic back box with no connections to any metal pipes and such like. It amazes me how many people don't know how to measure leakage current, I.E put the clamp around BOTH the live and neutral tails, if it reads zero fine, if it reads anything else then that is your leakage current. Then again I recently had a very amusing conversation with a young electrician, I asked him why he'd run a 10mm G/Y to both the gas and water pipes, 'because you have to bond them' he replied, so I asked him why and he replied that it was to prevent any dangerous voltage coming from outside into the building via the gas/water main.</p><p></p><p>I then asked how long plastic had been a conductor and he rather tersely informed me that it wasn't, it was actually an insulator! I had to laugh at his answer to my next question, having asked him how a voltage from outside could get inside via a plastic pipe, which, he assured me was non conductive I asked why then had he bonded the gas and water pipes. ' because we just do, it's an electrical thing, you wouldn't understand' he replied sounding rather annoyed and obviously not knowing I was in fact a spark myself. 'it's you who doesn't understand' I thought to myself as I walked away chuckling.</p></blockquote><p></p>
[QUOTE="phil d, post: 503836, member: 27126"] I had this once witha guy who was trying to trace a leakage current down to earth, he was adamant that putting his clamp around the main earth cable would reveal the answer, then I pointed out things like metal back boxes screwed to brick walls would allow some leakage to go to earth that way, the only way he'd get an accurate result measuring his way was if everything was on a plastic back box with no connections to any metal pipes and such like. It amazes me how many people don't know how to measure leakage current, I.E put the clamp around BOTH the live and neutral tails, if it reads zero fine, if it reads anything else then that is your leakage current. Then again I recently had a very amusing conversation with a young electrician, I asked him why he'd run a 10mm G/Y to both the gas and water pipes, 'because you have to bond them' he replied, so I asked him why and he replied that it was to prevent any dangerous voltage coming from outside into the building via the gas/water main. I then asked how long plastic had been a conductor and he rather tersely informed me that it wasn't, it was actually an insulator! I had to laugh at his answer to my next question, having asked him how a voltage from outside could get inside via a plastic pipe, which, he assured me was non conductive I asked why then had he bonded the gas and water pipes. ' because we just do, it's an electrical thing, you wouldn't understand' he replied sounding rather annoyed and obviously not knowing I was in fact a spark myself. 'it's you who doesn't understand' I thought to myself as I walked away chuckling. [/QUOTE]
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Disconnecting bonding with supplementary paths?
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