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Do-It-Yourself (DIY) Question & Answer Forum
Generator Earth Testing
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<blockquote data-quote="davey345" data-source="post: 484391" data-attributes="member: 15045"><p>I realise i am going to regret this and look a little bit of an idiot, but if the gen star point is bonded to true earth, then that is a TNS ? it then has ONLY 2 50mm^"2 LINE and NEUTRAL conductors to the outbuilding, where the outbuilding is only bonded to ground via 4 earth electrode rods.</p><p></p><p>I have already taken off the two earth electrodes from the generator and using a 2 wire high current loop impedance test, tested between the 650V AC line and earth electrode</p><p></p><p>this gave me 14.3 ohms, i repeated this for the other electrode which gave me 14.1 ohms, so using resistors in parallel i got a resultant resistance of 7.1. how do i test a TN system then, G3 only shows TNS, TNS-c and TT, it give disconnection times for TN and TT, i am beginning to loose the will on this one, feeling very thick. </p></blockquote><p></p>
[QUOTE="davey345, post: 484391, member: 15045"] I realise i am going to regret this and look a little bit of an idiot, but if the gen star point is bonded to true earth, then that is a TNS ? it then has ONLY 2 50mm^"2 LINE and NEUTRAL conductors to the outbuilding, where the outbuilding is only bonded to ground via 4 earth electrode rods. I have already taken off the two earth electrodes from the generator and using a 2 wire high current loop impedance test, tested between the 650V AC line and earth electrode this gave me 14.3 ohms, i repeated this for the other electrode which gave me 14.1 ohms, so using resistors in parallel i got a resultant resistance of 7.1. how do i test a TN system then, G3 only shows TNS, TNS-c and TT, it give disconnection times for TN and TT, i am beginning to loose the will on this one, feeling very thick. [/QUOTE]
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