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Safe electrical isolation check before servicing boiler
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<blockquote data-quote="Andy™" data-source="post: 422538" data-attributes="member: 2012"><p>you need to use a proper voltage tester (like i said in post 14) between L&amp;N, L&amp;E, N&amp;E. many decent ones will also warn you if something is live (but not what voltage) with only 1 probe touching</p><p></p><p>for safe isolation, you have no need to test polarity. this only needs done if any modifications / work has been done / periodic inspection of the fixed wiring. by impedance check, if you mean earth loop impedance, then it is done with an earth loop impedance tester by connecting probes to L, N &amp; E (or in some cases, L&amp;E only). but as polarity, you have no need to do this for boiler maintenance. there are also a few different earthing systems which will give different results. a reading may be acceptable on one type but unacceptable on another. we often go to properties where the 'gas engineer' has 'failed' the wiring when there isnt actually anything wrong, he is just incompetent at electrics</p><p></p><p>you really need to learn a lot more about this before working on anything electrical</p><p></p><p>and if there is anything written down saying you test for dead the way you are, any chance of a copy / picture of it? stuff like that is always entertaining for us</p></blockquote><p></p>
[QUOTE="Andy™, post: 422538, member: 2012"] you need to use a proper voltage tester (like i said in post 14) between L&N, L&E, N&E. many decent ones will also warn you if something is live (but not what voltage) with only 1 probe touching for safe isolation, you have no need to test polarity. this only needs done if any modifications / work has been done / periodic inspection of the fixed wiring. by impedance check, if you mean earth loop impedance, then it is done with an earth loop impedance tester by connecting probes to L, N & E (or in some cases, L&E only). but as polarity, you have no need to do this for boiler maintenance. there are also a few different earthing systems which will give different results. a reading may be acceptable on one type but unacceptable on another. we often go to properties where the 'gas engineer' has 'failed' the wiring when there isnt actually anything wrong, he is just incompetent at electrics you really need to learn a lot more about this before working on anything electrical and if there is anything written down saying you test for dead the way you are, any chance of a copy / picture of it? stuff like that is always entertaining for us [/QUOTE]
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