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Do-It-Yourself (DIY) Question & Answer Forum
Lighting Circuit Blowing........
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 28442" data-attributes="member: 250"><p>Your basic resistance ("continuity type") test is only testing using a low voltage.</p><p></p><p>an IR test sticks a higher voltage up the circuit which can identify breakdowns in cable that the resistance test wouldn't pick up.</p><p></p><p>But need to be aware of any dimmers or PIR etc.. on circuit.. IR can Zap them!</p><p></p><p>Do an IR with L&amp;N together to earth?</p><p></p><p>Symptoms sound like could be:-</p><p></p><p>1/ customer replaced a light fitting &amp; wired a switch back directly across L &amp; N!</p><p></p><p>Or 2/</p><p></p><p>maybe a metal fitting with a lamp holder that can twist round too much when replacing a bulb..</p><p></p><p>and as the bulb is removed / replaced wires twist out of back of connections?</p><p></p><p>so appears intermitant at times...</p><p></p><p> :| ?:|</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 28442, member: 250"] Your basic resistance ("continuity type") test is only testing using a low voltage. an IR test sticks a higher voltage up the circuit which can identify breakdowns in cable that the resistance test wouldn't pick up. But need to be aware of any dimmers or PIR etc.. on circuit.. IR can Zap them! Do an IR with L&N together to earth? Symptoms sound like could be:- 1/ customer replaced a light fitting & wired a switch back directly across L & N! Or 2/ maybe a metal fitting with a lamp holder that can twist round too much when replacing a bulb.. and as the bulb is removed / replaced wires twist out of back of connections? so appears intermitant at times... :| ?:| [/QUOTE]
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Lighting Circuit Blowing........
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