Discuss Switched Line dropping to 0v when tested in the Electrical Forum area at ElectriciansForums.net

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Good morning all. Got a bit of a problem that is stumping me.

Called to investigate an external light not working. This light is on the same circuit as about 5 other lights and is controlled via a photocell which switches in a contactor to bring all lights on. Every light is working apart from this one. This is an emergency light that has been given new batteries lamp and ballast. What happens is it will not work in mains.

When I put a tester on the SL it shows an AC voltage. My multimeter says 60v. When I put the testers probe to Neutral or Earth and test it correctly it drops to 0v.

Also seems when I only put one probe on(I know this isn't good practice) It will only register when I use the positive lead. Despite being AC..

Any ideas what could be causing this as every other light tests fine. The permanent live to charge the batteries tests fine at 230v to Neutral and Earth

Any info would be greatly appreciated :)
 
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