Discuss Insulation Resistance - Live to Neutral short in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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Newbie90

Hi all,

Just a quickie. I carried out an insulation resistance test on a lighting circuit which only has two rooms consisting of 4 lights.

Live to earth and neutral to earth was fine but when I tested live to neutral I got a short circuit.

All the bulbs were removed so just wondering if anyone had any ideas?

The Zs reading was 0.73 ohms.

Thanks
 
If this was an existing circuit and it wasn't tripping or blowing fuses before you arrived then there's some kind of load still connected to it. Check the L-N resistance with a normal multimeter and try figure out what is connected and where.
 
Hi all,

Just a quickie. I carried out an insulation resistance test on a lighting circuit which only has two rooms consisting of 4 lights.

Live to earth and neutral to earth was fine but when I tested live to neutral I got a short circuit.

All the bulbs were removed so just wondering if anyone had any ideas?

The Zs reading was 0.73 ohms.

Thanks

Two possibilities-:

1.Something still connected which may or may not now be fried....(tv booster in loft....loft light)?
2. A fault.
 
There are no neons on the switches.

There is a tv amp in the attic, would that be spurred from lighting by any chance?
They often are, try unplugging it and retesting. If it clears then there's your problem, hopefully you won't have fried it. This is an example of why it's wise to do a test on 250v before the proper one at 500, they don't like it up em
 
For all it takes its wise to do a quick continuity test between L & N before applying 500V.

Edit. Or as Trev states IR test at 250V
 
Last edited:

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