Testing circuit with low energy lights

[Harvey]

How would you test a circuit with fixed low energy light pendants for insulation resistance

L -N to E or 250v.

 

[SPECIAL LOCATION]

Exactly the same as any circuit with equipment vulnerable to testing.

But....

You knew that anyway didn't you...

I can tell from your initial suggestion...

If ever any doubt.. you can always check On-Site-Guide recomendation...

Which you will of course also be saying...

"Oh yes SL you mean I should read page 83"

10.3.3 Insulation Resistance

i Pre-test checks

b if circuit includes sensitive devices..... etc blah blah

2 a measurement should be made between the live conductors (Line & Neutral) connected together and the protective earth only.

and I would say..

yep spot on Harvey good of you to mention that cuz it always helps those learning the trade to have a reference to check back to!

:Salute

NOW

beer time!

GuinnessGuinnessGuinnessGuinness

 

[m4tty]

I always test at 250v first to make sure it's clear before putting 500v down it. May be unnecessary but don't wanna break anything sensitive. Cheers

 

[sparkytim]

Had an odd one today on a PIR, Could not disconnect an extension lead with Neon from a bedroom socket as a Water bed was tight up to it!

Tried a L+N to Earth at 250 Volts got >9.99 M ohms, so went for 500 Volt test and got 0.33 M ohms

Any one got any ideas?

 

[sellers]

Had an odd one today on a PIR, Could not disconnect an extension lead with Neon from a bedroom socket as a Water bed was tight up to it!Tried a L+N to Earth at 250 Volts got >9.99 M ohms, so went for 500 Volt test and got 0.33 M ohms

Any one got any ideas?

Did it have surge protection? Every time I've tested a property with surge protection extension leads they always show 0.3meg to earth!

 

[Ash]

Had an odd one today on a PIR, Could not disconnect an extension lead with Neon from a bedroom socket as a Water bed was tight up to it!Tried a L+N to Earth at 250 Volts got >9.99 M ohms, so went for 500 Volt test and got 0.33 M ohms

Any one got any ideas?

Cut the extension lead wire then rewire it after? That's what I did when I had one going to a socket behind a bookcase that would take a week to move

 

[SPECIAL LOCATION]

Did it have surge protection? Every time I've tested a property with surge protection extension leads they always show 0.3meg to earth!

Quite...

Capacitance in surge protection circuitry..

causing variation of continuity..

 

[Sidewinder]

Could be inductive parts in the filter which would offer back emf/increasing impedance to restrict rapid increases in a.c. voltage, aka surges, but offers little impedance to the d.c. chucked out by our testers?

Once above the 230/240 V threshold then perhaps there is a "zener" type device that kicks in?

Never studied them to be honest, always just bought filters spec'd by the filter maker, or spec'd them from our software when I used them a lot!