Some technical help please.

[Damian Petsas]

Ive just completed my first Domestic Pir and come across some odd values for r1+r2 and for insulation resistance on a fair few of the circuits. I would really appreciate some guidance with this to put my mind at ease.

Ring final circuit values ranging between 0.73 -0.92 ohms and getting 0.32 M ohms for my insulation resistance for phase to neutral ???? or even what would seen dead 0.01M ohms. My main concern is that on most circuits when testing insulation resistance i was getting a odd reading for one test and then a passable one for the other??

Ally guidance and wise knowledge would be greatly appreciated.

Many thanks guys .

 

[trev]

Your IR suggests either a breakdown in the insulation or something still plugged in. The continuity readings don't mean anything really mate, how long is the circuit?

 

[trev]

My money is on something plugged in still.

 

[Damian Petsas]

thanks for getting back to me its about 20 m run in total with 8 points.

 

[trev]

Or a neon on the circuit

 

[Dizzy_Maskell]

Sound like you could have a few issues,
1- did you remove all items from sockets and lamps etc
2 - It is actually an EICR not PIR
3- what are your issues with R1 R2

 

[trev]

Loose terminations on the continuity.

 

[trev]

Bolox, that'll teach me to read a post properly, I thought they were fluctuating end to end readings.

Eeyore.

 

[Damian Petsas]

I think i got everything disconnected could the neon on a faceplate cause it?? or lamps connected in a lighting circuit even if tested at 250v

 

[trev]

Both things could affect the reading even at 250, that's why you're taught to disconnect all loads.

 

[Damian Petsas]

ha ha yea i know "EICR" habbit to say pir!!! the end to ends were stable although my r2 value was really hight like 1.21 ohms???

 

[Damian Petsas]

so if i remove all lamps that should solve my issue over the ir on lighting circuit then?? i take it i gottal link out dimmers too( ball ache)

- - - Updated - - -

I know i mush come across useless but thought 250 v was to allow for testing such accessories without disconnection

 

[Damian Petsas]

typo before anyone gets in there "must" lol

 

[trev]

On an eicr you can test L+N together against CPC. You normally do a soft test @ 250 to check for remaining loads before the 500 test. They don't like it up em you know.

 

[Damian Petsas]

So do you suggest i retest ir if i got r1 and r2 values and a zs or should i just put it through as+200?? million dolllar q lmao

 

[Octopus]

Me thinks you need to swot up on GN3 and do some retesting.

 

[Geoffsd]

ha ha yea i know "EICR" habbit to say pir!!! the end to ends were stable although my r2 value was really hight like 1.21 ohms???

That's spot on for 2.5/1.5 with r1 of 0.73

 

[Damian Petsas]

clearly i need to do more testing and get my game face on.

 

[Damian Petsas]

i have mainly been doing commercial install works and v v little testing but gotta start somewhere i suppose. thanks for the headsup Geofsd so the values varying between 0.73-0.91 are ok?

 

[Geoffsd]

so the values varying between 0.73-0.91 are ok?

It's not tooooooo bad.

If you mean these are the results at different sockets being tested with a plug-in tester lead then I would suspect the socket contacts or the switches.

r1 of 0.73 and r2 of 1.21 is perfect for 2.5/1.5.