fluke IR test on ring main

musicmaster050 · Mar 31, 2009

http://i598.photobucket.com/albums/tt69/musicmaster050/megger1.jpg
http://i598.photobucket.com/albums/tt69/musicmaster050/megger.jpghttp://www.electriciansforums.net/r...t.com/albums/tt69/musicmaster050/testr1r2.jpg

link to the readings and my meter in use is this correct thanx alot from mike

used the green croc clip on the neu and i put the red croc clip on the line side of the ring press the test button and all it stays on is 500 am nerw to testing and dont no if this is correct i need to be sure as i paid 300 quid from ebay for this meter and i dont want it if its broke

am taking it to a place in st helens tomorrow to have it looked at reguards mike

Spudnik · Mar 31, 2009

I dont use the fluke mike, but you would be better off just using one leg of the ring for testing.

If it stays on 500 then it maybe that the reading is over range meaning cables are good.

Best way to test meter is to clip the crocs together and press the button. It should give 0.

musicmaster050 · Mar 31, 2009

jason will that not damage the meter at 500v cheers from mike

DanBrown · Mar 31, 2009

Musicmaster..
You are testing correctly although i would have left the phase conductors in the breaker to make it a little easier.. Anyway, the reading on the fluke is correct as it says >500Mohms. This basically says the insulation of the cables is absolutly perfect. Any reading above 1Mohms is a pass although i would not be satisfied with a 1Mohm reading, and a lot of other electricians would agree there and would need a bit of investigation. For me i would expect a reading of at least 20Mohm...
Also, doing Insulation Resistance tests with the Fluke meter cannot damage itself at all, even if you short the leads with 500v test. Dont worry about the meter at all, Its a FLUKE!!!!......
Test results and Voltages
SELV / PELV = 250 V = Min 0.5 Mohms
Upto 500 V = 500 V = Min 1 Mohms
Hope this helps

musicmaster050 · Mar 31, 2009

dan you are a star cheers mate just 1 more thing how can i make a fault on the ring so when i megger it i can see the fault and also what results would i expect to see

thanx dan

Spudnik · Mar 31, 2009

musicmaster050 said:
how can i make a fault on the ring so when i megger it i can see the fault and also what results would i expect to see

thanx dan

As i said above, just short l-n behind the last socket with a link. (same as shorting the leads together),

That way the meter should show 0.

musicmaster050 · Mar 31, 2009

will give it ago 1st thing in the morning cheers

KNIPEX · Apr 1, 2009

you do know mate that your testing with the fused leads on though, they do pull off the probes if your wondering, makes it easier to get them into db.