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EF: Difference between 250v/500v insulation resistance and 15ma/200ma continuity test?

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EF: Difference between 250v/500v insulation resistance and 15ma/200ma continuity test?

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ppelec100

Difference between 250v/500v insulation resistance and 15ma/200ma continuity test?

Hi I hope everyone is all well.

I’ve built a rig at home on some ply to do some testing and fault finding to prepare for my exam and just learn in general…

I put 100v then 250v through L & N through a B22 led lamp and also the spur neon to see what reading I would get. They were both the same at 100v: 1.35Mohm and 250v: 0.195Mohm
I didn’t want to do it on 500v for obvious reasons.

Can someone enlighten me on the test voltages please. I know insulation resistance test is like a pressure test between conductors to check for breakage of insulation deterioration and short circuits.

Q1. Why is there different readings when you use different voltages? Also if you have any other info about insulation resistance testing that will be useful to me please tell.

I also noticed there is a button to switch from 15ma and 200ma on the continuity test. From my 2391 course these past couple weeks I know we test using 200ma.

Q2. What is the 15ma option for? Can someone go into the differences in a bit of detail please?

Thank you

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