RFC testing shenanigans

[NDG Elecs]

So after Tony has made me recall the 1.5k ohms bit, which I am beyond stupid to forget! As said brain is frazzled! I am left pondering.

1500 ohms resistance on cont reading. So why am I getting open cct on other N-CPC reading, if the meter was accurate enough surely I would get 1500.21 ohms, if you follow my train of thought!!

 

[telectrix]

seems to me to be case of over thinking.

 

[Richard Burns]

If you have continuity on r1 r2 and rn then, whilst you may get a low insulation resistance between cores, it would not be possible to get different IR values from either ends of the cable.

The scale differences would obliterate any variance in IR readings based on tenths of an ohm.
1.5kohms on continuity could well show up as 0.0Mohm on IR.

The only thing, apart from operator error, that I can think of would be that the method of moving the cables to test them is causing a fault in one case and not in the other.