Discuss low IR N-E in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

S

sivoodoo

Hi all,

Just done a quick test on a ring for a friend, the results are as follows.
Continuity tests are all fine.

Insulation Resistance:
Line - Neutral = >299 MΩ
Line - CPC = >299 MΩ
Neutral - CPC 39.6 MΩ

Where should I begin in finding the problem with the N-E low IR.:confused:

Thank you.
 
Yes disconected at board.
Removed both legs of ring at board and tested L- E, L-N, N-E.

quick responses thank you guys.
 
Last edited by a moderator:
here are the continuity results:

r1 = 0.44
r2 = 1.35
rn = 0.55

(R1+R2) at all socket outlets were between 0.38 (min) to 0.46(max)


Thanks
 
you say its ok but r1 and rn have different readings its a ring so they should be the same r2 should be higher (assuming 2.5 t&e installation) due to higher resistance, code 3 im afraid further investigation required
 
yup just realised that r1 and rn are 0.1Ω difference and as far as I can remember isnt the maximum supposed to be a difference of only 0.05Ω
Yup further investigation required.

What could be a cause of this, a screw catching the neutral someplace?
 
could be mice chewing on cables for all i know (sorry but with out seeing it pretty hard from where im sat to say thats yours problem)
but what i would check first is all appliances un plugged, neons turned off, isolated all spurs (test later if needed) etc then re test. if that dont work split ring (think of it as two radials) and re test. in theory one radial will be faulty one will be ok. keep splitting 'faulty radial' till you find the 1. previously un noticed fuse spur with neon and dodgy connections! or 2. bad leg of cable that the mice have been eating!!!!!!
have fun!
 

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