Discuss 0.00 ohms r1+r2 on radial circuit? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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Newbie90

Hi all,

I've tested several radial circuits and only getting 0.00 ohms on the r+r2 test (zero'd leads)

2 of the radials only supplies one socket each and are approx. 3 metres in total length. (zs 0.25 and 0.21)
Another radial only supplies one socket and is appox. 5m in length. (zs 0.35)
The final radial supplies 2 sockets and approx. 7m in total length. (zs 0.53)

Are the readings due to the length of the run or could it be the batteries need changing on my Fluke Multifunction (even though no battery warning)

Thanks
 
3m of 2.5/1.5 will have a R1+R2 of 0.06. probably too low for your meter's resolution. try witout nulling the leads, then subtract the lead resistance from the measurement.
 
Thanks for the quick replies.

The Fluke Multifunction is auto ranging for the continuity tests and according to their website, on the 20 ohms scale for continuity testing it's resolution is 0.01 ohms.

So I would of thought it could read as little as 0.01 ohms.

I've heard they produce funny readings when they need new batteries but I've had no warning.
 
Just to prove your MFT how about fitting some replacement batteries, and see if that make any difference
 
and you've been a member long enough that you should know there's no such thing as r1+r2 on a radial . :6:
 
Or try your instrument on some lengths of spare cable and see what you get.
Compare your readings against the theoretical values in the back of the OSG.


Ha, missed that one Tel! :)
 
and you've been a member long enough that you should know there's no such thing as r1+r2 on a radial . :6:
Missed that one mate teach me to note the diff in r1+r2 and R1+R2 wont it?
 
Although technically its R1+R2 for your radial circuits. Whereas you record r1+r2 around your RFC with the highest value being classed as R1+R2. Is this a play on the capital 'R' telectrix?
 
Although technically its R1+R2 for your radial circuits. Whereas you record r1+r2 around your RFC with the highest value being classed as R1+R2. Is this a play on the capital 'R' telectrix?

Don't forget your divide by 4 now! :)
 

Reply to 0.00 ohms r1+r2 on radial circuit? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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