ring circuit continuity test x- link results

[darren bergin]

hi
can anyone explain these results and possible fix on continuity tests of a ring circuit

x-link phase+neutral
skt 1 0.19 skt 2 0.15 skt 3 0.24 skt 4 0.21 skt 5 0.14

x- link phase + earth
skt 1 0.49 skt 2 0.31 skt 3 0.50 skt 4 0.61 skt 5 0.27

thanks

 

[Lectrician]

Makes little sense. Explain how you have done the test a little better.

 

[Spark123]

Is this a test question? Skt 1 spur? Interconnection incorrect?

 

[ricicle]

Are you testing on the socket terminals or via the plugtop/strip connector method.The latter will give false readings if the contact is poor between plugtop pin and socket, especially if the sockets are old.

 

[GaryMo]

Are you taking these readings through the socket face or directly at the terminals?

[EDIT] Too slow

 

[darren bergin]

i am a new to testing and testing my own house at moment
using a megger 1502/2
ring continuity is ok
but cross linking phase + neutral and phase + earth gives spurious results

I am using a "socket and see" plug-in connected to megger

thanks

 

[GaryMo]

Drop the socket faces and use test probes on the actual terminals then compare readings.

Assume cable is 2.5/1.5 T&E? If so, are the values for phase and neutral similar? Is the CPC roughly 1.67 times the value of the phase or neutral?

When cross connecting phase and neutral you should see a reading similar to that of the ring value of phase and neutral combined divided by four

(r1+rn)/4

When cross connecting phase and cpc you should see a reading similar to that of the ring value of phase and cpc combined divided by 4, this is known as R1+R2

R1+R2 = (r1+r2)/4

 

[Spark123]

The R1+R2 recorded on the schedule of test results is the highest measured result with the L-E cross connection in place, more than likely measured at a spur.

 

[GaryMo]

The R1+R2 recorded on the schedule of test results is the highest measured result with the L-E cross connection in place, more than likely measured at a spur.

True but I was talking about a standard ringmain where the value of R1+R2 should be the same at each point.
Obviously the figure would be higher at a spur.

 

[Spark123]

Yeah, I guessed that is what you were talking about though to clarify the situation that where sockets which are spurs exits, the recorded figure is as said.
In a ring final circuit where all sockets are part of the ring, all the resistances between L-E should be the same give or take a midges and be approximately a quarter of the r1+r2 at each point. The recorded R1+R2 is the maximum measured L-E resistance.
We have a proper ringmain at work too!!

 

[partpdoctor]

hi
sometimes if you get a bad reading you have to ram the plug in and out quick a couple of times, and flick the switch on and off a couple of times to improve the reading.
it may be due to dirt/ oxidisation on the plug/socket connection and switch contacts.
crude but effective as the tester voltage/ current is very low and is easily disturbed. it shouldnt really be an issue on new sockets though..
hope this helps you