Discuss Testing Ring Continuity short Question in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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just a quick question I want to clear up, basically when testing a ring circuit, why is it that the ohm values slightly increase per reading, and highest at the centre point?

and by how much does the resistance increase when a cable is connected, say with a terminal block. apposed to say a complete round circuit with no connects, if it as possible to make such a cable, (like the letter O, a complete band , hope u get my drift)

cheers
 
The reason the ohm value increases is because the cable length is longer which increases the resistance of the cable. And for your second question i havent got a clue.
 
the ohm value shouldnt increase at all, should it? If the readings taken at the interconnection then shouldn't it be the same at every other point? so confusing
 
Luke,

if the readings are increasing, then you are doing it wrong:rolleyes:

step one - end to ends of the phase (r1) neutral (rn) and cpc (r2)

if using 2.5/1.5 twin and earth then r2 is 1.66 times higher value than r1 and rn (because 2.5/1.5 = 1.66)

step 2 cross connect phase and neutral - incoming phase to outgoing neutral and outgoing phase to incoming neutral

measure between phase and neutral at each socket. value should be the same (+-0.05 ohms) with the value being r1+rn divided by 4. If you your valew is increasing then you have connected incoming to incoming, and outgoing to outgoing

step 3 - do same with phase and CPC, value will be r1 + r2 divided by 4, and will be your R1+R2 value for the circuit.

Both step 2 and step 3 readings will increase slightly on spurs.

any junctions boxes or connections that yopu add to the circuit will potentiall add resistance

sorry if i am egg sucking, but i appreciate that some people may be reading this and learning something!!!:eek::)
 
If they are going up and down around the ring, it normally means you've got the wrong legs crossed! (Most uncomfortable! ;))
 

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