S
Ste69
I know you take the highest reading, though not sure if you take the highest reading on the ring circuit or a spur off the ring circuit?
cheers
cheers
Discuss R1+R2 of a ring circuit in the UK Electrical Forum area at ElectriciansForums.net
OKexcellent, cheers!
just to clarify
For when comparing r1+r2/4 to R1+R2, do i use the ring highest value or the spur highest value?
OK
the calculation of r1+r2/4 to give you (R1 R2) around the grounds so to speak does not take into account spurs....think about what r1, r2 & rn is.....:
end to ends...yes?
the value of (R1 R2) should be r1+r2/4.....we know that...yes?
the value off all points on the ring should be a Max. of 0.05 of each other....a spur will manefest itself by being considerably higher....thats how you will/should know its a spur.
its the highest value you would be putting down as the (R1 R2) of the circuit....this would be likely to be a spur...should there be any....
as long as all the points actually on the ring were stable..(to within 0.05 of ohm)..then yes...Thanks a lot mate!
Sorry. one more question.
so if the reading of r1+r2/4 is not the same as R1+R2, is that ok because we are using the spur reading for R1+R2?
say on the ring you have r1 0.33 r2 0.56 rn 0.33............on the ring all readings are 0.25 but on the spur its 0.36....soooo the R1+R2 is 0.36. If you use r1+r2/4= 0.23. so it is off by 0.13 but with the 0.25 reading its ok.
are these readings good then?
really sorry, just want to get my head around this.
not quite....lolContinuity of the line conductor proving correct polarity
yep...well doneOk end to end first check it's a ring
no.r1 and r2 /4 added to Ze to check if ZS complies
no...Yes in the second part of test these values should be half of the values in the first part
as long as all the points actually on the ring were stable..(to within 0.05 of ohm)..then yes...
let us not forget that your looking for a suitably low reading of (R1 R2)....as long as it concurs with the r1+r2/4 equasion
the whole point of (R1 R2)..is to prove theres CPC available at every point on the ring
so Ste69...:
can you tell us please how many stages there is to ring final testing (low ohms)
end to end i.e L1 to L2, CPC1 to CPC2, N1 to N2 this is you r1,r2,rn, then calculate r1+r2/4 this should be the same as your R1+R2 readings.
Connect opposite ends of the cables i.e L1 to N2 and L2 to N1 (go to each socket outlet and test), then L1 to CPC2 and L2 to CPC1 (go to each socket and test again, as long as the readings are good and similar take the highest as your R1+R2.
while doing the above you can check polarity of the circuit
so 3 stages.
and if one of the outcomes is proving theres a CPC available at every point served....can you tell us another outcome?
That all the sockets are connected correctly in the ring by having similar low resistance readings? and also if there are any spurs.
answer here please:
your also confirming that there isn`t a "ring within a ring"
oh...and get used to putting R1 R2 in brackets...like this:
(R1 R2)...
tha`s more chance of plattin pis than gettin me to teach any of them DIY turnips owt..You're a wasted talent! After all that 'teaching' you must be a prime candidate for a senior mentor in the trainee and DIY forums
Reply to R1+R2 of a ring circuit in the UK Electrical Forum area at ElectriciansForums.net
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