End to end testing on cpcs ring circuit.

[Deleted member 26818]

If you disconnect the RFC CPCs at the CU, you should not get any continuity between them and any other CPC or bonding conductor.
If you do get continuity, this would indicate a parallel path.

 

[rich.250]

When you say you are testing end to end on the rfc cpcs you are testing at the outlet on the seperate cpcs disconnected?? Not to the CU with an r2 lead??
Although it is un necessary to test your end to ends at the outlets.
When you done your R1 +R2 crossed over and R1+Rn crossed were they the same from the outlets??

 

[schoe]

If you disconnect the RFC CPCs at the CU, you should not get any continuity between them and any other CPC or bonding conductor.
If you do get continuity, this would indicate a parallel path.

sorry spinlondon for sounding stupid but how do you do this? when you disconnect them from the CU do you leave then loose or test between each end?

 

[schoe]

When you say you are testing end to end on the rfc cpcs you are testing at the outlet on the seperate cpcs disconnected?? Not to the CU with an r2 lead??
Although it is un necessary to test your end to ends at the outlets.
When you done your R1 +R2 crossed over and R1+Rn crossed were they the same from the outlets??

yeah cpcs are connected in the CU and they are disconnected behind the socket. r1+r2 = 0.67 r1+rn +0.52

 

[rich.250]

There does sound like a parralel path as spinlondon rightly said.
All the r1+r2 readings are equal within 0.05 at every outlet?

 

[rich.250]

Also just out off interest its looks high to meet the required disconnection time......???

 

[schoe]

There does sound like a parralel path as spinlondon rightly said.
All the r1+r2 readings are equal within 0.05 at every outlet?

yeah all the reading are equal within 0.05 other than a spurred socket which you would expect to be higher.

i didnt understand what spinlondon said though, do you no what an interconnection is?

 

[schoe]

Also just out off interest its looks high to meet the required disconnection time......???

the disconnection of zs? the max for a 32 mcb type b is 1.15 and my reading is 0.84

 

[rich.250]

40a is 1.15 and 32 is 1.44
i just thought Zs is high given your Ze and r1+r2
Zs=(r1+r2)+Ze

 

[schoe]

40a is 1.15 and 32 is 1.44
i just thought Zs is high given your Ze and r1+r2
Zs=(r1+r2)+Ze

but it is still well within the disconnection time required. any ideas on how to look for an interconnection?

 

[rich.250]

Disconnect the rfc cpcs from the cu and test from them to the MET this will tell you if there is a paralel path to earth on your circuit,
if you do then it may be a case of splitting the circuit at one outlet and testing each side and narrowing down the point of the parralel path.
without looking at it i cant really say what id do

 

[schoe]

Disconnect the rfc cpcs from the cu and test from them to the MET this will tell you if there is a paralel path to earth on your circuit,
if you do then it may be a case of splitting the circuit at one outlet and testing each side and narrowing down the point of the parralel path.
without looking at it i cant really say what id do

if it is a parrallel path it can only be from the aga which is connected to the ring circuit and the main bonding. are these parrallel paths a problem?

 

[ringer]

If there are two parallel paths (bonding to the aga and also to something else on the ring) then the cpc will effectively have an interconnection. You will therefore potentially have widely different readings at different points on the ring. Draw it out.

 

[1shortcircuit]

I have a Fluke manual that shows you step by step how to use your tester. I used to carry it in my tester box all the time just in case I couldn't remember teh exact procedure. PM me tomorrow and I will upload it for you, infact... I'll post it in a thread as I keep getting requests for it anyway:thumbsup

With everything unplugged and Fused Connection Units switched off...

Take the cpcs out of the consumer unit earth bar and test end to end what reading do you get?

After that reading, connect those two ends into a connector block (NOT CONSUMER UNIT EARTH BAR) and go to first socket and record reading, rejoin and go to next

Please take a note of all readings and post up here:thumbsup

Please be sure to be careful when using your tester, I'm all for learning but perhaps for the time being I wouls dtick to dead tests only... or at least until I have got this manual posted up

 

[schoe]

I have a Fluke manual that shows you step by step how to use your tester. I used to carry it in my tester box all the time just in case I couldn't remember teh exact procedure. PM me tomorrow and I will upload it for you, infact... I'll post it in a thread as I keep getting requests for it anyway:thumbsup

With everything unplugged and Fused Connection Units switched off...

Take the cpcs out of the consumer unit earth bar and test end to end what reading do you get?

After that reading, connect those two ends into a connector block (NOT CONSUMER UNIT EARTH BAR) and go to first socket and record reading, rejoin and go to next

Please take a note of all readings and post up here:thumbsup

Please be sure to be careful when using your tester, I'm all for learning but perhaps for the time being I wouls dtick to dead tests only... or at least until I have got this manual posted up

Thanks mate,

(Take the cpcs out of the consumer unit earth bar and test end to end what reading do you get?) i got 1.49 ohms and did throughout the circuit until the aga was connected then i started getting these varying reading unless i test from the consumer unit.

 

[Deleted member 26818]

I bet the Aga is spured of somewhere near the socket-outlet with the lowest reading?

 

[NMc]

Had to read this a couple of times as your testing methods do not appear logical

If the Aga is feed via the spur your earth will be connected to the metalwork on it and if this is gas feed through metal pipework then your gas bonding will be one of your parellal paths. The values around the ring will vary as you will have a longer part of the ring in circuit