ring circuit test

[waitees]

Hi all

just wanted to confirm as got the nic man and anything that comes up, want to be confident in the answer.

Am i right saying that the r1 & r2 reading on a reading circuit should be ruffly the quarter of the end to end readings added up ie

L2L=0.26
N2N=0.26
L2L=0.43

TOTAL = 0.95

THE R1 & r2 value should be ruffly a quarter of that total.

also another quick question on the cert it says refernce method i have looked at the bs7671 bit confused, which one is mostly used in a domestic property ?

any ideas ??

 

[m4tty]

Hi all

just wanted to confirm as got the nic man and anything that comes up, want to be confident in the answer.

Am i right saying that the r1 & r2 reading on a reading circuit should be ruffly the quarter of the end to end readings added up ie

L2L=0.26
N2N=0.26
L2L=0.43 earth 2 earth?

TOTAL = l2l + e2e devided by 4 is your r1 plus r2 at each socket

THE R1 & r2 value should be ruffly a quarter of that total.

also another quick question on the cert it says refernce method i have looked at the bs7671 bit confused, which one is mostly used in a domestic property ?
Mostly clipped direct mate
any ideas ??[/QUOTE

 

[waitees]

what code do you normally put in that box ? for ref method ?

 

[chris gray]

no you only add R1+R2
L-L and E-E
you dont include the neutral result

 

[confused-fuse]

it should tell you in the osg or brb .... or the bottom of the form pvc clipped 1 pvc/loose 2 ect ect

 

[confused-fuse]

appendix 4 of bs7671 table 4a1

 

[m25maintenance]

ref method means how is the cable installed, ex ref c is clipped direct to wall not touching any insulation. ring test. end to end all 3 conductors, results are little r1 little r n and little r 2. just do more study

 

[ezzzekiel]

measure end to end of both cables
l - l =r1
n - n = rn
e - e =r2
cross connect l - n
(add together readings r1 + r2 and divide by 4)
this reading should be seen around ring and will become R1+R2