ring main

[foghorn]

hi guys
yet another head scratcher i am doing a board change and have 3 cables for a ring main LIVE LIVE 0.45 N+N 0.45 CPC 0.68
other cable also reads on the end to end 0.12 0.15 and 0.23 cpc
any ideas as to what this could be expected that another circuit had been doubled up in fuse however all three cables seem to be part of same ring main.

 

[SYKRAPS]

Does the 3rd cable give you the stated readings between both cable 1 and 2?

 

[Octopus]

hi guys
yet another head scratcher i am doing a board change and have 3 cables for a ring main LIVE LIVE 0.45 N+N 0.45 CPC 0.68
other cable also reads on the end to end 0.12 0.15 and 0.23 cpc
any ideas as to what this could be expected that another circuit had been doubled up in fuse however all three cables seem to be part of same ring main.

Not enough info mate

 

[richy3333]

More info and do you mean a ring final circuit mate?

 

[foghorn]

yes mate ring final cicuit and 3rd cable gives me readings between both cable 1 and cable 2

 

[SYKRAPS]

yes mate ring final cicuit and 3rd cable gives me readings between both cable 1 and cable 2

Are they the same values from 3 to both 1 and 2?

 

[Octopus]

yes mate ring final cicuit and 3rd cable gives me readings between both cable 1 and cable 2

What are the readings between 1 & 2?

 

[Jimmy Boy]

You have an interconnection of some description, are all three pair of indentical appearance ? Sometimes you get a older or newer looking one, start as you would with a good ring, end to ends then do a figure of eight test on the sockets see if one pair give you equal readings, record the readings as you go or your get lost .
J

 

[foghorn]

i have 2 white cables twin and earth and 1 grey do u mean figure 8 with live and earth

 

[Guest55]

ah , the old 3 legged ring main , tis a rare bird.
:-D

 

[Jimmy Boy]

Look at the general board install, if most of the cables all look of a similar installation date, and one sticks out like a sore thumb...well...that's a starter for ten, there is only one figure of eight test for ring mains...it's in the OSG as well as GN3
J

 

[Jimmy Boy]

ah , the old 3 legged ring main , tis a rare bird.
:-D

I had a bird with three legs once..well I hope it was a leg..
J

 

[electric avenue]

Is the resistance between cables 1 and 2 (the higher resistance values of the ring final circuit) to the 3rd cable the same. it sounds like you have a ring then from one socket/spur and extra cable has been returned to the board.

 

[foghorn]

i thought there was 2 figure eights cross ver live and neutrals

 

[foghorn]

how far do u go though as i was only in to replace fuse box and what are we responsible for

 

[Jimmy Boy]

Whatever you sign for on the EIC
J

 

[Octopus]

how far do u go though as i was only in to replace fuse box and what are we responsible for

Would you leave it like that? How would you show this on your EIC?

 

[SYKRAPS]

how far do u go though as i was only in to replace fuse box and what are we responsible for

Anything you change the characteristics of and earthing

 

[Jimmy Boy]

If your doing a board change its your responsibility to do an EIC on all circuits you have energised
J

 

[CRAGS]

I have one of these coming up. CU change had a quick look at it the other day noticed on one of the RFC that there is 3 cables going into rewireable fuse hoping one of them is just extra sockets that have being added. Going back check it out before doing board change though

 

[foghorn]

was an emergency job as old fuse box blew up so had to change box network been out and disconnected main supply customer been without electric for three days

 

[SYKRAPS]

was an emergency job as old fuse box blew up so had to change box network been out and disconnected main supply customer been without electric for three days

If the CU blew up I would defo test everything to the enth degree

 

[Jimmy Boy]

I have one of these coming up. CU change had a quick look at it the other day noticed on one of the RFC that there is 3 cables going into rewireable fuse hoping one of them is just extra sockets that have being added. Going back check it out before doing board change though

Yes mate it is a well chewed bone on here for sure, division of circuits, but I would draw your attention to the BGB 314.1 to 314.4
J

 

[foghorn]

reason main board blew up was loose neutral in top of main switch

 

[foghorn]

BGB 314.1 to 314.4 ?

 

[Jimmy Boy]

BGB 314.1 to 314.4 ?

What ?j

 

[foghorn]

all test ok r1+r2 on lights ,cooker, shower,2nd ring good just the 3 cables on other ring a mystery

- - - Updated - - -

big green book lol

 

[foghorn]

not got it hear mate borrowed it got the brb though

 

[Jimmy Boy]

BRB ...is soooooo last year lol
J

- - - Updated - - -

Ring GF or FF ?
J

 

[richy3333]

not got it hear mate borrowed it got the brb though

? Ffs...