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Discuss Mapping existing ring main in the DIY Electrical Forum area at ElectriciansForums.net

DB73

EF Member
Hi, I am a first time DIY poster - hoping to navigate the tricky line between getting a bit of a steer in the right direction and not requesting step by step instruction.

I am hoping to DIY the electrics on my extension, and in advance of the project I am trying to map the order of outlets on the existing ring mains. I am aware of the area of work R1 + R2 / 4 etc etc testing for faults and reckon this is DIYable (once a professional has repaced my old fuses with a CU, and added a big off switch just past the meter). My question is can anyone point me in the right direction for establishing in which order the outlets on the ring main run. I can think of a painstaking route of disconnecting two at a time so that anything else dead is then known to be inbetween the two, and if nothing else is dead then they must be adjacent, always keeping a look out for extra wiring suggesting a spur - am I on the right lines or is there a better method, perhaps with a multi-meter?

Incidently I am undertaking 20 days City and Guilds training in May (yes, am aware of the limitations and that this might make me an enhanced DIYer, but certainly not a sparks). I am super cautious on all isolaton matters - hence new isolation switch for whole house.

Sincere thanks to all the eperienced posters who are willing to share their expertise.
 

Murdoch

Electrician's Arms
If you are planning on doing your extension wiring, best you discuss this with your local building control if you want them to issue a completion certificate .....
 

Murdoch

Electrician's Arms

DB73

EF Member
Yes, but was on wrong forum earlier today, so have made my farewells there and moved this to DIY forum
 

Murdoch

Electrician's Arms
Yes, but was on wrong forum earlier today, so have made my farewells there and moved this to DIY forum
You won't get step by step guides in here either
 

DB73

EF Member
No, and that is a fair enough rule. I did not think that is what I am asking for - (I was hoping for a couple of sentences to point in the right direction)... but apologies if that is clearly what I am doing and I am sure I will get the hang of what is acceptable by keeping quiet and reading others' posts for a bit.
 

Cid

Regular EF Member
Well you are the King of your castle. Nothing wrong with wanting to find out out what lurks beneath the surface.

I would invest in a bosch wall scanner. Very handy in locating live cables in the wall. Lift floors if necessary. With a bit of common sense it's not that difficult to find out.
 

GMES

Hairy and proud
Staff member
Admin

telectrix

Scouser and Proud of It
Respected Member
@OP.a bit late, but.... you could ( if competent) , after isolation take readings R1+R2 from each socket. as you move from CU round rfc, readings will increase.
 

DB73

EF Member
Thanks for the replies - penny has dropped. Christ that was simple and am feeling a bit foolish now! I was focussed on R1 + R2 remaining constant as proof of connections, and forgetting the fact that one will increase and the other decrease, as you work your way around - this is what comes of reading, but not yet physically doing it. Will crack on now - thanks again.
 

farmer

EF Member
Hi, I am a first time DIY poster - hoping to navigate the tricky line between getting a bit of a steer in the right direction and not requesting step by step instruction.

I am hoping to DIY the electrics on my extension, and in advance of the project I am trying to map the order of outlets on the existing ring mains. I am aware of the area of work R1 + R2 / 4 etc etc testing for faults and reckon this is DIYable (once a professional has repaced my old fuses with a CU, and added a big off switch just past the meter). My question is can anyone point me in the right direction for establishing in which order the outlets on the ring main run. I can think of a painstaking route of disconnecting two at a time so that anything else dead is then known to be inbetween the two, and if nothing else is dead then they must be adjacent, always keeping a look out for extra wiring suggesting a spur - am I on the right lines or is there a better method, perhaps with a multi-meter?

Incidently I am undertaking 20 days City and Guilds training in May (yes, am aware of the limitations and that this might make me an enhanced DIYer, but certainly not a sparks). I am super cautious on all isolaton matters - hence new isolation switch for whole house.

Sincere thanks to all the eperienced posters who are willing to share their expertise.
Go way amd get an electrician
 

DefyG

Regular EF Member
@OP.a bit late, but.... you could ( if competent) , after isolation take readings R1+R2 from each socket. as you move from CU round rfc, readings will increase.
I thought it was a ring circuit!
R1+R2 should be the same wherever its is measured on the ring, not increase or decrease!
 

chris gray

Electrician's Arms
As a rfc the readings should remain constant. However if you link out l&e on one of the legs and make it into a radial, the readings will adjust according to circuit length
 

DefyG

Regular EF Member
Of course but didn't think we were supposed to give step by step instructions!
The OP doesn't really say why he needs to know?
 

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