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I've been working in Birmingham for a couple of weeks and I am coming across a single neutral cable from the cu to each light point then the line is also a single cable with a earth to each switch then to the lights it must be from the 60s .It does seem to be the norm .

My problem is that other engineers are doing db changes and test cert a eic , in my eyes this is unsatisfactory the neutral has no earth so if it was cut it wouldn't trip the rcd and you would get a nice belt , any suggestions to my thoughts
 
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snowhead

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Mentor
And where would then current go after it flows through the person that cut the cable?

1. Nowhere
2. Back into the other side of the cut Neutral
3. To earth
 

Risteard

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Arms
Esteemed
There is no requirement for each cable to have a cpc. PVC/PVC singles are fine and common here.

Each point in the wiring will have a cpc at it.
 
  • Thread Starter Thread Starter
  • #6
Thanks for your advice I did look in the regs but couldn't see anything . You do have a good zs at lights but Your thoughts on rcd not tripping when the neutral being cut
 

Pete999

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Arms
Esteemed
I've been working in Birmingham for a couple of weeks and I am coming across a single neutral cable from the cu to each light point then the line is also a single cable with a earth to each switch then to the lights it must be from the 60s .It does seem to be the norm .

My problem is that other engineers are doing db changes and test cert a eic , in my eyes this is unsatisfactory the neutral has no earth so if it was cut it wouldn't trip the rcd and you would get a nice belt , any suggestions to my thoughts
So you have single insulated cables with PVC Mech protection, the red of these cables has a cpc no problem then is there? The earth is provided in the red core f the circuit, done loads of installs that way in the 60s it was the norm on house bashing installs.
Red plus cpc (live) to switches SL plus cpc as sl from light to switch, N black no cpc to all lights, 2 ways etc in twin and earth
 
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S

Silly Sausage

Hmmmm?
Seeing as a Neutral is classified as a 'Live' conductor ...
What if there is a break of infinite resistance in said Neutral between Load and Origin?
 

Pete999

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Arms
Esteemed
Hmmmm?
Seeing as a Neutral is classified as a 'Live' conductor ...
What if there is a break of infinite resistance in said Neutral between Load and Origin?
The circuit will still be earthed via the red plus cpc
 
D

Deleted member 9648

If a circuit was wired in singles in trunking or other containment a N could be cut with the same result, no issue.
 

Wilko

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Arms
Esteemed
If a new CU is being done (post #1) and EIC done, then there's no place to code C3 (post #2) (?) ... And then reading Reg 543.6.1 "the protective conductor shall be incorporated in the same wiring system as the live conductors or be in their immediate proximity". I wouldn't be happy that spiderweb of L, N, sL and E across a ceiling space fits this reg, perhaps am I wrong?
 

Pete999

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Arms
Esteemed
If a new CU is being done (post #1) and EIC done, then there's no place to code C3 (post #2) (?) ... And then reading Reg 543.6.1 "the protective conductor shall be incorporated in the same wiring system as the live conductors or be in their immediate proximity". I wouldn't be happy that spiderweb of L, N, sL and E across a ceiling space fits this reg, perhaps am I wrong?
It did in the 60s
 
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