Please can you check this experts.

[Nickcrane]

Hi,

I took down a working ceiling rose in the bathroom and I am rewiring it wire for wire however it doesn't seem to make sense to me.

Old Choc Block
Left
1 None
2 Live
3 Neutal
4 Earth
Right
1 Two Lives
2 Neutral
3 Neutal
4 Earth[/img]

 

[Aragorn84]

When you say "live" and "neutral" do you actually mean "red/brown" and "Black/blue"?

If you do then it makes perfect sense, the switch drop likely comes from "1" and returns on 2, they've used a normal piece of twin and earth for the switch drop, so the returning live uses the black core.

That core should be flagged as live using red or brown insulation tape.

 

[EFLImpudence]

Just to point out for the future; whilst the chock-block, when held vertically, may have a left and right they are the same pieces of metal.
It doesn't matter which 'side' the wires are connected.

So, you actually have:
1 Two Lives - One supply, one to switch.
2 Two Switched Lives - One from switch, one to light.
3 Two Neutrals - One from light, one back to supply - this is what a neutral is, not the colour.
4 Two Earths. - One supply earth, one to switch.

 

[JohnW2]

So, you actually have:
1 Two Lives - One supply, one to switch.
2 Two Switched Lives - One from switch, one to light.
3 Two Neutrals - One from light, one back to supply - this is what a neutral is, not the colour.
4 Two Earths. - One from light, one to earth.

I suspect that (4) probably should read:

4 Two Earths. - One to earth (in supply cable), one to switch.

[We are only told of two 'earths' for the three cables, and I imagine that the 'missing' one probably relates to the cable/flex to the light/lampholder]

Do you agree?

Kind Regards, John

 

[PrenticeBoyofDerry]

A simple choc block arrangement with live/line, neutrals and CPC/earths looped-in. Note that the black cores are not always used as neutral conductors and are often configured as live/lines for the switching arrangement and ideally should be indicated at that location and at the switch/switches as this, this would normally be by sleeving the black core with a red PVC sleeve.

Untitled

• PrenticeBoyofDerry
• 22 May 2013
• 6

If you have colour cores of the new version of BS7671 wiring colours.
Then the red cores would be brown and the black cores would be blue.

So don't get fooled into automatically thinking blacks and blues are neutrals.
In fact don't get visually fooled be believing any core colour is that what you would expect it to be, inspection and testing would always be the prefered method to prove this.

 

[EFLImpudence]

Do you agree?

Oh yes, My mistake. I shall amend for future readers.

Thanks.