Help With 2 Way Lighting Circuit Please

[Doc Hudson]

The CPC is connected to the earth terminal on the metal front plates.
Providing one of the screw fixings goes into a fixed lug on the back box, there is no need for a fly lead to bond the back box.

Whilst your statement is true Dave, looking closer at the picture do those back boxes actually have both the lugs mounted on a central pivot bar?

Doc H.

 

[steptoe]

Does the back box actually need earthed?

Its not extraneous, or exposed? And its deffo not accessible, the supply should be isolated before gaining access to it.

 

[Doc Hudson]

Just to be clear - All electrical work has to comply with 'Part P' and all other relevant parts of the 'Building Regulations' - what may not be required, in this instance, is 'notification' to 'Building Control'.

Part P only applies to certain types of installations in dwellings, communal parts of buildings serving dwellings, sources shared with dwellings etc.  It has no relevance to a lot of commercial, industrial, public sector buildings etc. Replacing accessories has no relevance to part P and wiring that is fixed to the surface of a wall and does not pass through any building structure has no relevance to the building regulations. Part P is only applicable in certain parts of the UK. So clearly all electrical work does not have to comply with Part P and certainly the OP's question on this thread is exempt from any need to consider Part P.

Doc H.

 

[ProDave]

Whilst your statement is true Dave, looking closer at the picture do those back boxes actually have both the lugs mounted on a central pivot bar?
Doc H.

Interesting point. Having looked closer, the lugs appear to be on some form of yoke, a design I've never seen before. I guess it depends how the yoke is fixed to the back of the box.

 

[kerching]

Well I reckon it's an MK 3840ZIC conversion bracket................but what do I know?????

I would posta link but my iPad hates me

 

[steptoe]

Does the DOC have a contract out on him?

 

[Steve3948]

Well I reckon it's an MK 3840ZIC conversion bracket................but what do I know????? I would posta link but my iPad hates me

Kerch, as you are old like me, you may have seen this switch box before, the box had a centre open rivet holding the fixing lug bar, you put a wood screw through the open rivet, I think it was appleby iirc.

 

[m4tty]

Ain't that them things in the wooden boxes used back in 1960's ?

 

[kerching]

Ain't that them things in the wooden boxes used back in 1960's ?

Still available. F handy if lugs are broken off, or you come across those metal back boxes that have no lugs......"mutac"I think they were called