Downlighters Earth Question

[chrisgc]

If manufacturers state 1mm2 then you must use it as the Regulations require you to comply with manufacturers' instructions. A cpc should also be terminated at every point.

Thats understandable BUT anyone know where I can get heat resistant 1.00mm 2-core flex cable (by the metre preferably)?

Chris

 

[Risteard]

Thats understandable BUT anyone know where I can get heat resistant 1.00mm 2-core flex cable (by the metre preferably)?

Chris

3-core surely?

 

[chocolate]

Isn't there a section in the regs that prohibits the termination of solid core conductors and stranded core conductors into the same terminal. So the solid core of 1.5 T&E and the stranded copper of a 0.75mm2 flex ( in the same terminal of the JB ) isn't permitted.

That's why the choc bloc is preferred - two T&E's in one end and the flex out the other. Each connection within the strip connector has two screws - this allows you to do this.

It also explains why, when installing RCBOs, the functional earth wire ( white ) isn't cut to reveal the stranded copper, as this results in the same problem at the earth bar of the CCU.

 

[chrisgc]

3-core surely?

If using 3-core where am I going to put the earth as there is only two terminals in the connector on the downlighter as its double insulated - so no earth needed.

Obviously my twin and earth will be goin into junction box then two core flex coming from junction too light connector.

With 3 core there does not appear to be anywhere I could put the earth?

Any help ??????

Chris

 

[chocolate]

3-core surely?

What would you do with the cpc at the light fitting end of the cable - if the terminal enclosure is only designed to take a 2-core ?

I would have thought 2-core flex also - as long as it is reasonably short enough between fitting and JB.

 

[chrisgc]

What would you do with the cpc at the light fitting end of the cable - if the terminal enclosure is only designed to take a 2-core ?

Thats exactly what I am trying to find out lol.

So just need to know what 2-core is goinf to be acceptable?

Someone help please lol

Chris

 

[flukey]

my supplier only does 0.75 and 1.5 2 core from stock so it would be 1.5 for me.

 

[chrisgc]

my supplier only does 0.75 and 1.5 2 core from stock so it would be 1.5 for me.

hey Flukey is that Heat Resistant?

Also guessing even though manufacter of lights says to only use 1.0mm using the 1.5mm would not be a problem would it?

Chris

 

[Risteard]

See 412.2.2.3.2

 

[flukey]

sure is

 

[chrisgc]

sure is

Thanks for that.

I seem to be finding it difficult to find 2-core heat resistant flex cable in either 1.0mm or 1.5mm.

Any suggestions, bearing in mind dont need a lot of it?

Chris

 

[flukey]

just realised the 1.5 is 3 core, would be a case of calling supplier as would be ordered in at mine

 

[jmtisme]

Clicks are the future I think they are v v good

 

[chrisgc]

Thanks for that.

I seem to be finding it difficult to find 2-core heat resistant flex cable in either 1.0mm or 1.5mm.

Any suggestions, bearing in mind dont need a lot of it?

Chris

Just bumping this question again

 

[cbw]

As suggested, I use clicks

You must take an earth to the light and just over sleave it or into a terminal block, this is so in the future if class 1 used the earth is there.

Supplier is assuming loop in at d/l which is why they say 1.0mm2, therefor 0.75 flex is fine, you are only running 1 d/l per flex.

So to sumarise,

10a MCB
earth to every D/L, terminate in conector
1.5mm2 t+E to a click connector for every D/L
0.75 3core flex from click conector to each D/L

 

[chocolate]

A 10A mcb seems a little excessive for this lighting circut. KLIX are a good thought, but you still have the problem of where the cpc is terminated in the fitting - or ecen if it is on a connector block, is there space inside the enclosure of the fitting ?

You would get away with a two core from JB to light fitting - as long as it isn't to long, but more importantly, the JB pops out the ceiling as easily as the light fitting so you can access all connections.

 

[ldworks]

Realise this is off the original question but could some one answer if ur testing a light circuit and they happen to be all GU10 type lights wat sort of test r u meant to do as the actual fitting wont hav an earth unless fitting has metal holder????is it just meant to have a n IR test?

 

[Amp David]

Realise this is off the original question but could some one answer if ur testing a light circuit and they happen to be all GU10 type lights wat sort of test r u meant to do as the actual fitting wont hav an earth unless fitting has metal holder????is it just meant to have a n IR test?

Take the readings at the termination where the earth is.

 

[Amp David]

Take the 1 or 2 ends of this (depending if its loop in loop out)

,
then connect them into some of these

,
which I ususally house in one of these

,
then from your Wago connectors take a short length of this

and terminate it to the downlighter, sometimes, dependant of the downlighter, I may use some of these

 

[ldworks]

hi thanks for the info all.