Cpc connection wylex

[Nigel sparks]

Hello can anyone advise what they would do in this situation please. I have a wylex 100amp switch fuse that has an incoming and out going cpc connection which takes up to a 16 mm cpc. I have 16mm incoming and outgoing cpc, however how do I then earth the enclosure and the banjo as the cpc connection has no connection with the enclosure

 

[IAmSparkytus!]

I'm assuming you're working with a 3core or 5core swa and you're using 1 core as the earth?

 

[westward10]

Is it one of those where there are the earth terminals at the main switch isolated from the earth terminal on the back box.

 

[Nigel sparks]

I'm assuming you're working with a 3core or 5core swa and you're using 1 core as the earth?

Hi Toon yes a 3 core and one core as earth

 

[Nigel sparks]

Is it one of those where there are the earth terminals at the main switch isolated from the earth terminal on the back box.

Yes it isolated from enclosure

 

[snowhead]

Similar to this one?

 

[westward10]

Similar to this one?

Exactly like that. Take the supply cpc to the back box terminal first along with the banjo cpc then another up to the switch body earth terminal.

 

[Nigel sparks]

Similar to this one?

Yes exactly that one

 

[Nigel sparks]

Exactly like that. Take the supply cpc to the back box terminal first along with the banjo cpc then another up to the switch body earth terminal.

T e back box terminal is very small probably only 6 mm max

 

[Nigel sparks]

Exactly like that. Take the supply cpc to the back box terminal first along with the banjo cpc then another up to the switch body earth terminal.

Why don’t they just put in an earth block big enough

 

[Nigel sparks]

Hello can anyone advise what they would do in this situation please. I have a wylex 100amp switch fuse that has an incoming and out going cpc connection which takes up to a 16 mm cpc. I have 16mm incoming and outgoing cpc, however how do I then earth the enclosure and the banjo as the cpc connection has no connection with the enclosure

 

[pc1966]

T e back box terminal is very small probably only 6 mm max

I noticed that in pictures of it. I really wonder why they have the switch CPC terminal at all, why not have just the box adequately sized?

 

[westward10]

It is a stupid design, being 100A I would have thought that terminal would take 16.0 have you tried it.

 

[pc1966]

Similar to this one?

Oh FFS why different Allen screw sizes!

 

[westward10]

Is it swa in and out or tails in.

 

[westward10]

Most of the spec online state that separate terminal will take a 16.0.

 

[Nigel sparks]

I noticed that in pictures of it. I really wonder why they have the switch CPC terminal at all, why not have just the box adequately sized?

Yes exactly, I wonder how many people have installed one thinking the enclosure is linked to it

 

[Nigel sparks]

Most of the spec online state that separate terminal will take a 16.0.

No that’s the earth terminal joined to the switch , the three connection are L N E

 

[Nigel sparks]

Is it swa in and out or tails in.

Tails in swa out

 

[pc1966]

Tails in swa out

Could you just take the 16mm CPC to a crimp lug bolted to the SWA's banjo and, assuming 3C SWA, also put a lug on the cable's SWA conductor to the same bolt?

i.e. Ignore the switch's through-CPC connection and the box's terminal strip completely.

EDIT: Also you could use a nylock nut if concerned about it coming loose.

 

[westward10]

Tails in swa out

Stick another 10.0 in for the terminal if it fits.

 

[Nigel sparks]

Could you just take the 16mm CPC to a crimp lug bolted to the SWA's banjo and, assuming 3C SWA, also put a lug on the cable's SWA conductor to the same bolt?

i.e. Ignore the switch's through-CPC connection and the box's terminal strip completely.

EDIT: Also you could use a nylock nut if concerned about it coming loose.

Yes I think that is the only option, it’s a lot of extra faff and the switches are not cheap

 

[Nigel sparks]

Stick another 10.0 in for the terminal if it fits.

No only takes a 10 mm

 

[Nigel sparks]

No only takes a 10 mm

Sorry I ment only takes a 16mm

 

[pc1966]

Yes I think that is the only option, it’s a lot of extra faff and the switches are not cheap

Could you knock the existing small terminal block off the box and fix something like this in its place with a pair of machine screws:

https://www.NoLinkingToThis/p/ced-4-way-earth-block/12386

You might need to have nuts on top and use countersunk heads coming through from the back to is fixes flush though.

 

[Nigel sparks]

Sorry I ment only takes a 16mm

What size cpc should I earth banjo with?

 

[pc1966]

What size cpc should I earth banjo with?

Depends on the fuse I guess. The On-Site Guide table B4 & B5 has smallest CPCs meeting adiabatic limit for fuse and Zs cases.

 

[westward10]

Sorry I ment only takes a 16mm

So this separate terminal will take a 16.0?

 

[Nigel sparks]

Could you knock the existing small terminal block off the box and fix something like this in its place with a pair of machine screws:

https://www.NoLinkingToThis/p/ced-4-way-earth-block/12386

You might need to have nuts on top and use countersunk heads coming through from the back to is fixes flush though.

That’s a good option it’s a shame I have fifteen to do of these

 

[Nigel sparks]

Depends on the fuse I guess. The On-Site Guide table B5 has smallest CPCs meeting adiabatic limit for fuse and Zs cases.

It will be a 80amp hrs, have seperate cpc so not relying on the armoured

So this separate terminal will take a 16.0?

Sorry no on the switch L and N will take up to 35mm and earth takes 16mm max

What size cpc should I earth banjo with?