Cpc connection wylex

[Nigel sparks]

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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

 

[ToonSparky]

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:

CED 4-Way Earth Block

Order online at Screwfix.com. Nickel-plated. FREE next day delivery available, free collection in 5 minutes.

www.screwfix.com

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:

CED 4-Way Earth Block

Order online at Screwfix.com. Nickel-plated. FREE next day delivery available, free collection in 5 minutes.

www.screwfix.com

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?

 

[westward10]

If it takes10.0 then put a 10.0 into it along with the banjo cpc.

 

[Nigel sparks]

If it takes10.0 then put a 10.0 into it along with the banjo cpc.

No it take a 16mm only and my cpc is 16mm

 

[westward10]

No it take a 16mm only and my cpc is 16mm

This is totally confusing I assume from what you say the separate terminal does not take 16.0?

 

[Nigel sparks]

This is totally confusing I assume from what you say the separate terminal does not take 16.0?

The main earth terminal which is part of the main switch takes a 16mm cpc max, there is a small earth block which will take a 6mm max hope that explains

 

[westward10]

You will have to calculate as to whether fitting a 6.0 to it will satisfy.

 

[pc1966]

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

Could it be fixed physically with one of the box fixing screws, then a 6mm jumper to the box's terminals? Or maybe better just a 10mm jumper to lug on piranha / Earthing nut as quicker than banjo, etc?

 

[Nigel sparks]

Could it be fixed physically with one of the box fixing screws, then a 6mm jumper to the box's terminals? Or maybe better just a 10mm jumper to lug on piranha / Earthing nut as quicker than banjo, etc?

I will get over with unnecessary work as the switch fuse by wylex is very poorly designed

Could it be fixed physically with one of the box fixing screws, then a 6mm jumper to the box's terminals? Or maybe better just a 10mm jumper to lug on piranha / Earthing nut as quicker than banjo, etc?

i still think there are a lot of these installed where the installer thinks the cpc connection is common to the enclosure

 

[westward10]

It really is a terrible design putting in such a small separate terminal however Wylex may have calculated the worst scenario for fault protection and that a 6.0 would satisfy. I would email them.

 

[SparkySy]

They are rubbish considering the price of them, as usual the designer has never had to fit one or they would have noticed the massive cock up with the earth terminal!
The last one of those I fitted I ran the SWA cpc to the earth banjo bolt and lugged the 16mm outgoing on that as well. As stated above an earth nut would probably be quicker!
Sy

 

[Nigel sparks]

It really is a terrible design putting in such a small separate terminal however Wylex may have calculated the worst scenario for fault protection and that a 6.0 would satisfy. I would email them.

Yes but if it’s 100amp supply and both 16mm earth connections are used there is no where to get another earth bond from