Departurtes

[Spark123]

Nope, you can't use it for main protective bonding as that often needs to be 10mm depending on supply type and connected directly to the MET, you also wouldn't expect to find a MPEB conductor in the CPC rail designated for a circuit.
I don't think I mentioned MPEBs tho?
Of course, your MPEBs should be checked that they are adequate before any alterations or additions are carried out (reg 131.8)

You would need to run the 4mm from the consumer unit all the way to each class 1 accessory in turn keeping it close to the original cable run.

In other words, in 999/1000 instances it would be just as easy to replace the old cable with twin and earth instead of faffing about with 4mm.

 

[ban-all-sheds]

he (BAS) asked me a question to possibly "establish" my competancy, I have only responded to his request, - and "nothing" to your comment/quote.

No - it wasn't for that reason, although inadvertently it did reinforce the conclusion everybody has reached regarding your competency...

It was because of this exchange:

I know that the new CCU is compliant ),

No it's not.

The WYLEX CCU is fully compliant, all equipment that they supply has to be BS and CE approved, (and is/has been) ...you cannot dought that

I was trying to point out that even if everything you use complies with all the BS standards it should, and has all the CE approvals it should, it's still possible to use the items and materials in a way which does not comply with the Wiring Regulations.

I was trying to point out that even though your Wylex CU is "fully compliant" as a product, your proposed use of it is not compliant.

And you blathered on about 4D4A, installation methods, derating factors etc as if there might be a way in which a circuit cabled with 1.0mm² could be out on a D63 breaker....

 

[duncanhead]

Nope, you can't use it for main protective bonding as that often needs to be 10mm depending on supply type and connected directly to the MET, you also wouldn't expect to find a MPEB conductor in the CPC rail designated for a circuit.
I don't think I mentioned MPEBs tho?
Of course, your MPEBs should be checked that they are adequate before any alterations or additions (fundamental principle)

You would need to run the 4mm from the consumer unit all the way to each class 1 accessory in turn keeping it close to the original cable run.

In other words, in 999/1000 instances it would be just as easy to replace the old cable with twin and earth instead of faffing about with 4mm.

No u didn't mention MPEBs...

the main bonding is 16mm2 with gas and water at 10mm2 (each)
so are u saying that if I use 4mm2 unprotected cpcs then i'd need x 4 (for each fitting) ? as well as myself adding additional bonding in the loft to the water riser, so let's get this clear, bonding to all services (DNO, gas, water) at the CCU, additional bonding in the loft (to the (already bonded water riser)) and I'd need 4 times 4mm2 cpc - seems over done to me - if 1.5 mm2 t&e (with just a 1.0 mm2 cpc for all) is sufficient, doesn't add up, I can reason with 2 times over factor for mechanical/protection reasons - and I'm sure that "special" cables with the mechanical qualities of twin sheathed PVC exist for this purpose, or is that's how it is?!

 

[duncanhead]

he (BAS) asked me a question to possibly "establish" my competancy, I have only responded to his request, - and "nothing" to your comment/quote.

No - it wasn't for that reason, although inadvertently it did reinforce the conclusion everybody has reached regarding your competency...

It was because of this exchange:

I know that the new CCU is compliant ),

No it's not.

The WYLEX CCU is fully compliant, all equipment that they supply has to be BS and CE approved, (and is/has been) ...you cannot dought that

I was trying to point out that even if everything you use complies with all the BS standards it should, and has all the CE approvals it should, it's still possible to use the items and materials in a way which does not comply with the Wiring Regulations.

I was trying to point out that even though your Wylex CU is "fully compliant" as a product, your proposed use of it is not compliant.

And you blathered on about 4D4A, installation methods, derating factors etc as if there might be a way in which a circuit cabled with 1.0mm² could be out on a D63 breaker....

Ok, all points noted, in what way is my use not going to be compliant?

 

[duncanhead]

he (BAS) asked me a question to possibly "establish" my competancy, I have only responded to his request, - and "nothing" to your comment/quote.

No - it wasn't for that reason, although inadvertently it did reinforce the conclusion everybody has reached regarding your competency...

It was because of this exchange:

I know that the new CCU is compliant ),

No it's not.

The WYLEX CCU is fully compliant, all equipment that they supply has to be BS and CE approved, (and is/has been) ...you cannot dought that

I was trying to point out that even if everything you use complies with all the BS standards it should, and has all the CE approvals it should, it's still possible to use the items and materials in a way which does not comply with the Wiring Regulations.

I was trying to point out that even though your Wylex CU is "fully compliant" as a product, your proposed use of it is not compliant.

And you blathered on about 4D4A, installation methods, derating factors etc as if there might be a way in which a circuit cabled with 1.0mm² could be out on a D63 breaker....

Ok, all points noted, in what way is my use not going to be compliant?

- it's a constructive question...

 

[Spark123]

the main bonding is 16mm2 with gas and water at 10mm2 (each)

Main protective equipotential bonding is what links the water and gas etc to the MET. The earthing conductor is what links the means of earthing to the MET. A circuit protective conductor links the MET to the consumer unit.

so are u saying that if I use 4mm2 unprotected cpcs then i'd need x 4 (for each fitting) ?

No, just one run in looped to each accessory.

as well as myself adding additional bonding in the loft to the water riser, so let's get this clear, bonding to all services (DNO, gas, water) at the CCU, additional bonding in the loft (to the (already bonded water riser))

I don't follow where you are getting the idea of bonding to pipework in the loft from??

if 1.5 mm2 t&e (with just a 1.0 mm2 cpc for all) is sufficient, doesn't add up, I can reason with 2 times over factor for mechanical/protection reasons - and I'm sure that "special" cables with the mechanical qualities of twin sheathed PVC exist for this purpose, or is that's how it is?!

If you look at regulation 543.1.1 it specifies the minimum size of 4mm for non mechanically protected CPCs that are not an integral part of a cable, not formed by conduit, ducting or trunking, or not contained in an enclosure formed by a wiring system.
If it is part of a cable or another mentioned above the minimum size can be selected by using table 54.7 or by calculation using the adiabatic equation.

 

[holmslaw]

..

 

[duncanhead]

the main bonding is 16mm2 with gas and water at 10mm2 (each)

Main protective equipotential bonding is what links the water and gas etc to the MET. The earthing conductor is what links the means of earthing to the MET. A circuit protective conductor links the MET to the consumer unit.

so are u saying that if I use 4mm2 unprotected cpcs then i'd need x 4 (for each fitting) ?

No, just one run in looped to each accessory.

as well as myself adding additional bonding in the loft to the water riser, so let's get this clear, bonding to all services (DNO, gas, water) at the CCU, additional bonding in the loft (to the (already bonded water riser))

I don't follow where you are getting the idea of bonding to pipework in the loft from??

if 1.5 mm2 t&e (with just a 1.0 mm2 cpc for all) is sufficient, doesn't add up, I can reason with 2 times over factor for mechanical/protection reasons - and I'm sure that "special" cables with the mechanical qualities of twin sheathed PVC exist for this purpose, or is that's how it is?!

If you look at regulation 543.1.1 it specifies the minimum size of 4mm for non mechanically protected CPCs that are not an integral part of a cable, not formed by conduit, ducting or trunking, or not contained in an enclosure formed by a wiring system.
If it is part of a cable or another mentioned above the minimum size can be selected by using table 54.7 or by calculation using the adiabatic equation.

Ok, to clarify, the Main protective equipotential bonding is 2 times 10mm2. The earthing conductor is 16mm2 . the circuit protective conductor is also 16mm2.

http://www.browse.to.it/bonding.jpg

 

[ban-all-sheds]

Ok, all points noted, in what way is my use not going to be compliant?

131.8!!!

the circuit protective conductor is also 16mm2.

 

[duncanhead]

Ok, all points noted, in what way is my use not going to be compliant?

131.8!!!

the circuit protective conductor is also 16mm2.

as in the CU to earthing bar, also the earthing bar to the DNO supply feed - all 16mm2 see the pic...

http://www.browse.to.it/bonding.jpg

 

[Spark123]

Who installed the BS951 clamp to the DNO cable? Personally I'd have crimped the final connection to any pipe clamp or doubled it over.
Also you are missing the "Safety Electrical Connection, Do Not Remove" label from the MET.
Whats with the piddly little yellow wire connected to the MET too?

 

[flameport]

Who installed the BS951 clamp to the DNO cable?

The last person who worked here:
http://www.youtube.com/watch?v=WkDCS8xeobg

 

[duncanhead]

Who installed the BS951 clamp to the DNO cable? Personally I'd have crimped the final connection to any pipe clamp or doubled it over.
Also you are missing the "Safety Electrical Connection, Do Not Remove" label from the MET.
Whats with the piddly little yellow wire connected to the MET too?

OK - I'll double it over..

It's a wanda lead...

 

[Spark123]

Who installed it tho?

 

[duncanhead]

Who installed the BS951 clamp to the DNO cable?

The last person who worked here:
http://www.youtube.com/watch?v=WkDCS8xeobg[/QUOTE]

yes - this "****" does happen
I've synced 60 MWatts plants to the national grid... If you don't get it *right* then "problems" occur, and believe me if the sync and/or frequency is not exactly right *strange* sounds come from the "genni" hall.....