Electric cooker feed SWA external

[gazdkw82]

yes, and obviously the resistivity of copper/steel is different so using the armouring as cpc aswell as a copper conductor is not advisable

 

[telectrix]

yes, and obviously the resistivity of copper/steel is different so using the armouring as cpc aswell as a copper conductor is not advisable

nope.you can use both the armour and a core for cpc. only difference being that if you only earth the armour at the supply end, (to comply with earthing it), it won't be part of the cpc for the circuit.

 

[gazdkw82]

nope.you can use both the armour and a core for cpc. only difference being that if you only earth the armour at the supply end, (to comply with earthing it), it won't be part of the cpc for the circuit.

really? both connected together?

 

[Pete999]

really? both connected together?

Why not?

 

[telectrix]

yes, why not? they must be connected to earth the armour anyway. and as for building control. sod 'em on a minor job like this. never seen anyone prosecuted for failing to notify. it's only when someone gets hurt that the suits get off their shiny arses and make noises.

 

[gazdkw82]

it just doesn't seem right. I guess fault current will always just find the easiest path route to earth

 

[Bobster]

At the fault current you will be looking at, the armour and the internal CPC can most likely handle the fault current individually, so connecting them together is really no issue.

 

[Pete999]

At the fault current you will be looking at, the armour and the internal CPC can most likely handle the fault current individually, so connecting them together is really no issue.

Not got the idea yet? OP

 

[Ian1981]

Armour will be acceptable as a cpc in most cases

 

[gazdkw82]

I know armouring is ok as cpc on its own but I didn't know you could use both armouring and a core as a joint cpc

 

[Ian1981]

I know armouring is ok as cpc on its own but I didn't know you could use both armouring and a core as a joint cpc

As said already just bond the supply end then it won't act in parallel with the internal cpc if you don't want it to

 

[gazdkw82]

Well that's the plan Ian

Thanks everyone for the help.

As always, honest and reliable advice

 

[Risteard]

As said already just bond the supply end then it won't act in parallel with the internal cpc if you don't want it to

Earth rather than bond! No reason not to parallel them though.

 

[Ian1981]

Earth rather than bond! No reason not to parallel them though.

It's like being told of by the headmaster
It's the designers/installers choice whether he want to parallel them or not

 

[Bobster]

Question is, why wouldn't you parallel them up?

 

[telectrix]

Question is, why wouldn't you parallel them up?

only if you want to make the cooker TT.

 

[Ian1981]

Question is, why wouldn't you parallel them up?

It's not always an option in every case.
If you don't want to don't if the armour is not acting as the cpc.
If you want to do it , do it.