cpc sheathing

[Jacobs]

hi guys....why doesn't the cpc in T & E and 3 core & E get sheathed like the other cores?

 

[Spark123]

Cost.

 

[Steve]

It gives a nice line to score your knife down, and a "cheesewire" to cut the outer sheath with

 

[JohnD]

also so that when you accidentally stick a spade or nail into it, you have a greater chance of also making contact with the CPC and letting the fault current flow to earth without going through your body

 

[Taylortwocities]

Probably because 6424Y specifies it. This will come from BS7671 stating that live conductors must be double insulated.
CPC is not a live conductor. (Unless misused )