Double Insulated Tails ?

[Lioned]

Where does it say that meter tails have to be 'double insulated' ?

Also i have to change a fuse box in a flat soon,meter box is outside couple of meters down,tails go up the cavity in a tube,no way am i going to be able to change the tails without major diruption to new decor etc,Current tails are 25mm but not double insulated,ok to leave them ? or code 4 ?

Thanks.

 

[bugsy]

if there enclosed and protected leave rhem

 

[IQ Electrical]

Where does it say that meter tails have to be 'double insulated' ?

Also i have to change a fuse box in a flat soon,meter box is outside couple of meters down,tails go up the cavity in a tube,no way am i going to be able to change the tails without major diruption to new decor etc,Current tails are 25mm but not double insulated,ok to leave them ? or code 4 ?

Thanks.

Meter tails (6181-Y) are not actually 'double insulated' to the definition of BS7671:2008, they are insulated and sheathed, hence no 'box within a box' symbol on the drum or in manufacturers literature.

 

[Deleted member 26818]

Is this not re-inforced insulation?

 

[IQ Electrical]

Reinforced insulation is defined in standards as being a single layer of insulation offering the same degree of protection against electric shock as double insulation.

I think in the case of 'tails' it's more like 'supplementary insulation' as the manufacturers make no claims.

 

[andyb]

Where does it say that meter tails have to be 'double insulated' ?

Thanks.

521.10.1
Non sheathed cable to be enclosed in conduit, ducting or trunking.

So in your situation as the tails are in conduit it should be ok.

 

[vitalspark35]

If tails are exposed between conduit and new cons unit then 25mm sleeving over single insulated parts will suffice.
Mark same with L1 & N or correct colour coding.

Dave