Meter tails, Insulated and sheathed or double insulated???

[the_mouse]

Hi, I was talking to the main cable designer for Prysmian (my main employer), who tells me that meter tails are insulated and sheathed not double insulated.

The term "double insulated" was a nickname for them simply because they went through the insulating machine twice as they were too small for the oversheathing lines to apply the final sheath. He went on to say that the outer sheath is a protection layer for the insulate and its inegrity cannot be verified and thats one reason why they dont carry the double box symbol..

what are your thoughts on this, do you agree??

 

[initforthemoney]

He is correct.

 

[Evans Electric]

He's right Ratty , 6181Y cable insulated and sheathed . The term " double Insulated" is applied to that type of cable erroniously by many sparks , I'd say it came about to differenciate that type of cable from 6491X conduit, insulated only , cable .

The outer sheath is the mechanical protection.

The double insulated ,box within a box is a different thing altogether .

 

[kerching]

Correct...although I am 54 and still call it 'Double covered'....there again I still call 'green and yellow striped ECC protective sleeving' Green Sleeving! and always will I suppose

 

[Sidewinder]

Deffo insulated & sheathed, the sheath is not an insulator.

Hence 1 reason for never using the cpc in a flat twin as a live conductor as it is uninsulated!

 

[Evans Electric]

Correct...although I am 54 and still call it 'Double covered'....there again I still call 'green and yellow striped ECC protective sleeving' Green Sleeving! and always will I suppose

Me too !

I Also call CPC s earth wires and TNC-S is still PME I'm afraid ...Oh and a Luminair is still a light fitting .

 

[Sidewinder]

^+1 and you two have a few years on me!

:innocent

 

[Adrian]

and the telephone box GPO

 

[spinlondon]

I've always understood these to be reinforced insulation.

 

[Larnacaman]

Oh and a Luminair is still a light fitting .

That's French, the posh way of calling a lighting fitting ...''Luminaries''

Didn't realise you Welsh were so posh down in the Valley's.....

 

[Larnacaman]

Oh and a Luminair is still a light fitting .

That's French, the posh way of calling a lighting fitting ...''Luminaries''

Didn't realise you Welsh were so posh down in the Valley's.....