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Well - if somebody wants to use it in a Class II appliance it has to have double or reinforced insulation....
 
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There are a lot of DI cables in aerospace applications.
That doesn't surprise me - only a few minutes ago I posted some comments about 'redundancy' in aeronautical engineering.

In terms of the standard domestic, commercial and industrial wiring cables, does the specification for the 'sheathing' include requirements in relation to its insulating properties?

Kind Regards, John
No idea, sorry. I left all the cable standards behind when I retired.
 
No idea, sorry. I left all the cable standards behind when I retired.
Fair enough. I do suspect that the specification for the sheaths of cables has requirements in terms of insulating properties - but I may, of course, be wrong!

Kind Regards, John
 
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I believe it depends on whether the sheath is intended to provide increased insulation or just mechanical protection.
 
I believe it depends on whether the sheath is intended to provide increased insulation or just mechanical protection.
Well, that's the issue under discussion with Risteard. Given that it is not permitted to have accessible/'exposed' live conductors which are protected by just a single layer of insulation (presumably because of perceived risks of electric shock), I would be inclined to think that the required additional 'layer' would be required to have insulating properties (presumably to some specified extent) - but I certainly don't know.

Kind Regards, John
 
The cable itself doesn't necessarily have to - and quite probably wouldn't.
So if I build a metal appliance with internal wiring, you are saying that the wiring does not have to have double or reinforced insulation for the appliance to be Class II? It would be OK for the internal wiring to have just single insulation, which if it failed could make the metalwork live?
 
The cable doesn't have to be DI for the appliance to be. A single insulated conductor could run in an insulated duct, or a plastic enclosure inside the metal one.
 
The cable itself doesn't necessarily have to - and quite probably wouldn't.
So if I build a metal appliance with internal wiring, you are saying that the wiring does not have to have double or reinforced insulation for the appliance to be Class II? It would be OK for the internal wiring to have just single insulation, which if it failed could make the metalwork live?
Yes, of course. It would even be OK for the internal cable to have NO insulation, if there were two levels of insulation (or one of reinforced insulation) between it and the outside world (including a metal outer casing/covering).

Kind Regards, John
 
But there aren't. There is just a metal case with wiring inside it
You're just being silly. In that case, a second layer of insulation obviously has to surround the conductor if you want the 'device' to be Class II - either as part of an acceptably 'double insulated' cable, or else using some sort of sleeving etc.

Kind Regards, John
 
What about those new metal class 2 2KW convector heaters with the bare stitched elements and only a small air gap between the thin sheet metal and the element?
 
We need a sparks combustion chamber....or should that be distribution cabinet?
 

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