Well - if somebody wants to use it in a Class II appliance it has to have double or reinforced insulation....
The cable itself doesn't necessarily have to - and quite probably wouldn't.Well - if somebody wants to use it in a Class II appliance it has to have double or reinforced insulation....
No idea, sorry. I left all the cable standards behind when I retired.That doesn't surprise me - only a few minutes ago I posted some comments about 'redundancy' in aeronautical engineering.There are a lot of DI cables in aerospace applications.
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
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!No idea, sorry. I left all the cable standards behind when I retired.
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.I believe it depends on whether the sheath is intended to provide increased insulation or just mechanical protection.
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 itself doesn't necessarily have to - and quite probably wouldn't.
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).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 itself doesn't necessarily have to - and quite probably wouldn't.
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.But there aren't. There is just a metal case with wiring inside it
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