Absolutely no earth for lighting circuit.

[Deleted member 26818]

Found in many domestic installations, usually the only method of providing protection to tails in TT installations.

 

[davesparks]

Found in many domestic installations, usually the only method of providing protection to tails in TT installations.

I've never come across it, I've only ever seen insulated and sheathed, not double insulated

 

[gnselectricals]

Think solar dc cable is DI or reinforced

 

[Deleted member 26818]

Insulated and sheathed, is reinforced insulation.
Reinforced insulation is accepted as being double insulation.
Should be somewhere in the book.

 

[Risteard]

Insulated and sheathed, is reinforced insulation.

It's not. The insulating properties of the sheath have not been tested.

 

[Deleted member 26818]

I wonder why we bother writing these Regs, no one ever reads them.
412.1 Double or reinforced insulation is a protective measure in which:
(i) basic protection is provided by basic insulation and fault protection is provided by supplementary insulation, or
(ii) basic and fault protection are provided by reinforced insulation between live parts and accessible parts.
NOTE: This protective measure is intended to prevent the appearance of dangerous voltage on accessible parts of electrical equipment through a fault in the basic insulation.

 

[davesparks]

Insulated and sheathed, is reinforced insulation.
Reinforced insulation is accepted as being double insulation.
Should be somewhere in the book.

No, what the book actually says is that insulated and sheathed cables may be considered to provide equivalent protection to double or reinforced insulation subject to certain criteria.

I don't have the book to hand though for a reference

 

[davesparks]

I wonder why we bother writing these Regs, no one ever reads them.
412.1 Double or reinforced insulation is a protective measure in which:
(i) basic protection is provided by basic insulation and fault protection is provided by supplementary insulation, or
(ii) basic and fault protection are provided by reinforced insulation between live parts and accessible parts.
NOTE: This protective measure is intended to prevent the appearance of dangerous voltage on accessible parts of electrical equipment through a fault in the basic insulation.

If you read the whole section you will find the note that deals with insulated and sheathed cables

 

[Deleted member 26818]

Is that the note relating to wiring systems installed in accordance with Chapter 52?

If you seriously don't think that sheathed cables are not reinforced/double insulated, then I guess you will be condemning every TT installation you come across for lack of fault protection for the tails.

 

[davesparks]

As I said, I don't have the book to hand. Only working off memory from the last time I had to concern myself with that section.

 

[Midwest]

You lot need to go to sleep at a normal time, or are you on nights?