Installing a Consumer Unit in Garage

[Spark123]

Maybe double insulation was a bad way of putting it, I meant the innards of the SWA don't count as a sheathed cable.

 

[NotHimAgain]

martinxxxxxx said

The fact that there are two layers of insulation does not mean any electrical item is double insulated in the meaning of the regulations, it has to be manufactured to a different standard (BS 2754 : 1976) and carry the symbol for double insulation. Not just simply have two layers of insulation

That is the only way to tell if an item is classII or not. No symbol treat as ClassI

Hope this helps

I suggest you read 412.2.4.1, and then section 412.2 generally

 

[martinxxxxxx]

You're right , I was thinking electrical equipment, damm that PAT testing course I took last week and its silly aid memoirs (no symbol = class1).

I'd prefer to see a conduit for mechanical protection if this method was to be selected . I am not sure what the upside of doing it this way would be. Have you had occasion to use a Class 2 wiring system? if so Why was it used?

Martin

 

[NotHimAgain]

Class 2 wiring systems do exist and some are very large - http://www.eaton.com/EatonCom/ProductsServices/MEM/LiteratureLibrary/index.htm

Look at the PDFs on the Halyester systems.

In the domestic environment there are quite rare but you may consider the 'double insulated' tails from the meter to a CU on a TT system to be class 2.

Technically you could use such a system for a shed supply with an RCD at the shed end. However, if the cable is buried you may fall foul of Part 5 of BS 7671 - I don't have the big red bumper fun book (BS 7671) to hand at the moment to check - as I am in a small hotel in North West London at the moment - ready to deliver a 3 day 17th Edition course at the local golf club - a snip at £561 + VAT if anyone is interested