Should internal links in consumer units be double insulated where TT earthing is present

[spud1]

Hi,

So I was reading the notes on regulation 531.3.5.3.2.201 (Page 156) today and noticed Note 1 that consideration should be given (Where TT earthing is present) to the manufacturer's internal line cable links on the supply side of an RCD being insulated AND sheathed! Does anyone know of any distribution equipment manufacturer that either fits double insulated cable links as standard or offers an alternative double insulated kit of leads?

Cheers

 

[Ian1981]

When were Wylex/Crabtree SP&SN RCBO's first introduce? I have a feeling that many TT installs have been none compliant since July 2015, if that's the case.

In what way ?
I’ve never seen an rcbo board with an RCCB as a main switch

 

[davesparks]

There is no requirement for a protective device to isolate the neutral under fault conditions, regardless of earthing system type.

Yes, another oversight in the regulations in my opinion.

 

[Midwest]

In what way ?
I’ve never seen an rcbo board with an RCCB as a main switch

I have sort of. But I've also seen a CU with RCBO's and a main switch, suitable for use with TT supply, as detailed in OSG (yellow) figure 3.6.3. My point is, there were very few if any DP RCBO's or SN back then.