Pretty sure my cps assessor was wrong

[AndyL]

So I had my yearly assessment today with my friendly local engineer. He was fair enough but there was 2 points he pulled me on that have niggled me because I am sure I was right.
Would like some other opinions please.

Firstly a 60 Amp TN-S supply to a domestic property. ... what is the minimum size tails?
Secondly do you guys tick the double insulated box in S.O.I because of the meter tails?

I'll let you know who was in each corner after a few replies so as not to sway your decision ( as if it could)

 

[AndyL]

I know, makes no sense whatsoever

 

[Des 56]

He actually said it had to be 25mm because the cuu main switch is rated at 100A.

I wonder what cable size he would dismiss as not suitable for a outside light that has a 20 amp double pole switch for isolation

 

[DPG]

Like ^^^

 

[Wilko]

He actually said it had to be 25mm because the cuu main switch is rated at 100A.

Hi Andy, yes similar nonsense heard once re domestic board with multiple final circuit mcbs (all correctly selected and installed) adding up to over 100A installed capacity. Does my head no good at all.

 

[Midwest]

He actually said it had to be 25mm because the cuu main switch is rated at 100A.

I did a CU replacement a while back. On of the CU's was for the off peak heating & hot water, it had a 100amp main switch. The off peak meter (Ec 10) had two out puts, and the one for the hot water, would only accept a 10mm cable.

 

[Adie moore]

did you pass though? I'd guess he was just swinging his dick to let you know who's the boss. discretions the better part of valour and all that.

 

[Deleted member 26818]

Lol.
Insulated and sheathed tails are deemed as being double insulated.
T&E is not, because the Earth conductor is uninsulated.
ADS is the usual method of protection, as long as the installation is not TT and/or the length of the tails is less than 3m.
10mm2 conductors would generally be adequate for 60A.

 

[Simonslimline]

was the assessor aware that the "on site guide" is a guide and not the regs?

They need to try and justify there existence somehow I guess.