Spot what's wrong

[Redvanman]

For the eagle eyed out there, can you tell me whats wrong with this arrangement and for a bonus point what reg. no. would apply.

The only bit of info you need is that its a TT system.

 

[stimpy]

Close 2K + VAT
11 circuits

Hehe, i thought it would be bonkers... So £1100/£1200 labour dependant on his wholesale discounts I'd like one of those a week.....

 

[Flanders]

see next post

 

[Flanders]

Sorry had you go do a job.

Right the list of problems I noted were and you cant see most of then:

No neutral link between main switch and neutral bar therefore only single pole isolation on a TT system.
No grommet/ bush/gland for incoming tails therefore a RCD required as main switch or before board. If glanded correctly then RCD not needed as the meter is below
All lighting circuits have no cpc with metal switches and lights in use. Even through the cable entering the board has cpc. Under the board theres a piece of 2x2 plastic trunking stuffed full of the old cables all thro crimped to extend into new board. The old cable has no cpc but new cable does.
No testing was done before or after the install.
No labels except RCD warning (I no some of you dont like labels but its in the book)
No circuit chart

Someone made a note re ring circuits but all circuits do have RCBO's but in picture you cant see the left hand side fully.

Take a stab at how much he was charged and any thoughts on the reg no yet.

Still Need an UP front 300ma RCD on a TT system

 

[Bobster]

Still Need an UP front 300ma RCD on a TT system

Do you?

 

[Flanders]

Do you?

Yes its A TT system so see Reg 411.5.2 ,also see table 41.5.which will show if the earth loop impedance is 167 or less then a 300mA RCD will do the Job , I suggested 300ma as Earth loop reading from a earth Rods generally around the 70 to 100 Ohm mark, off course if you are getting a much lower reading say if the structural steel is being used and the ZS is low enough then you could get away with just over current protection reg 411.5.2 (ii) and to be fare I did jump to conclusions as the op stated it was a TT system and most TT systems are above the permitted ZS for an over current device , but from experience of ground conditions changing over time I would go for the 300ma , which also would give you the disconnection of the neutral and so solving the original deviation of on un-switched neutral

 

[Bobster]

So you don't need a 300ma upfront.

 

[Flanders]

So you don't need a 300ma upfront.

The correct answer is we don't know because the OP has not given us the Zs so I apologies for jumping in and assuming there was a high Zs and that an RCD was needed , and yes I know you should never assume anything when it comes to electrics :6:

 

[Bobster]

I'm pulling your leg.

Just don't want the inexperienced thinking it's the only option.

 

[Flanders]

I'm pulling your leg.

Just don't want the inexperienced thinking it's the only option.

Its a fare point and glad you pointed it out