Sub main advice please

[davesparks]

Thanks - 16mm T&E clipped direct to 1st floor joist then SWA trenched to garage all in all approx 15m. Will be earthed via current earth block at CU

Make your mind up, is it T&E or SWA? Surely you haven’t installed a such a short new circuit with a joint in it?

 

[Matthew]

Thanks to all the people who posted with helpful - non-judgemental advice, one of the reasons most of us use forums like this.

 

[telectrix]

i'd be concerned about bonding, esp. if it's PME. that cpc in the T/E will not be large enough to comply.needs 3 core SWA for the whole run.

 

[leep82]

Thanks - i am newly qualified but not registered with CPS so will be third party tested/inspected - just after peoples advice and experience

You dont need to be registered with a scheme to be able to carry out notifiable work. Im not, so i contacted my LABC. They requested copies of all my certificates to see i was competant and then put me on their list of registered electricians. Whenever i carry out notifiable work i have to apply for a building notice certificate from them, this costs £80 regardless of size of job. Long term it would probably be more beneficial for me to be part of a scheme but for now its how i get by.

 

[Spoon]

I have just read this thread. (Comp likes to play up on site site). The OP has been given some good points but looks like he has not acknowledged them.
Text is a funny thing and can be interpreted different ways.

 

[westward10]

Okay I have removed and tidied up some of the posts. Can we try and be respectful to one another and keep the thread on track. Thank you.

 

[mossep]

Hi

Depending on your installation method you could get away with a 63A MCB in the existing board if it has space, assuming your Zs at the new board is fine. You might get discrimination issues, but it’s hardly a critical installation that will cause life threatening issue if it does happen - you will have to have a think about that and any issues it may cause. Someone else mentioned fitting a fuse carrier rather than an MCB, thats a good idea if you can.

You could put a Henley block in and split the tails like you suggested, but there should be 1 point of isolation for the whole installation, so you might create more work doing it that way. In my experience, the majority of domestic customers want a cheap job rather than a well specced job.

Your 16mm T+E should be fine with regards to earthing, presuming its not being used as a bonding conductor. If it is being used as a bonding conductor then it will need to be sized appropriately. Is there services in the new area that need bonding, or are they supplied by plastic pipework?

 

[bigspark17]

Okay I have removed and tidied up some of the posts. Can we try and be respectful to one another and keep the thread on track. Thank you.

Youve changed your tune haha

 

[Matthew]

Mossepp - thank you for your detailed reply. My preference would be to split mains and add an isolator so will price up both methods! As for bonding - no - the new installation in entirely plastic pipe.

 

[MDJ]

Isolator? you will need an OCPD for the circuit, why 16mm2? did you calculate the load required? I bet that is overkill, also why a joint in a new cable run? have you got test equipment? there are plenty of other answers needed to the questions already asked to be fair.

 

[Octopus]

You could put a Henley block in and split the tails like you suggested, but there should be 1 point of isolation for the whole installation,

Really ............ reg number please?

 

[mossep]

Isolator? you will need an OCPD for the circuit, why 16mm2? did you calculate the load required? I bet that is overkill, also why a joint in a new cable run? have you got test equipment? there are plenty of other answers needed to the questions already asked to be fair.

I would imagine the joint is because it easy to terminate an SWA in an external adaptable box, and then run T+E internally to the fuse board. Not that uncommon really, aesthetically it might even look better on the outside wall as you'll struggle to put a neat bend in a 16mm SWA as it goes through the wall. Assuming its been done right what problems do you see with having a joint?

 

[mossep]

Really ............ reg number please?

462.1.201

 

[Baddegg]

What book is that in mossep?

 

['mr2'gd4u]

Why an isolator? It needs an OCPD not just a switch.

Nah... I was going to suggest a 10a light switch!! Lol