Spur off a 3036 protected circuit?

[alanl]

I've been asked to add a spur (or possibly extend the ring) on a BS 3036 protected circuit.
Dead basic job, just needs an extra socket in a bedroom.

From my understanding, this can be put down as a Minor Works, but all sockets now have to be RCD protected to comply with the 17th, so if I'm putting in a new socket, does this circuit have to be modified to have RCD protection?

If so, then would it be classed acceptable to move the existing socket 6 feet to the other side of the room, without adding RCD protection?

(the reason being, the customer will not pay for a CU upgrade)

On a similar point, the TN-C-S incomer has a 10mm cable from the MET to the Fusebox. Do I need to upgrade this to 16mm when adding the socket?

Thanks
Alan.

 

[Deleted member 9648]

Thats what I was going to say RCD spur then feed normal socket from that then its all good !! The RCD socket would only protect plug onwards,the bonding just note on cert.

No main bonding and all's good??.....me thinks your priorities on this are a bit --- over --- if you will insist on one socket upstairs being on a RCD (FCU!!)....and yet ignore the essentials.
Presumably you are going to use the RCD -FCU to feed the socket so that ...1. The socket is RCD protected..and 2. The buried cable to the socket is also RCD protected?
What about the buried cable to your FCU?...or is that going to be surface?
If you are going down this ridiculous road for ONE socket upstairs TBH you may as well install an RCD in an enclosure alongside the DB.
It is worth bearing in mind that RCD protection to sockets is only required for sockets intended for general use......if this proposed additional socket was intended for a specific item of equipment such as a computer ,and labelled as such ,it would still meet the requirements with no RCD protection....411.3.3 (b)

 

[pushrod]

With reference to earthing and bonding this answer from the ESC might be of interest , it's Q5

Can I carry out an alteration or addition to an existing installation that has inadequate earthing and/or bonding arrangements?

No. Any alteration or addition to an existing installation must comply with the current edition of BS 7671 (including any amendments). This requires any earthing and bonding arrangements upon which the alteration or addition relies for safety to be adequate. Any exposed-conductive-parts of the new work must not be simultaneously accessible with exposed-conductive-parts of the existing installation that are not connected to the same earthing system.




Regulation number(s)

• 131.8
• 633.2
• 411.3.1.1