hi all, i am looking to add 3 double sockets in to loft space as currently going through a conversion, what would be the best way to wire these in from an existing socket in the below bedroom.? thanks in advance
Two options: Create a 13A fused spur from the ring that feeds the bedroom sockets, and hang the three double sockets in the loft from that. Break into the ring that feeds the bedroom sockets and add the three loft sockets into that ring. The former is not notifiable, but the latter is notifiable.
Don't think either way is notifiable, only new circuits need notifying via the scam providers. You can extend ground floor and upstairs rings and lighting circuits for a new 3 bed extension and also possibly a new bathroom without having to sign anything off but you can't wire a single socket right next to the mains unit if its on its own MCB. So sleep easy tonight knowing the people that make out laws know what they are doing.
Forget if noticeable or not, the problem is testing, to extend a ring final the first you need to get the loop impedance of original circuit to be able to calculate if the loop impedance of the new circuit will take it out of the limits set for volt drop and automatic disconnection in the case of a fault. In the main the line - neutral loop impedance or prospective short circuit current is not recorded for indevual circuits, so you need to measure, there are two meters that can do this, the loop impedance meter and the low ohm meter latter must use 200 mA so not a simple multimeter. However the loop impedance required for a 13A spur is very different to that required for a ring final, so if the person doing the work has not got the meters required then the risk of going out of spec is far lower with a 13A spur than with an extension to the ring final. Ok no circuit should be modified without testing, but to try and tell DIY people they should not do the work themselves we know will fall on deaf ears, so pointing to use a FCU and fused spur is likely the best option, and if not already RCD protected then a RCD FCU can be used. It's not regulations or law, but doing a safe job.