Domestic · Brighton & Hove

Extra bedroom socket — ring extended through lath & plaster

Additional twin socket added to a bedroom by extending the existing ring final circuit. A little more involved than a standard chase — the wall was traditional lath and plaster, so extra care was taken to route cable neatly without disturbing the finish. Minor works; existing surge protection already in place at the consumer unit. Full inspection & test carried out to BS 7671 with Megger MFT — R1+R2, insulation resistance, Zs, RCD disconnection time and polarity all recorded.

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  Finished twin 13A socket flush-fitted into a lath and plaster bedroom wall

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  Existing single twin socket on the bedroom wall before works began

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  Existing MK Sentry consumer unit with Type 2 surge protection (SPD) already fitted

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  Milwaukee multi-tool, insulated screwdrivers and back box laid out on dust sheets — chasing lath and plaster

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  Close-up of the drop route showing original lath and plaster construction

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  Neat rectangular chase cut into the lath and plaster wall for the new back box

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  Chase opened up showing the cable drop behind the lath ready for the ring extension

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  New 35mm back box fitted into the lath and plaster with earth-sleeved conductors dressed in

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  A spike from the original socket to find where to cut the new socket in on the bedroom wall (Precision work!)

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  CPC (earth) properly sleeved with green/yellow before termination — as required by BS 7671

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  Test leads on the ring conductors ready for an R1+R2 end-to-end continuity test

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  Megger MFT-X1 continuity result — 0.50 Ω on the extended ring, well within limits

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  Faceplate hanging off during first-fix testing — earth continuity and polarity checks

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  TIS 1005 loop/RCD checker on the new socket confirming correct wiring

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  TIS 1005 loop/RCD checker plugged into the new socket for a live loop test

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  Green 'good' indicator on the loop tester — polarity, earth and Ze all pass

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  Megger MFT-X1 RCD disconnection time result — 40.0 ms at I∆n, well inside the 300 ms limit for an RCD-protected circuit

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  Just the final tidy-down to do — dust sheets, debris to be cleared and the finished socket left tested and ready to use