Outside Shed Supply

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Gloucestershire
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Can anyone help with this question....
Have an ouside shed which is supplied by a SWA cable from the house supply. The supply is not protected with an RCD and the CU is an old style rewirable fuse type.
The SWA to the shed is terminated into a new CU protected by a 30mA RCD and has a 6A & 16A MCB.
If i run two new circuits for lighting and a 13A Socket, will the whole installation back to the house CU need to be tested, Inspected and certified under Part p or just the new circuits in the shed back to there respective CU.
Cheers if some one can help.
 
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I understand the circuits leaving the shed CU are fully RCD protected?

The installation back to the house will have to be tested inasumuch as it affects the new circuits. In particular the means of earthing / exporting the earth will have to be tested back to the origin of the installation.

SWA cable does not have to be protected by an RCD.

The existing SWA cable and its supply fuse will have to be adequate for the increased design load on the cable, taking diversity on the shed CU into account.

The single RCD in the shed might not now be acceptable as the circuits are supposed to be spread over sufficient RCDs to minimise the effects of tripping on a fault on other circuits that aren't faulty.
 

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