Been to look at a job where they want some new circuits connecting up (new ring and lights).
Existing CU is a 4 way wylex rewireable. No RCD in sight (no spare ways)
Cutout is PME with 100A carrier (not sure actual fude rating), tails are 16mm (running inside the cavity), earth is 6mm (running in cavity)
Cutout is located on outside of the wall, CU is on the side of the wall tight against the ceiling.
Gas is 6mm, Water is also 6mm (from CU).
The owners dont really want the existing CU touched,incase of problems converting over to 17th board (but they have left the final decision to me).
They dont want the inside wall damaging, so I am think of henley blocks, splitting to 25mm three core SWA (will put a metal box inside the cutout box and earth it) running up outside wall and in to the new CU (for just the new circuits).
Can I be naughty and leave the old tails/earth to the old CU as is (bar inserting the henley blocks)?
Was thinking about fit a MET into the cutout box, 16mm earth from the cutout to the MET (leaving the original 6mm in place from the cutout - want to avoid touching any of the old stuff), and use one of the SWA cores to take the earth to the CU.
I could, at a push, fit new 10mm's to the water and gas - sorry kitchen but the smakkest hammer I have is 6lbs!
Opinions? (bar getting a smaller hammer!)
Oracle.
Existing CU is a 4 way wylex rewireable. No RCD in sight (no spare ways)
Cutout is PME with 100A carrier (not sure actual fude rating), tails are 16mm (running inside the cavity), earth is 6mm (running in cavity)
Cutout is located on outside of the wall, CU is on the side of the wall tight against the ceiling.
Gas is 6mm, Water is also 6mm (from CU).
The owners dont really want the existing CU touched,incase of problems converting over to 17th board (but they have left the final decision to me).
They dont want the inside wall damaging, so I am think of henley blocks, splitting to 25mm three core SWA (will put a metal box inside the cutout box and earth it) running up outside wall and in to the new CU (for just the new circuits).
Can I be naughty and leave the old tails/earth to the old CU as is (bar inserting the henley blocks)?
Was thinking about fit a MET into the cutout box, 16mm earth from the cutout to the MET (leaving the original 6mm in place from the cutout - want to avoid touching any of the old stuff), and use one of the SWA cores to take the earth to the CU.
I could, at a push, fit new 10mm's to the water and gas - sorry kitchen but the smakkest hammer I have is 6lbs!
Opinions? (bar getting a smaller hammer!)
Oracle.
but thats not been verified of course 
