I'm planning the wiring on a 2 storey extension.
Current CU is full, with the following ccts: RCD(40A shower, 32A sockets), MCB(6A lights up,6A lights down,6A smoke, 32A cooker).
Current loading on lighting circuits is 590W upstairs and 840W downstairs. The new lighting will give an extra 300W load on upstairs lights and 730W load downstairs.
Floor area of existing house is 100m^2, the extension results in an additional 50m^2.
The kitchen in the original house is to be moved (still within the original house), and an induction hob will replace the current electrical hob.
The existing gge circuit is fed from a 13A plug, so a new cct for a detached garage is required.
The hot water cylinder has an immersion heater which isn't currently connected.
The current CU is in an understair cupboard. The wiring bundle feeding the CU will have to be re-routed as the stairs are rotating through 180 degrees.
I was thinking of adding additional RCD circuits as follows: 32A Extension sockets, 32A New kitchen ring, 6A New lights down, 16A gge, 16A immersion.
The original 40A shower feed can be used for the induction hob (new bathroom, plumbed HW shower)
Questions I have are as follows:
1. Do i need a new ring for the kitchen? The old 32A cooker feed can be used for the new (double) oven, along with a separate 40A hob supply.
2. Is it ok for the induction Hob to be on the RCD? I could swap this with the smoke alarms and add the new extension detector to it for 17th ed compliance.
3. Should i replace the original CU with a split load 12 (10?) way 17th edition, or go for an additional RCD protected CU via 100A isolator and Henley block.
Meter---100A---Henley-----New CU(RCD only) + -- Original CU(100A+RCD)
4. If I go for a single CU, will all the existing circuits have to comply with 17th edition? If so, it will have to be a separate CU.
Any other insights or recommendations would be appreciated.
Current CU is full, with the following ccts: RCD(40A shower, 32A sockets), MCB(6A lights up,6A lights down,6A smoke, 32A cooker).
Current loading on lighting circuits is 590W upstairs and 840W downstairs. The new lighting will give an extra 300W load on upstairs lights and 730W load downstairs.
Floor area of existing house is 100m^2, the extension results in an additional 50m^2.
The kitchen in the original house is to be moved (still within the original house), and an induction hob will replace the current electrical hob.
The existing gge circuit is fed from a 13A plug, so a new cct for a detached garage is required.
The hot water cylinder has an immersion heater which isn't currently connected.
The current CU is in an understair cupboard. The wiring bundle feeding the CU will have to be re-routed as the stairs are rotating through 180 degrees.
I was thinking of adding additional RCD circuits as follows: 32A Extension sockets, 32A New kitchen ring, 6A New lights down, 16A gge, 16A immersion.
The original 40A shower feed can be used for the induction hob (new bathroom, plumbed HW shower)
Questions I have are as follows:
1. Do i need a new ring for the kitchen? The old 32A cooker feed can be used for the new (double) oven, along with a separate 40A hob supply.
2. Is it ok for the induction Hob to be on the RCD? I could swap this with the smoke alarms and add the new extension detector to it for 17th ed compliance.
3. Should i replace the original CU with a split load 12 (10?) way 17th edition, or go for an additional RCD protected CU via 100A isolator and Henley block.
Meter---100A---Henley-----New CU(RCD only) + -- Original CU(100A+RCD)
4. If I go for a single CU, will all the existing circuits have to comply with 17th edition? If so, it will have to be a separate CU.
Any other insights or recommendations would be appreciated.
