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Now that I've got permission from the council to start my garage wiring, there are a few questions I'm not sure about.
Background: For the CU would be simple for me buy one with one 32 and one 6A mcb and a 40A rcd already fitted. There is an existing submain going to an outhouse that I'm wondering if I can reuse (outhouse is being disconnected) as it will save me time, effort and money. It's on a 32A mcb with 4mm2 SWA. Was thinking of an internal junction box so I can extend this to reach the garage, 35m total. Online calculators tell me that voltage drop should be fine for a directly clipped installation and 32A. Nothing out of the ordinary being used in the garage so 32A supply is fine.
Questions: Can I install a CU with 40A rcd with 32A+6A mcb's on a 32A submain? Will the voltage drop actually be ok for this? How do I determine if the SWA armour has enough capacity to be used as the sole earth?
Only other question that I think I know the answer to but wanted to check, I don't have to enclose exposed wiring in conduit inside the garage do I? I think it's ugly stuff, I'd rather clip directly to the wall.
Thanks!
Background: For the CU would be simple for me buy one with one 32 and one 6A mcb and a 40A rcd already fitted. There is an existing submain going to an outhouse that I'm wondering if I can reuse (outhouse is being disconnected) as it will save me time, effort and money. It's on a 32A mcb with 4mm2 SWA. Was thinking of an internal junction box so I can extend this to reach the garage, 35m total. Online calculators tell me that voltage drop should be fine for a directly clipped installation and 32A. Nothing out of the ordinary being used in the garage so 32A supply is fine.
Questions: Can I install a CU with 40A rcd with 32A+6A mcb's on a 32A submain? Will the voltage drop actually be ok for this? How do I determine if the SWA armour has enough capacity to be used as the sole earth?
Only other question that I think I know the answer to but wanted to check, I don't have to enclose exposed wiring in conduit inside the garage do I? I think it's ugly stuff, I'd rather clip directly to the wall.
Thanks!