Scenario: "I'd like a single smoke alarm hard wired in my house so I don't have to worry about changing the batteries if I decide to rent it out in the future" says the customer.
right, smoke alarm in hallway off of upstairs lighting circuit, 0.5m away from ceiling rose. So far so good. Check CU... 2 b6 mcb s for upstairs and downstairs lighting, not protected by rcd. Ahhh. Will require an RCBO as well. And it's notifiable works. check lighting circuits... Looks like there's a borrowed neutral...
So the options I see are: surface trunk the new smoke across the ceiling (won't be an option for most customers) so no rcbo needed; or run an earthed metallic sheathed cable (is there a cable that's practical for this?);or put both living circuits onto one rcbo if loading is appropriate and wire smoke normally; or start ripping the house apart feeding new cables for the lights and putting in new RCBOs for lighting circuits.
A quick cheap job turned into an expensive one, or am I missing a simpler way to do this?
right, smoke alarm in hallway off of upstairs lighting circuit, 0.5m away from ceiling rose. So far so good. Check CU... 2 b6 mcb s for upstairs and downstairs lighting, not protected by rcd. Ahhh. Will require an RCBO as well. And it's notifiable works. check lighting circuits... Looks like there's a borrowed neutral...
So the options I see are: surface trunk the new smoke across the ceiling (won't be an option for most customers) so no rcbo needed; or run an earthed metallic sheathed cable (is there a cable that's practical for this?);or put both living circuits onto one rcbo if loading is appropriate and wire smoke normally; or start ripping the house apart feeding new cables for the lights and putting in new RCBOs for lighting circuits.
A quick cheap job turned into an expensive one, or am I missing a simpler way to do this?