On Sunday, 14 June 2015 17:08:02 UTC+1, ARW wrote:
If you do that then there should be a means of isolating the smokes whilst
still leaving the lights powered up.

Perhaps in theory, but I'm unhappy about having isolators on smoke alarms in case it's left off.

Anyway, I didn't fit an isolator as I used the smoke alarm circuit to back feed half the lights.

Owain