I've a really small job to quote ( adding a fused spur off an existing radial ) in a care home ,with a decent , but fairly old wylex board . am i right in assuming i have to fit an AFDD ?? , I know i would if it was a new circuit being installed , but being only a fused spur off an existing radial , it seems a massive expense for what is supposed to be an easy job ?? can't seem to find any conclusive answers on line anywhere .
any thoughts would be appreciated