hi. My main fuse board has a 16amp mcb feeding the garage. In the garage I have a small fuse board with the main MCB rated to 100amps.
It now seems that on the odd occasion the combined load of a 13amp hot tub, fridge and flood light causes the 16amp mcb to trip in the house. combined startup load?
My question is, should the garage MCB be rated to 100amps? Should the downstream breaker be less than the upstream breaker? In my case, the 100amp breaker will never trip, so it doesn't seem to serve a purpose.