The owner of the 420 Watt hedge trimmer decided to redesign the 0.75mm2 two core flex by cutting through it. This caused a dead short. His house is supplied by a TN-C-S supply. It has a consumer unit in the house with a B16 M.C.B. dedicated to supply his garage. The house consumer unit is a split load type with 30mA R.C.D.s. The hedge trimmer had a 13 amp plug fuse fitted. It was supplied via an extension lead fused at 5 Amps.
In the garage, where the hedge trimmer was plugged in, there is a two way garage unit with a B16 M.C.B. for the sockets and a 30 mA R.C.D.
When the hedge trimmer flex was cut through which protective device(s) tripped off or ruptured?
Z.
