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420 Watt Hedge Trimmer.

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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.




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  • 0
    First thought, neither of the RCDs 'cos there is no mention of a fault to earth - our careless gardener hasn't picked up the live end of the severed cable.


    We have to make a few assumptions about the length of the various components of the circuit and then do some calculations ? before referring to the trip curves, but my guess is the 5 A fuse alone.
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  • 0
    First thought, neither of the RCDs 'cos there is no mention of a fault to earth - our careless gardener hasn't picked up the live end of the severed cable.


    We have to make a few assumptions about the length of the various components of the circuit and then do some calculations ? before referring to the trip curves, but my guess is the 5 A fuse alone.
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