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RCD arrangement for garden workshop

JDW
I would like to supply a small workshop/shed with power, which is approximately 5m from my house. The house is a TN-S system

I’ve had a couple of electricians suggest several different ways

They all seem to have different ideas where the RCD should be?

 
  • RCD in main property

  • RCD in workshop (no RCD on SWA to workshop)

  • Two RCDs main property & workshop


Which would be the preferred method?
Parents
  • 0
    Well unless the sparks cannot terminate SWA. armour correctly, or the Zs is very high at the board so a pick axe would not blow a fuse, all that is needed is some gross

    over current protection for the SWA and for the armour to be earthed at origin.


    Then order of ascending cost at the shed end some options.

    An RCD and a fused spur for the lights,  Note that lights and power trip together for both overload and earth faults

    or  RCD and 2 MCBs, one for lights one for power for two circuits. Note that in this set up lights and power trip together for earth faults, but not overloads

    or an ordinary switch and  two RCBOs if you would like separated lights that stay on with a power fault, earth or overload.


    Some electrical contractors  have not progressed beyond a catalogue of standard solutions.

    M.


Reply
  • 0
    Well unless the sparks cannot terminate SWA. armour correctly, or the Zs is very high at the board so a pick axe would not blow a fuse, all that is needed is some gross

    over current protection for the SWA and for the armour to be earthed at origin.


    Then order of ascending cost at the shed end some options.

    An RCD and a fused spur for the lights,  Note that lights and power trip together for both overload and earth faults

    or  RCD and 2 MCBs, one for lights one for power for two circuits. Note that in this set up lights and power trip together for earth faults, but not overloads

    or an ordinary switch and  two RCBOs if you would like separated lights that stay on with a power fault, earth or overload.


    Some electrical contractors  have not progressed beyond a catalogue of standard solutions.

    M.


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