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Steel Shed Wiring

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  • 30-08-2017 10:12pm
    #1
    necstandards
    Registered Users Posts: 190 ✭✭


    Hi - Just have a new steel shed installed with SWA cable ran from house CU on a GE Series 3000 Ne 20 Amp Type C MCB.
    I have 4 x 40W led battens lights fitted and want to fit 4 x double sockets mainly for power tools but one for an inverter welder.

    Would appreciate what cable, Shed CU and breakers i need to complete the job

    Tks
    J


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    #2
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,595 Mod ✭✭✭✭2011


    A 20A MCB will limit you in terms of the size of the load that can be supplied (no more than one power tool on at a time)
    Power tools can draw a large current.

    What size is the welder (in kW or kVA)? Depending on the type of welder it may cause the RCD to operate. In this case it may be better to install a sub-board in the shed with a non-RCD protected circuit for the welder, in addition to an RCBO for the sockets and another non-RCD protected circuit for lights.

    A few factors determine cable size, these include:
    ⦁ Length of run
    ⦁ Rating and type of MCB
    ⦁ The nature of the supply that this cable is fed from
    ⦁ The load it is supplying
    ⦁ Type of cable
    ⦁ Method of installation

    In your case the minimum size I would consider would be a 3 x 6mm sq. cable (assuming that the shed is some distance away from the house).

    As this requires working on the distribution board it is not something that should be done by a anyone other than an electrician. It should be noted that legally this work can only be carried out by an registered electrical contractor.


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    #3
    kramer1
    Closed Accounts Posts: 305 ✭✭kramer1


    Would you need to bond a steel shed?


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    #4
    Risteard81
    Registered Users Posts: 2,567 ✭✭✭Risteard81


    kramer1 wrote: »
    Would you need to bond a steel shed?
    Because it's an extraneous conductive part.


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    #5
    Bass Reeves
    Registered Users Posts: 18,685 ✭✭✭✭Bass Reeves


    kramer1 wrote: »
    Would you need to bond a steel shed?

    Most definately.

    Slava Ukrainii



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    #6
    kramer1
    Closed Accounts Posts: 305 ✭✭kramer1


    So run a 10sq earth out as well?


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    #7
    Bass Reeves
    Registered Users Posts: 18,685 ✭✭✭✭Bass Reeves


    kramer1 wrote: »
    So run a 10sq earth out as well?

    If there is an earth in the SWA you use that AFAIK to bond both the house and the garage supplies togeather. AFAIK best practice is a new earth bar as if you use a seperate earth supply if it ever got cut your shed would not be bonded. The risk of the earth from the bar getting interupted is way less.

    Slava Ukrainii



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