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    Electrical Formulas
    • 17 Aug 2023
    • 2 Minutes to read
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    Contents

    Electrical Formulas

    • Updated on 17 Aug 2023
    • 2 Minutes to read
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    • PDF
    Article Summary

    Before reading this article, ensure you have read Measurement - Parts & Labour and Using Formula within Groundplan articles to aid in understanding the following Formula examples.

    📝 The Formula values provided in this article are for example purposes only.

    TermExplained
    counttotal counts
    lentotal metres measured
    areatotal square metres measured
    count, len or area / xtotal count/length/area divided by an amount
    count, len or area * xtotal count/length/area multiplied by an amount
    ceil(x)rounding up a decimal value to the next whole number

    Double GPO

    Example Parts for a double GPO Count Measurement:

    electrical-double-gpo.png

    PartExplanationFormulaUMO
    Double GPODouble GPOs countedcounteach
    Wall bracketAllowing for a wall bracket for each double GPOcounteach
    2.5mm twin and earthHow many metres are required when 12m are allowed with each double GPOcount*12m
    2.5mm twin and earth (100m cable drum)How many metres are required when 12m are allowed with each double GPO divided by a 100m drumcount*12/100drum
    2.5 cable clipsHow many clips are needed when 5 are required for each double GPO divided by a jar of 500count*5/500jar
    LABOUR
    LabourAllowing for 30 minutes of Labour for every double GPO counted as per the Labour Conversion Chartcount*0.5hours


    Mains Cable Run

    Example Parts for a mains cable run Length Measurement:

    electrical-mains-cable.png

    PartExplanationFormulaUMO
    Mains cable runsHow many metres are requiredlenm
    50mm HD conduit (orange rigid 4m)How many 4m lengths of conduit required for the length measuredceil(len/4)lengths
    16mm XLPE Four CoreHow many total metres required and allowing for an additional 4m per run measured to the switchboardlen+count*4m
    16mm SDI red cable (S/D insulated)How many total metres measured multipled by 3 lengths of cable required and allowing for an additional 4m per run (making 12 in total for the 3 lengths) measuredlen*3+count*12m
    16mm SDI black cable (S/D insulated)How many total metres required and allowing for an additional 4m per runlen+count*4m
    Warning tape underground orange (100m)How many 100m rolls of tape required for the length measuredlen/100rolls
    50mm sweeping bend (90° heavy duty orange)Number sweeping bends required multiplied by 2count*2each
    LABOUR
    LabourAllowing for 10 minutes of Labour for every metre measured as per the Labour Conversion Chartcount*0.17hours


    Airconditioning

    Example Parts for a 2.7m height ceiling airconditioning Area Measurement:

    electrical-airconditioning.png

    PartExplanationFormulaUMO
    Room areasHow many metres squared for each room measuredaream2
    KW ratingArea measured multiplied by 150 wattage per m2 and to convert to a KW rating, divided by 1000area*150/1000KW
    Volume of airThe area measured multiplied by 2.7m ceiling heightarea*2.7m3


    For Formula assistance, please reach out to Support. Go to: Help > Send us a Message.

    Download a PDF copy of Using Formulas within Groundplan here.


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    Attachments
    Using Formulas in Groundplan.pdf
    2 MB
    Labour Conversion Chart 2023.pdf
    439.38 KB
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