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

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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


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Download a PDF copy of Using Formulas within Groundplan here.



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