- 17 Aug 2023
- 2 Minutes to read

- Print
- DarkLight
- PDF

# Electrical Formulas

- Updated on 17 Aug 2023
- 2 Minutes to read

- Print
- DarkLight
- PDF

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.

Term | Explained |
---|---|

`count` | total counts |

`len` | total metres measured |

`area` | total square metres measured |

`count, len or area / x` | total count/length/area divided by an amount |

`count, len or area * x` | total 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:

Part | Explanation | Formula | UMO |
---|---|---|---|

Double GPO | counted`Double GPOs` | `count` | each |

Wall bracket | Allowing for a for each double GPO`wall bracket` | `count` | each |

2.5mm twin and earth | How many are required when `metres` are allowed with each double GPO`12m` | `count*12` | m |

2.5mm twin and earth (100m cable drum) | How many are required when `metres` are allowed with each double GPO divided by a `12m` `100m drum` | `count*12/100` | drum |

2.5 cable clips | How many clips are needed when are required for each double GPO divided by a `5` `jar of 500` | `count*5/500` | jar |

LABOUR | |||

Labour | Allowing for for every double GPO counted as per the Labour Conversion Chart`30 minutes of Labour` | `count*0.5` | hours |

## Mains Cable Run

Example Parts for a mains cable run Length Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Mains cable runs | How many metres are required | `len` | m |

50mm HD conduit (orange rigid 4m) | How many of conduit required for the length measured`4m lengths` | `ceil(len/4)` | lengths |

16mm XLPE Four Core | How many required and allowing for an `total metres` measured to the switchboard`additional 4m per run` | `len+count*4` | m |

16mm SDI red cable (S/D insulated) | How many total metres measured multipled by required and allowing for an `3 lengths of cable` measured`additional 4m per run (making 12 in total for the 3 lengths)` | `len*3+count*12` | m |

16mm SDI black cable (S/D insulated) | How many required and allowing for an `total metres` `additional 4m per run` | `len+count*4` | m |

Warning tape underground orange (100m) | How many of tape required for the length measured`100m rolls` | `len/100` | rolls |

50mm sweeping bend (90° heavy duty orange) | sweeping bends required multiplied by `Number` `2` | `count*2` | each |

LABOUR | |||

Labour | Allowing for for every metre measured as per the Labour Conversion Chart`10 minutes of Labour` | `count*0.17` | hours |

## Airconditioning

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

Part | Explanation | Formula | UMO |
---|---|---|---|

Room areas | How many for each room measured`metres squared` | `area` | m2 |

KW rating | Area measured multiplied by and to convert to a KW rating, divided by `150 wattage per m2` `1000` | `area*150/1000` | KW |

Volume of air | The area measured multiplied by `2.7m ceiling height` | `area*2.7` | m3 |

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.

Organise your session today! Click Help > Send us a Message and ask to book in for free training.

Trainers can assist with:

- Workflow solutions
- Time-saving tips
- Making sure you're getting the most out of your subscription

If you've accessed your free training and need further Support, reach out to book a 1 or 2 hour paid session.