Electrical Formulas

Updated on 13 Feb 2024
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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	`Double GPOs` counted	`count`	each
Wall bracket	Allowing for a `wall bracket` for each double GPO	`count`	each
2.5mm twin and earth	How many `metres` are required when `12m` are allowed with each double GPO	*`count12`**	m
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 drum`	*`count12/100`**	drum
2.5 cable clips	How many clips are needed when `5` are required for each double GPO divided by a `jar of 500`	*`count5/500`**	jar
LABOUR
Labour	Allowing for `30 minutes of Labour` for every double GPO counted as per the Labour Conversion Chart	*`count0.5`**	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 `4m lengths` of conduit required for the length measured	`ceil(len/4)`	lengths
16mm XLPE Four Core	How many `total metres` required and allowing for an `additional 4m per run` measured to the switchboard	*`len+count4`**	m
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)` measured	*`len3+count12`*	m
16mm SDI black cable (S/D insulated)	How many `total metres` required and allowing for an `additional 4m per run`	*`len+count4`**	m
Warning tape underground orange (100m)	How many `100m rolls` of tape required for the length measured	`len/100`	rolls
50mm sweeping bend (90° heavy duty orange)	`Number` sweeping bends required multiplied by `2`	*`count2`**	each
LABOUR
Labour	Allowing for `10 minutes of Labour` for every metre measured as per the Labour Conversion Chart	*`count0.17`**	hours

Airconditioning

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

Part	Explanation	Formula	UMO
Room areas	How many `metres squared` for each room measured	`area`	m2
KW rating	Area measured multiplied by `150 wattage per m2` and to convert to a KW rating, divided by `1000`	*`area150/1000`**	KW
Volume of air	The area measured multiplied by `2.7m ceiling height`	*`area2.7`**	m3

Learn more about how to view individual KW ratings quantities when exporting by clicking here.

To show individual Area KW Ratings, lock the breakdown to display on Export. It is recommended to rename the areas within the stage to display the location.

From the Quantities Tab, click + on the Part / Labour line with the breakdown
Click + next to KW Rating and click the Padlock

Click Export and select Export as CSV
Choose the Export format
View the breakdown in the Notes Column or for Group by Measurement, the breakdown will appear in the Description Column
Click Download Export then open

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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