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Electrical Quantities (cable, conduit, circuits, cable tray)

Choose points or cable tray. For points, enter the light points, sockets and switches, the average cable run per point and how many points one circuit takes: PRAXAO gives the cable for lighting and for sockets with the waste, the conduit, the flush boxes, the circuits and the breakers. For a tray, enter the run length, the bar length and the bracket spacing to get the bars, brackets and covers. All the rates are starting values to replace with the installer’s own. The tool counts quantities: it does not size a cable, a breaker or an earthing.

m
m
%

Waste and cuts (pertes, chutes) — Extra material added for breakage, cuts and offcuts. It is a percentage you set: the usual figure depends on the material and the job.

Result

Circuits

4

Cable for lighting
88 m
Cable for sockets
79.2 m
Conduit, total length
152 m
Flush boxes
28
Breakers in the panel
4

Assumptions

Quantity take-off of a count of points. Cable and breaker sizes, earthing, loads, voltage drop and regulations are the work of a qualified electrician: this is not an electrical design.

Estimated time to carry out the work

  • Duration (days, crew of 2, 8 h a day)1.5
  • Labour (person-hours)16.7

An estimate from usual rates of work on a small site. It changes with the crew’s skill, access, equipment, weather and how the site is organised: not a schedule.

Entered data
Light points
10
Sockets
12
Switches
6
Average cable run per light point
8 m
Average cable run per socket
6 m
Light points per circuit
8
Sockets per circuit
8
Waste and cuts
10 %
Estimated cost

Enter your unit prices and the cost updates as you type. No price is pre-filled or made up.

MaterialQuantityUnit priceAmount
Cable for lighting88 m—
Cable for sockets79.2 m—
Conduit, total length152 m—
Flush boxes28 u—
Breakers in the panel4 u—
Total excl. tax
$0.00
$0.00
Total incl. tax
$0.00

Lines without a price (not in the total): 5

Your prices stay in this browser. Indicative estimate, labour and transport excluded unless you add them.

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Results are provided for information. Check tax rates and legal requirements that apply to you.

How to use it

  1. Choose points or cable tray.
  2. Enter the number of points, or the length of the tray run.
  3. Replace the starting values (average runs, points per circuit, bar length, spacing, waste) with your own.
  4. Read the quantities to buy, then price them in the cost panel.

Examples

Worked example — Points, cable and circuits — Light points 10, Sockets 12, Switches 6

Cable for lighting: 88.00 m · Cable for sockets: 79.20 m · Conduit, total length: 152.00 m · Flush boxes: 28 · Circuits: 4 · Breakers in the panel: 4

Frequently asked questions

Does it size the cables and breakers?

No. Cable sections, breaker ratings, earthing, loads and voltage drop are the work of a qualified electrician and depend on the regulations in force.

How are the circuits counted?

The light points are divided by the number a circuit takes, and so are the sockets, each rounded up; the circuits are the sum. One breaker is counted per circuit.

How are the tray brackets counted?

The run length is divided by the bracket spacing and rounded up, plus one bracket for the end of the run.

Guides to go further

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