Burial Depths

Calculate minimum burial depths based on the Canadian Electrical Code. The results are measured from finished grade to the top of your conduits/cables. Caution tape should be layed in the trench at half the buried distance.

step 1

Select the level of protection you will be using.

not protected

Typical selection for vinyl coated wire such as NMWU.

Armoured Cable

Selection for aluminum or steel sheathed wire such as TECK cable.

In Conduit

Selection for wire pulled through conduit or pipe such as PVC or DB2.

step 2

Select whether vehicles will be driving over your trench area.

Vehicular Traffic

Vehicles will travel over top the burried conduit/cables.

Non-Vehicular Traffic

Vehicles will not travel over top the burried conduit/cables.

step 3

Select the voltage range of your cable runs.

750 Volt or Less

Phase to phase voltage (3 phase) or phase to neutral voltage (single phase) will be 750 volts or less.

Over 750 Volt

Phase to phase voltage (3 phase) or phase to neutral voltage (single phase) will be over 750 volts.

step 4

Select if you will be using any extra protection methods.


No extra protection will be used.

Mechanical Protection

Mechanical protection can consist of >= 38mm treated plank, >= 50mm poured concrete, or other suitable material.  Protection material must extend 50mm past width of conductors.

Rock Encased

Rock encased no less than 150mm deep and grouted over to be flush with rock.

Under Concrete Slab

Under >= 100mm concrete slab, in raceway, adequately marked, not subject to damage.


Calculated results based on selections.



Minimum burial depth in millimeters.



Minimum burial depth in inches.