Occupational Health and Safety Code

The Occupational Health and Safety Code provides specific technical health and safety rules and requirements for Alberta workplaces.

Alberta Regulation 191/2021

Part 39 Tree Care Operations






This Part applies to arboriculture activities that involve pruning, repairing, maintaining or removing trees or cutting brush if a worker works at height and depends on the tree for support.


Safe work practices



An employer must develop and implement safe work practices and procedures that include

(a) the assessment of hazards at the work site,

(b) worker training, including hazard recognition,

(c) the selection, limitation, operation and maintenance of equipment and personal protective equipment,

(d) the use of work positioning systems and fall protection systems, and

(e) emergency rescue.


If reasonably practicable, an employer must involve affected workers in the development and implementation of the safe work practices and procedures.


Fall protection and work positioning



If it is not reasonably practicable to comply with the fall protection requirements of section 139, an employer must ensure that a worker uses a work positioning system.


A worker must use or wear the work positioning or fall protection system the employer requires the worker to use or wear.


Harness standards



An employer must ensure that a harness manufactured on or after March 31, 2023 and used as part of a work positioning system is approved to

(a) NFPA Standard 1983, Standard on Fire Service Life Safety Rope and System Components, 2006 Edition, as a Class II or Class III life safety harness,

(b) CEN Standard EN 813: 1997, Personal protective equipment for prevention of falls from a height — Sit harnesses,

(c) CSA Standard Z259.10-18, Full body harnesses,

(d) ANSI/ASSE Standard Z359.1‑2007, Safety requirements for personal fall arrest systems, subsystems and components, or

(e) CEN Standard EN 361: 2007, Personal protective equipment against falls from a height — Full body harnesses.


Subsection (1) does not apply to harnesses in use before April 30, 2004.


Knot exemption



Section 150.3 does not apply to arboriculture activities to which this Part applies.