CAN CSA Z91-2017 Health and safety code for suspended equipment operations.
6 Equipment operation
6.1 Inspection and maintenance records
Before using any suspended equipment or permanently installed support systems, operators shall verify that maintenance or inspection logs, or both, indicate that the system has been subjected to required maintenance or inspections, or both. If the inspection logs are not present or do not indicate that the required maintenance and inspection have been performed, the equipment shall not be used until these requirements can be assured.
6.2 Suspension lines and lifelines
Suspension lines and lifelines shall be handled in such a manner as to prevent damage, abrasion, or kinks. When lines drape to ground level, they shall be protected from damage or entanglement in moving vehicles, machines, or other equipment.
6.2.2 Tie downs
In order to avoid a load that can overstress the lines, suspension lines and vertical lifelines shall not be positively anchored at the base of the building or lower level. If restraining the lines to prevent lateral movement, vertical movement of not less than 1 m (3.3 ft) shall be provided to avoid placing significant additional load on the support system when subjected to wind and operational movements.
Note: When a wire rope is tensioned between two fixed points, any side force from equipment or wind has the potential to induce very high tension in the wire rope, which could overstress the supporting device. Weight con be used to keep the rope under tension provided that the weight is free to rise thereby allowing some lateral displacement of the wire rope when it is subjected to loterolforces.
6.2.3 Vertical suspension
Suspension lines shall be in line with the point of suspension for their entire length unless the support system and suspension lines are designed to allow loads resulting from the angled line work (see Figure 6 and Clause 6.5.5).
Note: Figure B.3 provides requirements for work on a cascading wall condition.
6.2.4 Mechanical means above 90 m (295 ft)
Where the suspension height exceeds 90 m (295 ft), mechanical means (such as a rigging winch, see Figure 7) shall be used to raise or lower the lines or power cords. This requirement does not apply to synthetic lines.CAN CSA Z91 pdf download.