Canada Occupational Health and Safety Regulations (SOR/86-304)

2.12 (1) Every guardrail shall be highly visible and consist of

• (a) a horizontal top rail not less than 900 mm but not more than 1 100 mm above the base of the guardrail;

• (b) a horizontal intermediate rail spaced midway between the top rail and the base; and

• (c) supporting posts spaced not more than 3 m apart at their centres.

(2) Every guardrail shall be designed to withstand a static load of 890 N applied in any direction at any point on the top rail.