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The Canadian Standards Association (CSA) Standard Z11-12 recommends different lengths for different rating (or grades) of step ladders.
|Grade||Description of Grade||Maximum Length|
|1AA||Construction and industrial use; special duty with load rating of 170 kg (375 lbs)||3.6 m (12 ft)|
|1A||Construction and industrial use; extra heavy duty with load rating of 136 kg (300 lbs)||6 m (20 ft)|
|1||Construction and industrial use; heavy duty with load rating of 113 kg (250 lbs)||6 m (20 ft)|
|2||Tradesmen and farm; medium duty with a load rating of 102 kg (225 lbs)||3.6 m (12 ft)|
|3||Household; light duty with load rating of 91 kg (200 lbs)||2 m (6.5 ft)|
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Although every effort is made to ensure the accuracy, currency and completeness of the information, CCOHS does not guarantee, warrant, represent or undertake that the information provided is correct, accurate or current. CCOHS is not liable for any loss, claim, or demand arising directly or indirectly from any use or reliance upon the information.