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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)|