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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) |