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The Canadian Standards Association (CSA) Standard Z11-18 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) | 6 m (20 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) |
The Canadian Standards Association (CSA) Standard Z11-18 recommends different standing levels, depending on the size of the step ladder. Note that these are the highest levels recommended. Persons should stand lower on the ladder if they feel unstable.
Step ladder size | Recommended highest standing level |
1.22 m (4ft) | 0.58 m (2 ft) |
1.52 m (5 ft) | 0.89 m (3 ft) |
1.83 (6 ft) | 1.17 m (4 ft) |
2.13 (7 ft) | 1.47 m (5 ft) |
2.44 m (8 ft) | 1.78 m (6 ft) |
3.05 m (10 ft) | 2.36 m (8 ft) |
3.66 m (12 ft) | 2.95 m (10 feet) |