123An employer shall ensure that a wooden portable ladder
(a)
is made of No. 1 grade or better spruce or fir,
(b)
is not painted other than by being preserved with a transparent protective coating,
(c)
if a single ladder, does not exceed 6 m in length,
(d)
has rungs
(i)
free of knots,
(ii)
designed to carry a load of 200 kg placed at the centre,
(iii)
uniformly spaced with a maximum rise of 300 mm,
(iv)
secured to each side of the side rail of the ladder by at least three screws or barbed nails of adequate length or by attachments giving equivalent or better strength, and
(v)
notched into the side rails of the ladder at least 13 mm on the lower side or with fillers installed between the rungs, and
(e)
has side rails
(i)
dressed on all sides and without sharp edges, and
(ii)
with a uniform clear width between them of not less than 300 mm for ladders 3 m in length or less, and increasing 1 mm in width for each 100 mm in excess of 3 m.