(1) Every hoist or lift shall be of good mechanical construction, sound material and adequate strength, and shall be properly maintained.

(2) Every hoistway or liftway shall be completely enclosed with fire-resisting materials, and all means of access to the hoist or lift shall be fitted with doors of fire-resisting materials:

Provided that any such hoistway or liftway shall be enclosed at the top only by some material easily broken by fire, or be provided with a vent at the top.

(3) For the purposes of this section no lifting machine or appliance shall be deemed to be a hoist or lift unless it has a platform or cage whose direction of movement is restricted by a guide or guides.