(a) where it is supported by only a single rope or attachment point, has the safety catches and mechanisms required in section 219,

(b) except on any side that has a door, is enclosed by sheet steel at least three millimetres thick or material equivalent in strength,

(c) has a hood of steel plate at least five millimetres thick or material equivalent in strength,

(d) has a door or doors as required in section 218,

(e) has an internal height greater than 2.1 m,

(f) has a clearance at the door that is greater than 1.8 m, and

(g) where practical, has an exit in the roof that can be opened from inside or outside the cage.