A worker must ensure, so far as is reasonably practicable, that the worker does not carry out work in the roof space of a building, or enter the roof space for the carrying out of work in another part of the building, unless—
(a) the relevant electrical installation for the building is de-energised; or
(b) a circumstance mentioned in section 120C (2) applies.
Penalty—Maximum penalty—10 penalty units.