An employer must not require or permit any person to, and no person shall, enter any place from or into which solid or particulate material is being discharged where a danger exists of a person being engulfed by such solid or particulate material, unless -
- such a person is provided with and properly uses a safety belt and rope;
- at least one other person who has been properly instructed, is and remains in attendance outside such place to keep the persons therein under continuous observation in order to render assistance in case of emergency; and
- the precautions prescribed by these regulations are taken if dangerous gas, fumes, dust or vapour may be present in such a place.