reg 8 Unforeseen exposure
(1) If an unforeseeable event or an accident likely to result in an abnormal exposure of workers occurs, the employer shall— (a) inform the workers of the occurrence; and (b) until the situation has been restored to normal and the causes of the abnormal exposure eliminated, take the following precautions. (2) The precautions are that— (a) only those workers essential to the carrying out of repairs and other necessary works are to be permitted to work in the affected area; (b) the workers concerned must be provided with, and required to wear, protective clothing and individual respiratory protection equipment; (c) the exposure must not be permanent and must be limited to the minimum time strictly necessary for each worker; and (d) unprotected workers must not be allowed to work in the affected area.