Regulation 18
(1)
No person shall fire any shell unless he has satisfied himself by taking all reasonable precautions that—
(a)
it is in a hole so placed as to be safe for firing and there has been no contravention of the last preceding regulation in connection therewith; and
(b)
measures of a kind directed by the manager of the mine have been taken to ensure that the shell is not ejected in a dangerous manner on firing.
(2)
Unless an inspector by notice served on the manager consents thereto, no person shall fire a shell in any coal face unless the coal has been holed or sheared to a depth greater than the depth of the hole.