# The Coal Mines (Cardox and Hydrox) Regulations 1956, 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.

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Source: https://www.legislation.gov.uk/uksi/1956/1942/regulation/18 (the official version)
Page: https://openlegislation.uk/coal-mines-cardox-and-hydrox-regulations-1956/regulation-18
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.