# The Coal and Other Mines (Safety-Lamps and Lighting) Order 1956, Paragraph 19


(1) Subject to the following provisions of this regulation and to the provisions of the Coal and Other Mines (Electricity) Regulations, 1956, an electric lighting unit operated by a generator enclosed in the unit and driven by compressed air, being a unit of a type approved by the Minister, is hereby authorised to be used in mines in which the use of lamps or lights, other than permitted lights, is unlawful (either throughout or in any part), and accordingly such a unit is a permitted light in those mines.
(2) No person shall below ground in any such mine turn on the air pressure in such a unit unless the unit is fully assembled and closed, or open any such unit unless the air pressure has been turned off.
(3) No person shall attempt to use below ground in such a mine any such unit any part of which is defective.
(4) No person other than a person appointed in writing by the manager so to do shall dismantle, repair, alter or adjust any such unit below ground in such a mine.
(5) It shall be the duty of the manager to ensure that at intervals not exceeding three months every such unit is cleaned, thoroughly overhauled and tested in a workshop appointed by the manager for that purpose. The person by whom such a test is made shall forthwith make a full and accurate report thereon in a book provided for that purpose by the owner of the mine.

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Source: https://www.legislation.gov.uk/uksi/1956/1765/schedule/FIRST/paragraph/19 (the official version)
Page: https://openlegislation.uk/coal-and-other-mines-safety-lamps-and-lighting-order-1956/schedule-FIRST/paragraph-19
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.