# The Coal Mines (Cardox and Hydrox) Regulations 1956, Regulation 16


No person shall connect any external firing wire to any shell at a mine until it is necessary to do so for the purpose of firing the shell.

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Source: https://www.legislation.gov.uk/uksi/1956/1942/regulation/16 (the official version)
Page: https://openlegislation.uk/coal-mines-cardox-and-hydrox-regulations-1956/regulation-16
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.