# The Electricity Supply Regulations 1988, Paragraph 4


A safety sign may include additional text the letters of which shall be shown in black and shall have the same proportions as the letters shown in the diagram below.

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Source: https://www.legislation.gov.uk/uksi/1988/1057/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/electricity-supply-regulations-1988/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.