# The Merchant Shipping (Submersible Craft Construction and Survey) Regulations 1981, Paragraph 2: Power


(2.1) Manned submersible craft shall be:—
(2.1.1) provided with:
(a) a source of power capable of maintaining normal services for a period adequate for the service envisaged and including the minimum life support requirements set out in paragraph 5 of this Schedule;
(b) an emergency source of power capable of providing continuity of communications for the minimum life support requirements set out in paragraph 5 of this Schedule;
(2.1.2) equipped with means of propulsion adequate for the service envisaged.
(2.2) Where electrical power is used the craft shall be:—
(2.2.1) fitted with equipment compatible with the special conditions pertaining to marine service. Where practicable, all equipment shall be continuously rated;
(2.2.2) provided with adequate electrical protection;
(2.2.3) fitted with an effective means of isolating all poles or phases from every circuit and sub-circuit as may be necessary to minimise shock hazard;
(2.2.4) fitted with gas control safeguards, where applicable, on the compartments containing the power source;
(2.2.5) equipped with a pressure compensation device for the power source if it is external to the pressure hull and is subjected to ambient sea pressure;
(2.2.6) fitted with circuits which do not use hull return;
(2.2.7) provided with an earth leakage measuring device.

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Source: https://www.legislation.gov.uk/uksi/1981/1098/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/merchant-shipping-submersible-craft-construction-and-survey-regulations-1981/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.