# The Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres Regulations 2016, Paragraph 21: Hazards arising from external effects

Extent: E+W+S

(1) Equipment and protective systems must be so designed and constructed as to be capable of performing their intended function in full safety, even in changing environmental conditions and in the presence of extraneous voltages, humidity, vibrations, contamination and other external effects, taking into account the limits of the operating conditions established by the manufacturer.
(2) Equipment parts used must be appropriate to the intended mechanical and thermal stresses and capable of withstanding attack by existing or foreseeable aggressive substances.

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Source: https://www.legislation.gov.uk/uksi/2016/1107/schedule/1/paragraph/21 (the official version)
Page: https://openlegislation.uk/equipment-and-protective-systems-intended-for-use-in-potentially-explosive-atmospheres-regulations-2016/schedule-1/paragraph-21
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.