Paragraph 20 I1 United Kingdom Measures relating to equipment and protective systems intended for use in potentially explosive atmospheres M1. Annotations Marginal citations M1 S.I. 1995/751. Commencement I1 Sch. para. 20 in force at 22.3.2019, see reg. 1 ← Paragraph 19 Paragraph 20 Paragraph 21 →