MSC.1-CIRC.1557-REV.1-RevisedHazardousAreaClassification(ApplicationOfSolasRegulationIi-145.11)

INTERNATIONALEMARITIMEORGANIZATION4 ALBERT EMBANKMENTLONDON SE1 7SRTelephone:+44(0)2077357611Fax:+44(0)2075873210MSC.1/Circ.1557/Rev.15 September 2023REVISED HAZARDOUS AREA CLASSIFICATION(APPLICATION OF SOLAS REGULATION II-1/45.11)1 The Maritime Safety Committee,at its ninety-seventh session (21 to25 November 2016),with a view to providing more specific guidance on hazardous areaclassification,having considered paragraph 12.32 of the report of the Sub-Committee on ShipsSystems and Equipment(SSE 3/16)to the Committee,approved criteria for the application ofSOLAS regulation Il-1/45.11,as contained in Hazardous area classification (application ofSOLAS regulation lI-1/45.11)(MSC.1/Circ.1557).The Maritime Safety Committee,at its 107th session (31 May to 9 June 2023).approved draft amendments to the aforementioned guidance (MSC.1/Circ.1557)in order toaddress inconsistencies between the standard IEC 60092-502 published by the InternationalElectrotechnical Commission (IEC)and relevant IMO instruments,prepared by theSub-Committee on Ship Systems and Equipment,at its ninth session (27 Februaryto 3 March 2023),for circulation of the Revised Guidance as MSC.1/Circ.1557/Rev.1,as setout in the annex.3 Member States are invited to use the annexed Revised Guidance when applyingSOLAS regulation ll-1/45.11 to hazardous areas on board ships constructed on orafter 1 October 2023,and to bring this Revised Guidance to the attention of all partiesconcerned.This circular supersedes MSC.1/Circ.1557.I:CIRC/MSC1MSC.1-Circ.1557-Rev.1.docxIMOMARPOL AT 50