"This standard specifies the requirements for the construction and testing of oil - immersed electrical equipment@ oil -immersed parts of electrical equipment and Ex components in the type of protection oil immersion ""o""@ intended for use in explosive gas atmospheres. NOTE Type of protection oil immersion ""o"" provides equipment protection level (EPL) Gb. For further information@ see Annex A. This standard supplements and modifies the general requirements of ANSI/ISA-60079-0 Where a requirement of this standard conflicts with a requirement of ANSI/ISA-60079-0 the requirement of this standard takes precedence. This standard is applicable to electrical equipment@ parts of electrical equipment@ and Ex components which@ in the absence of oil immersion@ are not ignition capable in normal operation as determined by ANSI/ISA-60079-15 or ANSI/ISA-60079-11"