Ex-pert Electrical Technologies

Dynamic elaboration on the Art & Science of Hazardous Area Protection

Oil Immersion

Name of the Protection Technique: Oil Immersion

Symbol: o

Oil Immersion

Electrical equipment or parts of electrical equipment are completely immersed in a protective fluid (e.g. oil) in such a way that a potentially explosive atmosphere existing above the surface or outside of the encapsulation cannot be ignited

Main Application:                                Transformers, starting resistors

Type of Ignition Protection Abbreviation Region Classification  Specification/Standard
Oil Immersion AEx o US Class I, Zone 1 ISA 60079-6
Oil Immersion Ex o CA Class I, Zone 1 CSA E79-6
Oil Immersion Ex o (EEx o) EU Zone 1 EN 50015
Oil Immersion Ex o IEC Zone 1 IEC 60079-6

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