IEC 60079-6:20 15规定了用于爆炸性气体环境的防爆设备和防爆组件的设计、构造、测试和标记要求，其防护液浸没类型为“o”。保护液浸没类型“o”的防爆设备和防爆部件为: -保护级别“ob”(EPL“Mb”或“Gb”)或 -保护级别“oc”(EPL“Gc”)。对于保护等级“ob”，本标准适用于额定电压不超过11 kV r.m.s。a.c.或者华盛顿。对于保护级别“oc”，本标准适用于额定电压不超过15 kV r.m.s。a.c.或者华盛顿。本标准对IEC 60079-0的一般要求进行了补充和修改。当本标准的要求与IEC 60079-0的要求相冲突时，以本标准的要求为准。第四版取消并取代了2007年出版的第三版。本版构成技术修订版。与上一版相比的重大变化是: -第4版是对油浸“o”要求的重大技术修订，应被视为引入了所有新要求。由于这个原因，没有包括正常的“重大变化表”。特别是: -根据对31/715/DC的答复所建议，将油浸“o”的要求重新定义为液体浸、防护等级“ob”和“oc”； -“ob”和“oc”都增加了保护火花触点的能力。对保护液引入了附加要求。 关键词:防爆设备和防爆组件，防护液浸没类型“o”

IEC 60079-6:2015 specifies the requirements for the design, construction, testing and marking of Ex Equipment and Ex Components with type of protection liquid immersion "o" intended for use in explosive gas atmospheres. Ex Equipment and Ex Components of type of protection liquid immersion "o" are either:
- Level of Protection "ob" (EPL "Mb" or "Gb") or
- Level of Protection "oc" (EPL "Gc"). For Level of Protection "ob", this standard applies where the rated voltage does not exceed 11 kV r.m.s. a.c. or d.c. For Level of Protection "oc", this standard applies where the rated voltage does not exceed 15 kV r.m.s. a.c. or d.c. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. This fourth edition cancels and replaces the third edition, published in 2007. This edition constitutes a technical revision. The significant changes with respect to the previous edition are:
- Edition 4 represents a major technical revision of the requirements for oil immersion "o" and should be considered as introducing all new requirements. The normal "Table of Significant Changes" has not been included for this reason. In particular:
- The requirements for oil immersion "o" have been redefined into liquid immersion, levels of protection "ob" and "oc" as recommended by the responses to 31/715/DC;
- The ability to protect sparking contacts has been added to both "ob" and "oc". Additional requirements have been introduced for the protective liquid. Keywords: Ex Equipment and Ex Components with type of protection liquid immersion "o"