IEC 60079-6-2015 pdf download.Explosive atmospheres – Part 6: Equipment protection by liquid immersion “o”.
This part of IEC 60079 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”)
• Level of Protection “oc” (EPL “Gc”)
For Level of Protection “ob”, this standard applies where the rated voltage does not exceed 1 1 kV r.m.s. a.c. or d.c.
For Level of Protection “oc”, this standard applies where the rated voltage does not exceed 1 5 kV r.m.s. a.c. or d.c.
NOTE Requirements for higher voltages are under consideration.
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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60079-0, Explosive Atmospheres – Part 0: Equipment – General requirements
IEC 601 56, Insulating liquids – Determination of the breakdown voltage at power frequency – Test method
IEC 60247, Insulating liquids – Measurement of relative permittivity, dielectric dissipation factor (tan δ) and d.c. resistivity
IEC 60296, Fluids for electrotechnical applications – Unused mineral insulating oils for transformers and switchgear
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 6081 4, Insulating liquids – Oil impregnated paper and pressboard – Determination of water by automatic coulometric Karl Fischer titration
IEC 60836, Specifications for unused silicone insulating liquids for electrotechnical purposes
IEC 61 099, Insulating liquids – Specifications for unused synthetic organic esters for electrical
purposes
IEC 61 1 25, Unused hydrocarbon based insulating liquids – Test methods for evaluating the
oxidation stability
IEC 62021 -1 , Insulating liquids – Determination of acidity – Part 1: Automatic potentiometric
titration
IEC 62535, Insulating liquids – Test method for detection of potentially corrosive sulphur in
used and unused insulating oil
ISO 2592, Determination of flash and fire points – Cleveland open cup method
ISO 271 9, Determination of flash point – Pensky-Martens closed cup method
ISO 301 6, Petroleum oils – Determination of pour point
ISO 31 04, Petroleum products – Transparent and opaque liquids – Determination of kinematic
viscosity and calculation of dynamic viscosity
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60079-0 and the following apply.
3.1 liquid immersion “o”
type of protection in which the electrical equipment or parts of the electrical equipment are immersed in a protective liquid in such a way that an explosive gas atmosphere which may be above the liquid or outside the enclosure cannot be ignited
3.2 protective liquid
liquid which prevents the explosive atmosphere from making direct contact with potential ignition sources
3.3 sealed equipment
equipment designed and constructed in such a manner as to prevent ingress of an external atmosphere during the expansion and contraction of the internally contained liquid during normal operation, for example, by means of an expansion vessel
3.4 non-sealed equipment
equipment designed and constructed in such a manner as to allow the ingress and egress of an external atmosphere during the expansion and contraction of the internally contained fluid during normal operation
3.5 maximum permissible protective liquid level
maximum level that the protective liquid can attain in normal service, taking into account the effects of expansion from the worst-case filling condition specified by the manufacturer to the condition of full load at maximum ambient temperature for which the equipment is designed.IEC 60079-6 pdf download.