Oil-immersion is typically used for heavy duty transformers and switchgears.
Standards #
| Current constructional standards | |
| IEC 60079-6: 2007 BS EN60079-6: 2007 | Explosive Atmospheres – Part 6: Equipment Protection by Oil Immersion, “o” |
| Older standards | |
| BS EN50015: 2005 | Oil immersion ‘o’ |
| BS 5501-2: 1977 | Oil immersion ‘o’ |
| Codes of Practice | |
| BS 5354: Part 9: 1979 (Withdrawn) | Installation and maintenance requirements for electrical equipment with type of protection ‘o’ oil-immersed equipment |
Note:
Since IEC/EN60079-14 and IEC/EN60079-17 do not provide selection, installation, inspection and maintenance requirements for oil-immersed equipment, BS 5345: Part 9 remains a useful reference for guidance, for the UK.
Oil immersed, equipment shall be installed in accordance with manufacturer’s documentation.
It is expected that installation details for oil filled equipment will be included in the next edition.
Definition #
The definition for this type of protection is:
‘A type of protection in which the electrical equipment or parts of the electrical equipment are immersed in protective liquid in such a way that an explosive gas atmosphere which may be above the liquid or outside the enclosure, cannot be ignited.’
Zones of Use : 1& 2 #
Levels of protection : Ex “ob” and Ex “oc” #
