Introduction #
Electrical equipment may be manufactured with more than one method of explosion protection. Equipment of this type has combined methods of protection but may also be known as a hybrid.
This approach combines the best features of each type of protection in to one piece of equipment, for both economic and practical purposes.
Hybrid equipment may be constructed using any combination of the various methods of explosion protection and the equipment will be marked with the symbolic letters and construction standard numbers relative to the types of explosion protection used.
Probably the most commonly used combination uses ‘d’ and ‘e’ types of equipment, and the table below shows current and older standards for these only.
Hybrid equipment must also be installed and maintained in accordance with the relevant standards.
Standards #
| IEC & BS EN60079-1: 2014 | Flameproof enclosures ‘d’ |
| IEC & BS EN60079-7: 2015 | Increased safety enclosure ‘e’ |
| IEC60079-0: Ed.6: 2011 BS EN60079-0: Ed.6: 2012 | Explosive atmospheres – Part 0: Equipment – General requirements |
| IEC60079-14: 2013 BS EN60079-14: 2014 | Electrical equipment for explosive gas atmospheres: Part 14. Electrical installations in hazardous areas (other than mines) |
| IEC60079-14: 2013 BS EN60079-17: 2014 | Electrical equipment for explosive gas atmospheres: Part 17. Inspection and maintenance of electrical installations in hazardous areas (other than mines) |
