BS EN 60079-11:2007 specifies the construction and testing of intrinsically safe apparatus intended for use in an explosive gas atmosphere and for associated apparatus, which is intended for connection to intrinsically safe circuits which enter such atmospheres.

This type of protection is applicable to electrical apparatus in which the electrical circuits themselves are incapable of causing an explosion in the surrounding explosive atmospheres.

BS EN 60079-11:2007 is also applicable to electrical apparatus or parts of electrical apparatus located outside the explosive gas atmosphere or protected by another type of protection listed in IEC 60079-0, where the intrinsic safety of the electrical circuits in the explosive gas atmosphere may depend upon the design and construction of such electrical apparatus or parts of such electrical apparatus. The electrical circuits exposed to the explosive gas atmosphere are evaluated for use in such an atmosphere by applying this standard.

The requirements for intrinsically safe systems are provided in IEC 60079-25. The requirements for intrinsically safe concepts for fieldbus are provided in IEC 60079-27.

BS EN 60079-11:2007 supplements and modifies the general requirements of IEC 60079-0, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard shall take precedence.

If associated apparatus is placed in the explosive gas atmosphere, it must be protected by an appropriate type of protection listed in IEC 60079-0, and then the requirements of that method of protection together with the relevant parts of IEC 60079-0 also apply to the associated apparatus.



Cross References:
IEC 60079-0:2004
IEC 60079-7
IEC 60079-25
IEC 60079-27
IEC 60085
IEC 60112
IEC 60127
IEC 60317-3
IEC 60317-7
IEC 60317-8
IEC 60317-13
IEC 60529
IEC 60664-1:2002
IEC 60664-1:2002/AMD 1:2000
IEC 60664-1:2002/AMD 2:2002
IEC 60664-3:2003
ANSI/UL 248-1
EN 60079-0:2006
EN 60079-7:2007
EN 60079-25:2004
EN 60079-25:2004/Corrigendum:2006
EN 60079-27:2006
EN 60085:2004
EN 60112:2003
EN 60127
EN 60317-7:1994
EN 60317-8:1994
EN 60317-13:1994
EN 60529:1991
EN 60529:1991/Corrigendum:1993
EN 60664-1:2003
EN 60664-3:2003
IEC 60050-426:1990
IEC 60079-15
EN 60079-15:2005
IEC 61086-1:2004
EN 61086-1:2004
IPC 2152
94/9/EC


Replaces BS EN 50020:2002 which remains current.