IEC 61241-11:2005
Electrical apparatus for use in the presence of combustible dust - Part 11: Protection by intrinsic safety 'iD'

Standard No.

IEC 61241-11:2005

Release Date

2005

Published By

International Electrotechnical Commission (IEC)

Status

Withdraw

Replace By

IEC 61241-11:2005/COR1:2006

Latest

IEC 61241-11:2005/COR1:2006

Scope

This part of IEC 61241 specifies requirements for the construction and testing of intrinsically safe apparatus intended for use in potentially explosive dust cloud or dust layer environments and for associated apparatus that is intended for connection to intrinsically safe circuits which enter such environments. This standard supplements the general requirements of IEC 61241-0: except as indicated in the following list. Apparatus utilized in systems will meet the requirements of IEC 60079-25. If associated apparatus is protected by a type of protection listed in IEC 61241-0 or IEC 60079-0 then the requirements of that method of protection together with the relevant parts of IEC 61241 or IEC 60079 also apply to the associated apparatus. The list of exclusions which follows is directly applicable to associated apparatus intended for use in situations where there is no potentially hazardous atmosphere and in other circumstances should be used in combination with the requirements of the other methods of protection. Clause or subclause of IEC 61241-0 Clause excluded for Intrinsically safe apparatus 4.1 General No 4.2 Opening enclosures Yes 4.3 Environmental conditions No 5.1 Maximum surface temperature No 5.2 Maximum surface temperature with respect to dust layers above 50 mm No 6.1.1 Material specification No 6.1.2 Plastic materials No 6.1.3 Verification of compliance No 6.1.4 Thermal endurance No 6.1.5 Electrostatic charges No 6.2.1 Alloys No 6.2.2 Threaded holes Yes 7 Fasteners Yes 8 Interlocking devices Yes 9 Bushings Yes 10 Materials used for cementing No 12 Connection facilities and terminal compartments Yes 13 Connection facilities for earthing or bonding conductors Yes 14 Cable and conduit entries No 15 to 20 Supplementary requirements for certain electrical apparatus No

IEC 61241-11:2005 history

• 1970 IEC 61241-11:2005/COR1:2006 Corrigendum 1 - Electrical apparatus for use in the presence of combustible dust - Part 11: Protection by intrinsic safety "iD"
• 2005 IEC 61241-11:2005 Electrical apparatus for use in the presence of combustible dust - Part 11: Protection by intrinsic safety 'iD'

IEC 61241-11:2005 Electrical apparatus for use in the presence of combustible dust - Part 11: Protection by intrinsic safety 'iD' was changed to IEC 60079-11:2011 Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i".