The following IEC Ex standards have been issued at final draft (FDIS) stage. If you buy at this stage you will get the published standard when it is out.
IEC 60079-20-1 Ed. 1.0 (2009-10) Preview Price: CHF 368.00
Explosive Atmospheres – Part 20-1: Material characteristics for gas and vapour classification – Test methods and data
IEC 60079-29-4 Ed. 1.0 (2009-11) Preview Price: CHF 140.00
Explosive atmospheres – Part 29-4: Gas detectors – Performance requirements of open path detectors for flammable gases
The first standard, IEC 60079-20-1, cancels and replaces the first edition of IEC 60079-1-
1(2002), the second edition of IEC 60074-4 (1975), its amendment 1(1995) and its
complement: IEC 60079-4A (1970), the first edition of IEC/TR 60079-12 (1978) and the first
edition of IEC 60079-20 (1996).
The second standard, IEC 60079-29-4, is a new standard on open path detectors for flammable gases.
The standards can be accessed on the IEC website at JUST PUBLISHED [justpub@iec.ch].