API - American Petroleum Institute, and Introductory Training on API Recommended Practices 500 and 505, Classification of Locations for Electrical Installations at Petroleum Facilities.

ASME - "Better intrinsically safe than sorry" by Greg Paula, Associate Editor. Intrinsically safe devices and systems are becoming more common at sites with a potential for fire and explosion.

ATEX 118a  - Directive:  COMMON POSITION (EC) No 13/1999 adopted by the Council on 22 December 1998

Atlantic Centre for Electrical Technologies - Halifax, Canada. 'Ex Training' which covers the installation and maintenance of electrical equipment in hazardous and potentially explosive environments.

CSA International Hazardous Locations - with information on many topics

DMT/BVS HazLoc page with notes on ATEX, also  EECS ATEX Service.

Dron & Dixon with content such as Ex Tables and notes on ATEX

Epsilon Compliance Limited - including The Epsilon ATEX User Group- ATEX Knowledge Sharing

Ex-INFO Online from PTB

Ex Industries - Hazardous Location Forum  A place to post and review Hazardous Location questions hosted by Ex Industries.

FM wall poster Expert Guide to Hazardous Locations. (Free.)   Also from FM, the publication Approved Product News or download back issue of Approved Product News, Vol 14 No. 3 1998 - In the Zone with FMRC (with article 'Zone Classifications Lower Costs for Hazardous Location Products') from mirror site. (This is an 800k pdf file).

IECEx site describing the Ex Scheme.

IICA (Institute of Instrumentation and Control Australia Inc.) presentation on NATIONAL AND INTERNATIONAL STANDARDISATION by Chris Agius.

Instrument Net Web page.

NEC 2002 expands section 505 for Zones and Methods of Protection. (NEC info. via Mike Holt)

OSHA Guidelines for Electrical Safety in Hazardous Locations and OSHA Requirements for Hazardous Location Electrical & Miscellaneous Equipment.

Strategic Canada has many excellent links such as: Canadian Patent Database. E.g.: DRAINABLE ENCLOSURE FOR EXPLOSION PROOF ELECTRICAL SYSTEMS

Technical Books and Publications, on Hazardous Locations, available from book distributors and publishers.

Technical Papers, especially from IEEE such as:  New area classification guidelines

The Safety Link from International Product Safety News.

UL wall chart & binder size HazLoc educational poster -available in English, Spanish & Portuguese - free.. UL Field assembly of Ex 'e' boxes, UL Certification of Division 2 motor drives,  UL Hazardous Locations page with notes on "converting certificates". Also notes by Paul Kelly: "Defining Hazardous Locations on a global scale..."

Zone Quest glossary of terms from Crouse-Hinds.