Technical Resources
Hazardous Location Videos (.wmv format)
Introduction - Describes the reasons and theory behind how explosions can occur in hazardous areas
Hazardous Classifications - Describes and explains the NEC hazardous location classification system
Hazardous location equipment - Describes how ex-proof equipment works and how to specify equipment based on area classification and devices involved.
NEC Zone system - Describes the Zone system for classifying hazardous areas.
Hazardous Location Documents (.pdf format)
Hazardous Location Training - Provides a comprehensive review of NEC article 500
IEC Area Definitions - Describes the IEC Hazardous location system
IEC Protection Methods - Details the types and differences of protection methods used in the IEC System
IP Ratings - A chart explaining the IEC IP ingress protection methods
NEMA Ratings - A reference for the definitions of the NEMA ingress protection methods
IP vs NEMA Ratings - A cross reference between the two systems.
T- Rating Requirements - Charts detailing the required T-Tratings for all gases
NEC Reference Info & Tables
Article 501-3 - This article from the NEC explains where and when "general duty, non explosion-proof" enclosures can be used in Class I, Division 2 areas.
Conduit Fill - A table showing the number and size of conductors that can be installed in Rigid conduit.
Cable size conversion - A table converting AWG and MCM (circular mill) cable sizes to MM2
