Circuit Breaker Utilization Categories (IEC 60947-2)
Utilization category (for a switching device or a fuse) is defined in IEC 60947-1 as the combination of specified requirements related to the conditions in which the switching device or …
IEC 62262 – IK Codes – Impact Protection for Electrical Enclosures
IEC 60529 – Degrees of protection provided by enclosures (IP Code) describes a system for classifying the degrees of protection provided by the enclosures of electrical equipment. The protection provided …
Which Standard Prevails?
I have been involved in many projects wherein specifications and datasheets are required to comply with the local standards. Most of the time, this will create issues during the procurement …
Explosive Atmospheres – ANSI/ISA/UL/NFPA/EIC
In late 2009, the International Society of Automation (ISA) and Underwriters Laboratories Incorporated (UL) jointly issued ANSI/ISA 60079-0 Explosive atmospheres – Part 0: Equipment – General Requirements which is a …
IEC 60364-5-56 Safety Services (Emergency Systems)
Safety service is defined in IEC 60364-5-56 as an electrical system for electrical equipment provided to protect or warn persons in the event of a hazard, or essential to their …
Earth-fault Factor – Importance in Equipment Selection
Power frequency withstand is one of the criteria in the selection of electrical equipment rating. The selection of the appropriate power-frequency withstand level is related to the earth fault factor …