EPC School

This First Place Awarded Eassy is placed at the following path:

Link

Any further suggestions are welcome. Also comment the new technologies here not mentioned in the paper.

What is Purging?
Purging/pressurization systems permit the safe operation of electrical/electronic equipment under hazardous conditions when approved hazardous location equipment is not part of the application or the equipment
is rated but to a lesser hazardous location than is present.Purging is defined as a process of supplying a flow of clean air or an inert gas to the inside of an enclosure or motor to reduce hazardous internal airborne impurities to an acceptable safe level.

Which are the standards which describe the Purging Principals?
There are a few standards regarding purge and pressurization. Within North
America these are:
• NFPA 70 – National Electrical Code, Article 500
• NFPA 496 – Purged and Pressurized Enclosures for Electrical Equipment 1996 Edition
• ISA 12.4-1996 -- Pressurized Enclosures
• UL 698 – Industrial Control Equipment for use in Hazardous Locations, Class I, Gr. A, B, C, D and Class II, Gr. E, F, G
• CSA C22.1 Part 1 – Canadian Electrical Code

In Europe the following standards are to be considered:
• IEC 79-2
• EN 50016