John Michael Williams says...

Actually, a former maritime safety engineer Emailed me
about this. However, he could not locate the law or regulation
which defines "intrinsic safety". If you can find a law
or regulation governing operation of a transmitter around
a gas pump, please post it.


The National Fire Protection Association’s (NFPA) National Electrical
Code (Article 500, NFPA 70) defines Hazardous Locations as those areas
"where fire or explosion hazards may exist due to flammable gases or
vapors, flammable liquids, combustible dust, or ignitable fibers or
flyings."

NFPA-NEC Intrinsic Safety ratings detail the specific Hazardous
Location in which an electrical device can be used without fear
of electrostatic discharge that may cause an explosion. The
classification that applies to auto fuels a Class I: Gases,
vapors and liquids - Group D: Hydrocarbons, fuels, solvents,
etc. - Division II: Not normally present in explosive concentrations
(but may accidentally exist).

Other standards that apply to Intrinsic Safety a


ANSI/UL 913 Intrinsically Safe Apparatus and
Associated Apparatus for Use in Class I, II, and III,
Division 1, Hazardous (Classified) Locations

US Mine Safety and Health Administration (MSHA)
Mine Wide Monitoring Systems (MWMS) Program:
MSHA ACRI2001 - 30 CFR Part 18, Part 23

CENELEC/EN European Standards for electrical
apparatus for potential explosive atmosphere
General requirements EN 500 14 [IEC 60079-0]
Increased safety "e" EN 500 19
Intrinsic safety "i" EN 500 20 [IEC 60079-11] [BS 5501 part 7]

Canadian Standards Association (CSA) C22.2 No. 157-92

ANSI/ISA RP 12.6 Wiring Practices for Hazardous (Classified)
Locations Instrumentation - Part 1: Intrinsic Safety

Factory Mutual Research Corporation (FMRC)?

American Society for Testing and Materials (ASTM)?


Also see:

http://www.crouse-hinds.com/CrouseHi...afe/insafe.cfm
http://www.ascojoucomatic.com/images...f1/V1005gb.pdf
http://www.mtlnh.com/datashts/sensors/Sen%20Specs.pdf
http://www.msha.gov/S&HINFO/TECHRPT/...ICAL/imisf.pdf
http://www.gexcon.com/index.php?src=...HBcontents.htm
http://www.electrona.se/pdf/tp_1110_3.pdf
http://www.ieee-pcic.org/archive/pcic98.pdf





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Guy Macon, Electronics Engineer & Project Manager for hire.
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