Monroe Electronics Electrostatic Fieldmeter - Static Monitor - model 177A - Manual (Page 44)

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NOTES for R. Stahl Systems:

Enclosures include mounting rails, insulating standoffs, ground terminals and labels.
 Listed enclosures are Hoffman NEMA-4.
Some National Fire Prevention Association (NFPA) publications dealing with the subject of Intrinsic Safety (IS)
are:
 NFPA 497A - Classification of Class I (Classified) Locations for Electrical Installations in Chemical
Process Areas (pamphlet)

NFPA 497M - Classification of Gases, Vapors and Dusts for Electrical Equipment in Hazardous
(Classified) Locations (pamphlet)

NFPA 493 - Intrinsically Safe Apparatus for Use in Division 1 Hazardous Locations (pamphlet)

NFPA 325M - Fire Hazard Properties of Flammable Liquids, Gases and Volatile Solids (pamphlet)

NFPA 496 - Purged and Pressurized Enclosures for Electrical Equipment (pamphlet)

Electrical Installations in Hazardous Locations by Peter J. Schram and Mark W. Earley - ISBN 0-87765-
356-9 (book)
The above are available from:
National Fire Protection Association
1 Batterymarch Park
PO Box 9101
Quincy, MA 02269-9101
Tel. (800) 344-3555