3700 Series Flat Panel Industrial PC
Chapter 2 – Installation
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143311 (H)
Definitions
The following Class and Division explanations are derived from Article 500
(Sections 5 and 6) of the United States National Fire Protection Agency National
Electric Code (NFPA 70, 1990). The definitions are not complete and are included
here only for a general description for those not familiar with generic Hazardous
Locations' requirements.
Persons responsible for the installation of this equipment in Hazardous Locations
are responsible for ensuring that all relevant codes and regulations related to
location rating, enclosure, and wiring are met.
Class I Locations
Class I locations are those in which flammable gases or vapors are, or may be,
present in the air in quantities sufficient to produce explosive or ignitable
mixtures.
Class II Locations
Class II locations are those that are or may become hazardous because of the
presence of combustible dust.
Division 1 Locations
A Division 1 location is one in which flammable or ignitable gasses, vapors, or
combustible dusts and particles can exist due the following conditions:
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Normal operating conditions;
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Because of repair, maintenance conditions, leakage, or mechanical
failure or abnormal operation of machinery or equipment; or
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Combustible dusts of an electrically conductive nature may be present in
hazardous quantities.
Note
Pro-face systems are not suitable for installation within Division 1 locations.
Note
Electrical equipment cannot be installed in Division 1 locations unless they are
intrinsically safe, installed inside approved explosion-proof enclosures, or
installed inside approved purged and pressurized enclosures.
Division 2 Locations
Division 2 locations are listed below:
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Class I volatile flammable liquids or flammable gasses are handled,
processed, or used, but confined within closed containers or closed
systems from which they can escape only in cases of accidental rupture
or breakdown of such enclosures or systems, or in case of abnormal
operation of equipment.
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