Definitions; Class I Locations; Class Ii Locations; Division 1 Locations - Xycom 3600 Series 3612T User Manual

3600 Series Flat Panel Industrial PC
When in Hazardous Locations, turn off power before replacing or wiring
modules.
Dans les situations hasardees, couper la courant avant de remplacer ou de
cabler les modules.
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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). They 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 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 are those that are, or may become, hazardous because of the
presence of combustible dust.
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A Division 1 location is one in which flammable or ignitable gasses, vapors, or
combustible dusts and particles can exist due the following conditions:
Normal operating conditions;
• • • •
Because of repair, maintenance conditions, leakage, or mechanical failure or
• • • •
abnormal operation of machinery or equipment; or
Combustible dusts of an electrically conductive nature may be present in
• • • •
hazardous quantities.
Xycom Automation systems are not suitable for installation within Division 1
locations.
Warning – Explosion Hazard
Avertissement – Risque d'Explosion
32
Note
Chapter 2 – Installation
142214 (F)