3408/3410/3412 Series Industrial PC System Manual
52
Warning - Explosion Hazard
When operating in hazardous locations, disconnect power before re-
placing or wiring modules.
Warning
To maintain a safe condition, do
not
use an external keyboard or mouse
when the unit is operating in a hazardous environment.
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). They are not complete and are included here as a general description
for those not familiar with generic hazardous location requirements.
People responsible for installing 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
Division 1 locations are those in which flammable or ignitable gases, vapors, or combus-
tible dusts and particles can exist due to the following conditions:
•
Normal operating conditions.
•
Because of repair, maintenance conditions, leakage, or where mechanical failure or
abnormal operation of machinery or equipment might release or cause explosive or
ignitable mixtures to be released or produced.
•
Combustible dusts of an electrically conductive nature may be present in hazardous
quantities.
Note
Xycom Automation systems are not suitable for installation within Divi-
sion 1 locations.
