Definitions; Class I Locations; Class Ii Locations; Division 1 Locations - Xycom 4600 Series User Manual

4600 Series Flat Panel Industrial PC
Dans les situations hasardees, couper la courant avant de remplacer ou de
cabler les modules.

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). 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

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:
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.
Pro-face systems are not suitable for installation within Division 1 locations.
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.
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Avertissement – Risque d'Explosion
Note
Note
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Chapter 2 – Installation
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