5015T Flat Panel Industrial Monitor Chapter 2 Installation
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142029 (D)
NOTE
Xycom Automation 5015T, 5015T-24V 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
•
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.
•
Ignitable concentrations of Class I vapors or gasses are normally prevented by
positive mechanical ventilation, but which may become hazardous due to mechanical
failure of those ventilation systems.
•
Location is adjacent to a Division 1 location.
•
Class II combustible dust is not normally in the air in quantities sufficient to produce
explosive or ignitable mixtures. Dust accumulations are normally insufficient to
interfere with normal operation of electrical equipment or other apparatus.
Combustible dust may be in suspension in the air as a result of the following:
infrequent malfunctioning of handling or processing equipment; combustible dust
accumulations on, or in the vicinity of electrical equipment; may be ignitable by
abnormal operation or failure of electrical equipment.
Groups
All electrical equipment that is approved for use in hazardous locations must include a
group rating. Various flammable and combustible substances are divided into these
groups as a function of their individual maximum experimental safe gap (MESG),
explosion pressure, and ignition temperature.
Component temperatures and the potential for spark based upon voltage, current, and
circuit characteristics, within electrical equipment, will determine what the equipment
group rating will be. A device approved for installation within Class I, Group A locations
may also be used in Groups B, C, or D.
NOTE:
Approved Class I equipment may not be suitable for Class II installations. Class I
includes Groups A, B, C, and D. Class II includes Groups F, and G.
Power Switch
The systems do not have a power switch. The amount of input power required by these
systems classifies a power switch as an incendiary device because the voltage and current
across the make/break device are capable of creating a spark.
Hazardous locations’ regulations require that a power switch rated for ordinary locations
may be used if it is located in an area specified as non-hazardous. However, limits in
