Rockwell Automation 1790P-T4T0 CompactBlock LDX I/O Thermocouple Modules - Manual (Page 16)

Publication 1790-UM003A-EN-P - May 2002
2-2 Installation and Wiring
General Considerations The modules are suitable for use in a commercial or light industrial
environment when installed in accordance with these instructions.
Specifically, this equipment is intended for use in clean, dry
environments (Pollution degree 2
(1)
) and to circuits not exceeding
Over Voltage Category II
(2)
(IEC 60664-1)
(3)
.
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B,
C, D or non-hazardous locations only. The following WARNING
statement applies to use in hazardous locations.
(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that
occasionally a temporary conductivity caused by condensation shall be expected.
(2) Over Voltage Category II is the load level section of the electrical distribution system. At this level transient
voltages are controlled and do not exceed the impulse voltage capability of the product’s insulation.
(3)
Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC)
designations.
WARNING
!
EXPLOSION HAZARD
• Substitution of components may impair suitability
for Class I, Division 2.
• Do not replace components or disconnect
equipment unless power has been switched off or
the area is known to be non-hazardous.
• Do not connect or disconnect components unless
power has been switched off or the area is known
to be non-hazardous.
• This product must be installed in an enclosure.
• All wiring must comply with N.E.C. article 501-4(b).