14 Rockwell Automation Publication 440R-UM013F-EN-P - July 2021
Chapter 2 Installation
Spacing
You can mount safety relays directly next to other safety relays. When using
the EtherNet/IP™ module, you must mount the safety relay within 10mm
(0.4 in.) of the neighboring module to maintain effective communication.
Maintain a space of 50.8 mm (2 in.) above, below, and in front of the relay for
adequate ventilation.
Removable Terminals Safety relays have removable terminals to ease wiring and replacement.
Figure 4 - Removable Terminals
1. Insert the tip of a small screwdriver into the slot near the terminal
screws.
2. To unlock the terminal block, rotate the screwdriver.
You can now remove the terminal block from the housing.
Enclosure Considerations Most applications require installation in an industrial enclosure to reduce the
effects of electrical interference and environmental exposure. Pollution
Degree2 is an environment where normally only non-conductive pollution
occurs with the expectation that condensation causes occasional temporary
conductivity. Overvoltage 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 insulation.
This equipment is intended for use in a Pollution Degree 2 industrial
environment, in overvoltage Category II applications (as defined in
IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating. This
equipment is considered Group 1, Class A industrial equipment according to
IEC/CISPR 11. Without appropriate precautions, there can be difficulties with
electromagnetic compatibility in residential and other environments due to
conducted and radiated disturbances.
This equipment is supplied as open-type equipment. The relays must be
mounted within an enclosure that is suitably designed for those specific
environmental conditions that are present and appropriately designed to help
prevent personal injury as a result of accessibility to live parts. The enclosure
must have suitable flame-retardant properties to help prevent or minimize the
spread of flame, in compliance with a flame spread rating of 5VA, V2, V1, V0 (or
equivalent) if non-metallic. The interior of the enclosure must be accessible
only by the use of a tool. Subsequent sections of this publication contain
additional information regarding specific enclosure-type ratings that are
required to comply with certain product safety certifications.
For more information, see:
• Industrial Automation Wiring and Grounding Guidelines, publication
1770-4.1
, for additional installation requirements.
• NEMA Standard 250 and IEC 60529, as applicable, for explanations of the
degrees of protection provided by different types of enclosure.
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