14 Rockwell Automation Publication 440R-UM013G-EN-P - December 2022
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 safety 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 safety 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 publications:
• 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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