Rockwell Automation Publication 440R-UM012E-EN-P - November 2018 15
Installation Chapter 2
This equipment is supplied as open-type equipment. It 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,
complying 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 may 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,
RockwellAutomation publication 1770-4.1
, for additional installation
requirements.
• NEMA Standard 250 and IEC 60529, as applicable, for explanations of
the degrees of protection that are provided by different types of
enclosure.
Preventing Excessive Heat
For most applications, normal convective cooling keeps the relay within the
specified operating range. Verify that the specified temperature range is
maintained. Proper spacing of components within an enclosure is usually
sufficient for heat dissipation.
In some applications, other equipment inside or outside the enclosure can
produce a substantial amount of heat. In this case, place blower fans inside the
enclosure to help with air circulation and to reduce “hot spots” near the
controller.
Additional GLP safety relay cooling provisions might be necessary when high
ambient temperatures are encountered. Do not bring in unfiltered outside air.
Place the controller in an enclosure to help protect it from a corrosive
atmosphere. Harmful contaminants or dirt could cause improper operation or
damage to components. In extreme cases, you may need air conditioning to
help protect against heat buildup within the enclosure.
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