56 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017
Electrical Considerations
All racks should be mounted in an appropriate metal enclosure. A diagram that shows recommended
wiring practice for the cabinet enclosure is given in Figure 29 – Cabinet Wiring, Single Chassis, and Figure
30 – Cabinet Wiring, Multiple Chassis. When Redundant power supplies are used in Redundant controller
racks or I/O racks, separate line power sources are recommended to provide the highest level of redundancy
and system operation.
Deviations from the installation conditions specified in this manual may invalidate this product’s
conformity with Low Voltage and EMC.
Hazardous voltages exist in the equipment enclosure.
Identify and avoid contact with voltage sources.
Failure to comply with these instructions could result in death or serious injury.
Controller Grounding
PROTECTIVE BONDING (grounding) of this controller and the enclosure in which it is installed shall be
in accordance with National Electrical Code (ANSI/NFPA 70) and with local electrical codes.
Figure 29 – Cabinet Wiring, Single Chassis
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