Rockwell Automation 1784-PKTCS ControlNet PCI Scanner Card Installation Instrucitons - Manual (Page 5)

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WARNING
If you connect or disconnect the communications cable with power applied to
this module or any device on the network, an electrical arc can occur. This
could cause an explosion in hazardous location installations.
When used in a Class I, Division 2, hazardous location, this equipment must be
mounted in a suitable enclosure with proper wiring method that complies with
the governing electrical codes.
If you insert or remove the card while host power is on, an electrical arc can
occur. This could cause an explosion in hazardous location installations.
Be sure that power is removed or the area is nonhazardous before proceeding.