Appendix B Installation In a Hazardous Environment
Verifying Switch Operation
Attach the Power and Relay Connector to the Switch
Follow these steps to attach the power and relay connectors to the front panel of the switch.
Step 1 Insert the power and relay connector into the Pwr A receptacle on the switch front panel. See Figure
Warning When you connect or disconnect the power and relay connector with power applied, an electrical arc can occur. This could cause an explosion in hazardous area installations. Be sure that power is removed from the switch and alarm circuit. Be sure that power cannot be accidentally turned on or verify that the area is nonhazardous before proceeding.
Failure to securely tighten the power and relay connector captive screws can result in an electrical arc if the connector is accidentally removed. Statement 1058
Figure B-17 Connecting the Power and Relay Connector to the Switch
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V RT A AV RT A A
4 3
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1 | Power source A connector | 3 | Pwr B receptacle |
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2 | Pwr A receptacle | 4 | Power source B connector |
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Step 2 Use a ratcheting torque flathead screwdriver to tighten the captive screws on the sides of the power and relay connector.
When you are testing the switch, one power source is sufficient. If you are installing the switch and are using a second power source, repeat this procedure for the second power and relay connector (Pwr B), which installs just below the primary power connector (Pwr A).
When you are installing the switch, secure the wires coming from the power and relay connector so that they cannot be disturbed by casual contact. For example, use tie wraps to secure the wires to the rack.
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