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Chapter 4 Installation in a Hazardous Environment
Wiring the External Alarm Device Relays
4-36
Catalyst 2955 Hardware Installation Guide
78-14944-03
Figure 4-15 shows the completed wiring for two external alarm devices on a
power and relay connector.
Figure 4-15 Completed Connections for Two External Alarm Devices on the
Power and Relay Connector
1 Power supply A positive
connection
5 External device 2, relay wire B
connection
2 Power supply A return
connection
6 External device 1, relay wire B
connection
3 External device 1, relay wire A
connection
7 Power supply B return
connection
4 External device 2, relay wire A
connection
8 Power supply B positive
connection
104920
RT
A1
A2
VB
VA
A1
A2
RT
1
2
3
4
5
6
7
8