ADC Network Unit user manual Power and Ground Connections, Installation August 7

Chapter 2: Installation August 7, 2006

Step Action

6Connect the power supply to the DC IN connector located on the back of the ENIU.

–If using AC power, connect power supply to the AC source (110 – 240 VAC, 50 – 60 Hz).

–If using DC power, connect power following local practices. (See “Power and Ground Connections” on page 2-2.) See Appendix A: Specifications for fuse size.

7Verify that the STATUS LED is lit.

20384-A1

Figure 2-1. Inserting ENIU into Mounting Bracket

POWER AND GROUND CONNECTIONS

Power and ground connections are located on the back of the ENIU.

DANGER

WARNING

To avoid the possibility of severe and potentially fatal electric shock, use extreme care when working with the power terminations at the back of the ENIU.

Before making any connections to a ENIU, verify that the power is off (unplugged or fuse removed at the fuse and alarm panel).

Ground Connection

To assure proper operation, the ground stud located on the back of the ENIU (see Figure 2-2 on page 2-3) should be connected to a good earth ground. There must be no switching or disconnecting devices in the grounding circuit conductor between the ENIU and the point of connection to the grounding electrode conductor.

This procedure establishes a connection between the ENIU and a ground connection. A frame ground termination (#8 screw) is provided on the back of the ENIU for a frame ground connection. This connection must be made in accordance with all local and national electrical codes. The ENIU should be connected directly to a grounding electrode conductor or to a bonding jumper from a grounded electric box.

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