DC Power Cables
Overview
DC power cables include -48 V power cables and RTN ground cables. You need to cut the delivered DC power cables into appropriate lengths according to actual situations in your site and make DC power cables onsite. Choose appropriate DC power cables for different scenarios according to the following rules:
If a switch is connected to a power distribution box or frame, use DC power cables with a JG2 90° right angle terminal at one end and an OT terminal at the other end.
If a switch is directly connected to a power distribution cabinet, use DC power cables with a JG2 90° right angle terminal at one end and determine the terminal type at the other end and the cable length based on the site survey result.
Do not bend OT terminals to 90 degrees onsite.
DC power cables with the following cross-sectional areas are available: 25 mm2 and 35 mm2. They apply to scenarios that require different power supply distances, as listed in Table 7-1.
Appearance and Structure
The figures provided here are for reference only and may differ from the actually delivered cables.
Figure 7-1 shows a DC power cable used for connection with a power distribution box or frame.
1. JG2 90° right angle terminal |
2. OT terminal |
Figure 7-2 shows a DC power cable used for connection with a power distribution cabinet.
1. JG2 90° right angle terminal |
Connection
A DC power cable transmits DC power to a chassis. Terminals are crimped onsite. A DC power cable is connected in the following way:
When a device is connected with a power distribution box or frame, the JG2 90° right angle terminal is connected to a terminal block on a DC PEM at the rear of the device chassis, and the OT terminal is connected to the power distribution box or frame.
When a device is connected with a power distribution cabinet, the JG2 90° right angle terminal is connected to a terminal block on a DC PEM at the rear of the device chassis, and the other end is connected to the power distribution cabinet.