Installing PSUs
7750 SR-a4 and SR-a8 Installation Guide 103
To prepare the PSU end of the DC power cables:
Step 1. For the DC positive and DC negative wires, use a wire-stripping tool to strip the
wire insulation to the length according to the recommendation of the manufacturer
or local safety code (Keys 1 and 2 in Figure 33).
Step 2. Attach each wire to the terminal ring and crimp the ring lug according to the
instructions of the terminal ring manufacturer (Key 3 in Figure 33).
Figure 33: Attaching the Ring Lug to a Power Cable
Remote Cable Connections
Cables that connect to the building ground point, equipment bus ground point, DC power
sources, and disconnect devices must be prepared and attached according to the local safety
code.
Figure 34 shows an example of how redundant connections can be terminated. A circuit
breaker is used in each power feed as a disconnect device. See DC Power Requirements on
page 64 for information about the recommended ratings for circuit breakers.
Table 45: Ring Lug to Power Cable Descriptions
Key Description
1 #8 AWG copper wire (see Required tools and hardware)
2 Insulation stripped according to the recommendation of the manufacturer or local
safety code
3 Ring lug (see Required tools and hardware)
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