Extreme Networks ExtremeSwitching VDX 6740, Hardware Installation Manual

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7. Refer to "Power Precautions."
8. Follow these additional precautions when making connections to DC power supplies:
NOTE
The equipment installation must meet NEC/CEC code requirements. Consult local authorities for regulations.
CAUTION
For the DC input circuit to the system, make sure there is a 20 Amp circuit breaker, minimum -48 VDC, double
pole, on the input terminal block to the power supply. The input wiring for connection to the product should be
copper wire, 12 AWG, marked VW-1, and rated minimum 90°C.
CAUTION
DC return shall be isolated from the chassis ground (DC-I) when connections to the power supply are made.
Connecting a DC power cord to a 250W DC power supply
Use the following steps to connect DC power cords to 250W DC power supplies.
1. Remove the DC wiring assembly from the front of each DC power supply by loosening the two assembly screws.
FIGURE 63 The DC wiring assembly
1 Wire tightening screws 2 DC power source wires
3 Earth ground wire
2. Loosen the wire tightening screws and insert wires from the DC power source into the wiring assembly. Connect the -48V
source cable to the negative terminal and the 0V cable to the positive terminal as marked on the harness assembly.
3. Tighten the wire tightening screws and reinstall the wiring assembly onto the power supply.
4. Tighten the assembly screws on the wiring assembly to secure it to the power supply.
5. Connect the wires from the power supply wiring assembly to your DC power source.
Providing power to the device
ExtremeSwitching VDX 6740 Hardware Installation Guide
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