Juniper QFX5220, Hardware Manual

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Figure 56: Connecting a Straight DC Power Cable to a DC Power Supply (CBL-JNP-PWR-DSUB)
WARNING: Ensure that the power cables do not block access to device components
or drape where people can trip on them.
5. Using the slotted screwdriver, tighten the screws on the power cable connector to between 6 lb-in
(0.68 Nm) to 7 lb-in (0.79 Nm).
CAUTION: You must use an appropriate torque-controlled tool to tighten the screws.
Applying excessive torque damages the terminal block and the wiring tray. The absolute
maximum torque that may be applied to this screw is 10 lb-in (1.13 Nm).
6. Repeat 4 through 5 for each power supply that you are connecting to power.
7. Close the input circuit breaker.
We recommend that the 48 VDC facility DC source be equipped with a circuit breaker rated at 40 A
(–48 VDC) minimum, or as required by local code.
NOTE: We recommend that the 48-VDC facility DC source be equipped with a circuit breaker
rated at 40A (-48 VDC) minimum, or as required by local code.
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