Juniper MX240 Hardware Manual page 252

CAUTION:
supply is 36 lb-in. (4.0 Nm). The terminal studs may be damaged if excessive
torque is applied. Use only a torque-controlled driver or socket wrench to tighten
nuts on the DC power supply terminal studs.
Figure 73: Connecting Power Cables to the DC Power Supply
5. Verify that the DC power cable is connected correctly, that it does not touch or block access to router
components, and that it does not drape where people could trip on it.
6. Replace the clear plastic cover over the terminal studs on the faceplate.
7. Attach the power cable to the DC power source.
8. Turn on the dedicated customer site circuit breaker to the power supply.
9. Verify that the INPUT OK LED on the power supply is lit steadily.
10. On each of the DC power supplies, switch the DC circuit breaker to the center position before moving
it to the on (—) position.
The maximum torque rating of the terminal studs on the DC power
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