Juniper MX2020 Hardware Manual page 316

To connect an AC power cord to an AC power source:
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
an approved site ESD grounding point. See the instructions for your site.
2. Switch off the dedicated customer-site circuit breakers. Ensure that the voltage across the AC power
source cable leads is 0 V and that there is no chance that the cable leads might become active during
installation.
3. Detach the ESD grounding strap from the approved site ESD grounding point, and connect the strap
to one of the ESD points on the chassis.
4. Move the power switches on all the power supply module (PSM) faceplates to the off (O) position.
5. Verify that the correct three-phase delta PDMs are installed and secured in the chassis before connecting
power cables.
NOTE: The power cables must be uninstalled and removed from the three-phase delta
PDM before removal of the PDM from the chassis.
6. Using a number 2 Phillips (+) screwdriver, unscrew the four captive screws located on either side of
the metal AC wiring compartment (four screws total per PDM).
7. Remove the metal cover of the metal AC wiring compartment.
8. Unscrew the retaining nut from the AC power cord.
9. Place the retaining nut inside the metal wiring compartment.
10. Insert the wires of the AC power cord through the hole of the retaining nut and rubber grommet.
11. Insert the wires of the AC power cord through the hole of the metal wiring compartment.
12. Connect the wires to the AC terminal block on the three-phase delta AC PDM (see
Figure 127 on page 297). Loosen the input terminal or grounding point screw, insert each wire into the
grounding point input terminal, and tighten the screw (see
gauge).
Table 86 on page 298 for approved AC wire
296