Juniper MX2020 Hardware Manual page 654

Figure 287: Connecting Power to a Three-Phase Delta AC Power Distribution Module
NOTE: The three-phase delta AC PDM terminal blocks will be flipped depending on which
slot the PDM gets plugged into.
NOTE: The color of each AC power wire might vary. The MX2020 chassis is not sensitive
to phase rotation sequence—either CW or CCW will operate correctly.
CAUTION:
If using your own cable, make sure you use the proper connections.
To insert wires into the terminal block that serves three PSMs:
a. Insert the grounding wire into the grounding point labeled GND.
b. Insert the wire labeled L1 into the input terminal labeled A2.
Wire label configuration is for Juniper Networks supplied cable only.
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