Juniper MX2020 Hardware Manual page 318

NOTE: The color of each AC power wire might vary. The MX2000 chassis is not sensitive
to phase rotation sequence—either CW or CCW will operate correctly.
CAUTION:
If you are using your own cable, make sure you use the proper connections.
To connect wires to 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.
c. Insert the wire labeled L2 into the input terminal labeled B2.
d. Insert the wire labeled L3 into the input terminal labeled C2.
WARNING:
by mis-wired PDMs, before reinstalling the metal cover to the wiring
compartment apply AC voltage to the PDM (with disengaged PSM) make sure
that two LEDs on the PDM are lit green and that the AC voltage between AC
terminal blocks A1-B1, B1-C1, C1-A1, A2-B2, B2-C2, and C2-A2 for three-phase
delta PDM is not more than 264 VAC when measured with a digital voltage
meter (DVM). Then turn off the AC breaker, de-energizing the PDM, and install
the metal cover and engage all AC PSMs.
NOTE: The terminal connections have either slotted screws or hex screws. Use a 1/4-in.
slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the
5/16-in. hex screws
NOTE: Three-phase delta AC wire assembly kits can be purchased from Juniper Networks.
Table 86: Supported Three-Phase Delta AC Wire Gauge
Wire Gauge
4 x 6-AWG or equivalent
Wire label configuration is for Juniper Networks supplied cable only.
To protect power supplies from input voltage that might be caused
Description
4 conductor wires, each wire is 6-AWG
298