KEPCO RA 60 Rev 1, 2, 3 - Manual (Page 19)

RA60 SERIES 090910
2-7
2.6.3.1 A-C SOURCE POWER, SINGLE PHASE
For single-phase a-c source power, connect Terminal G of the rack adapter to source power
safety ground; then connect a separate wire pair from the power source to each Lx/Nx terminal
block pair to be populated by an HSP power supply (see Figure 2-6).
FIGURE 2-6. SINGLE PHASE A-C/D-C SOURCE POWER WIRING
If desired, a single wire pair can be run from the power source to any Lx/Nx pair, with jumpers
connecting the remaining Lx/Nx pairs to the first pair; however, the wires must be adequately
rated to support the total current being delivered through them. For the example shown in Fig-
ure 2-6, the jumper wires are sized for 16 amps, but the source wires must be sized for 3 times
16 amps, or 48 amps.
2.6.3.2 A-C SOURCE POWER, THREE PHASE
Three-phase a-c source power from either delta- or wye-configuration power sources can be
used. When using wye-configuration power, the user should configure the power system so as
to balance the load drawn from each phase to minimize the current flow in the source power
neutral wire whenever possible. When possible, the user should wire the rack adapter in accor-
dance with the instructions for delta power in order to take advantage of the lower input current
requirements. Regardless of the source power configuration, Terminal G of the rack adapter
must be connected to safety ground.
• Delta Power - Connect a separate wire pair from each Lx/Nx pair on the rack adapter
across successive line terminals of the source power (e.g., A-B, B-C, C-A) (see Figure 2-7).
FIGURE 2-7. THREE PHASE DELTA A-C SOURCE POWER WIRING