Alpha Technologies 255A Bypass Switch - Manual (Page 15)

13 0200018-J0 Rev C
Procedure
Figure 7 shows two typical configurations for wiring the Alpha MBS into an UPS system.
1. Use a #6 AWG wire and up to 350 kcmil wire (minimum 75 ºC rating) to connect the Alpha MBS and
UPS to the utility line. Refer to typical wiring diagrams in Figure 7.
2. Torque the terminal blocks to 31 N-m (275 in-lbs).
NOTE:
Phase detection is measured between TB2-L1 and TB3-L1. See the "System Schematic"
on page 14.
For a single-phase installation, ALWAYS USE L1 on all terminal blocks (TB1, TB2, TB3).
For a 2-pole installation, use L1 for one line on all terminal blocks.