Page | 7
4.2 Wiring Preparation
1. Verify that the equipment is the proper type. The Maintenance Bypass Switch
Cabinet (MBS) can be used in delta-delta or wye-wye applications, but the UPS
must be properly configured (refer to the UPS manual).
For delta-delta applications where an input neutral is not provided, the output
neutral connection must not be used and the MBS to UPS neutral connections
should be omitted.
2. Plan the locations of conduits. Two Conduit landing plates are provided at the top
(see
) and bottom of the cabinet.
a. Connection from Utility source and connection to the critical load can entry
the unit from top or bottom.
b. Connections between the MBS and UPS must be made at the bottom.
c. The low voltage control connection wires must be routed through the wire
duct below the terminal block to the bottom landing plate in the rear of the
cabinet to ensure physical separation between them and the power wiring.
3. All wiring is to be in compliance with all applicable codes. See
recommended cable sizes
4. Verify that the source circuit capability is in compliance with the requirements shown
in Table 3.
Figure 4 – Bus bar details