VTI UDS MB and FD Series - Manual (Page 2)

To insure proper installation, this manual must be read prior to starting the
installation process.
1. Introduction
This manual covers installation instructions for the MB Series and FD Series of Unitized
Distribution substations (UDS).
The MB Series UDSs are implemented with a circuit breaker on the secondary of the
transformer and an optional circuit breaker on the primary of the transformer.
The FD Series UDSs are implemented with a fused disconnect switch on the secondary of
the transformer and an optional fused disconnect switch on the primary of the transformer.
1.1 Reference Drawings (either standard drawings listed below or custom drawings for
specific projects are included with each MB Series/FD Series UDS)
Refer to the MAIN ASSEMBLY AND WIRING DIAGRAM which have been
specifically prepared for your order. These drawings provide the overall cabinet
dimensions, mounting information, component location, wiring, branch circuit
breaker type and rating, plus a bill of material listing manufacturer and rating of all
major components.
2. INITIAL CONSIDERATIONS
Move the UDS Cabinet to the desired location and remove the shipping crate from the
cabinet.
Remove the field wiring entry plate on top of the cabinet to obtain access to wireways.
Turn the secondary disconnect switch (breaker) to the “OFF” position.
Loosen the fasteners which secure the door to the 42 circuit breakers and open the door.
Place all the circuit breakers in the “OFF” position. Remove the five screws holding down
the trim panel covering the 42 circuit breakers. Remove the trim panel to obtain access to
the circuit breaker terminal blocks.
Remove the transformer cover plate.
If the optional primary disconnect switch (breaker) is installed, turn it to the “OFF”
position, loosen the fasteners which secure the primary disconnect door and open the
door.