GE Industrial Solutions GE ZENITH SERIES MDU - Manual (Page 21)

Installation Procedures
GE Z ENITH C ONTROLS
MDU Owner’s Manual
601 S HILOH R OAD January 2013
Plano, TX 75074 Page 21
3.8.3. Optional Low Voltage Junction Box
An optional Low Voltage Junction Box may be provided with your MDU, and is an extension
of the Low Voltage Interface Board for Customer connections external to the MDU. This
provides a convenient access to the MDU’s interface terminals without exposing the
internal components of the MDU. The box is wall-mountable, and houses a contractor
board that is connected to the MDU via 10-ft long interface cables.
3.8.4. Output Distribution Cable(s) Installation
Warning: The MDU should be de-energized before attempting to install any output
cables or assemblies. Power distribution cables and assemblies should be
installed by a qualified electrical contractor and/or a factory authorized GE
representative. For assistance call GE at (800) 637-1738.
The MDU should be in its permanent position with all input power cables properly
connected before going any further. If the unit is resting on raised floor tiles, verify the
proper cutouts have been made before continuing. Be careful not to remove an excessive
amount of floor tiles that could cause the flooring to become unstable.
Note: Special care must be taken when assigning circuit breaker positions for proper
load balancing.
Optional output distribution cables may have been shipped already attached to the unit. If
this is the case, they should be removed from the pallet and uncoiled. After they are
uncoiled, they should be inspected before installation. Remove necessary floor tiles and lay
out the cables to their respective equipment. After the cables have been properly laid out,
replace all removed floor tiles.
Note: Output cables on k-rated units must have a neutral wire that is twice the size of
the phase wires.
With the output cables unattached and the unit in its permanent position, the following
procedures should be followed:
1. Open and remove the access door to the distribution panel board or sub-feed breaker.
2. Remove dead front cover panel exposing branch circuits or sub-feed breaker(s).
3. Remove cable entry cover panel.
4. Install the appropriate circuit breakers, if not factory-installed
5. Locate an appropriate sized pre-punched conduit knock out.
6. Remove locknut from distribution cable end.
7. Feed cable conductor up through knock out and re-install locknut.
8. Tighten locknut securely.
9. Remove the necessary floor tiles and route the cable to its respective equipment.
Note: Care should be taken when placing the output cables in the units to properly
align and lace these due to the limited area for placing cables. This will be
especially true for 400kVA-750kVA rated MDU’s when the maximum number of
sub-feeds are utilized. Please call the GE factory for any assistance needed to
insure the placement of these cables.
10. Replace floor tiles.
11. Strip insulation approximately 1/2 inch from the end of the cable.
12. Connect phase wires to the output circuit breaker terminals according to the chart
below: