Wiring Nema Type B Motor Control Centers; Wiring Nema Type C Motor Control Centers - GE Evolution Series E9000 User Manual

Evolution Series E9000 User Manual

Wiring NEMA Type B Motor Control Centers

Use the following procedure to wire NEMA Type B MCCs:
1. Remove black plastic barrier closest to unit connection
points and remove knockouts as required.
2. Pull load cables near the unit to be wired. Measure
(allowing for cable bends), cut and strip the cables,
and feed them carefully through barrier knockout
into the unit. Terminate feeder cables directly on the
lugs on the disconnect. Connect the motor leads at
the starter terminals if either of these conditions is met:
a. The motor control center is furnished as
"NEMA B-D wiring" (where D=Device) or
b. The starter is NEMA size 6 or smaller.
Connect the motor leads to the starter at the T1, T2,
and T3 terminals if these conditions are met:
a. The equipment is furnished as "NEMA B-T" wiring
and
b. The starter is NEMA size 2 or smaller.
Install plastic side barrier after power and control
wiring in Step 4 is complete.
Aluminum wire is not recommended for this product.
3. Pull the control wiring, then measure, cut, strip and
terminate it at the terminal blocks provided within
the unit. Optionally, control terminal blocks may be
pulled apart and the plastic knock-outs removed to
allow wiring outside the bucket. The terminal blocks
can then be placed back through the plastic knock-
out openings and reinstalled. This method allows
wiring to terminal blocks outside the con nes of the
starter unit.
4. When speci ed, an optional ground lug is provided in
each draw-out combination starter unit for terminating
a motor frame grounding wire. (For larger starters,
the lug is mounted on the horizontal ground bus.)
5. Use cord or plastic ties to secure all wiring. Route the
wiring to avoid interference with moving parts and
to keep it away from heat-producing components,
such as resistors and fuses.
6. Verify that the connections on all devices and terminal
blocks are tightened to their proper torque values, as
listed on the label on the vertical wireway door.
15

Wiring NEMA Type C Motor Control Centers

Master terminal boards in NEMA Type C motor control
centers are provided in the larger top or bottom
horizontal wireway of each vertical section. (Refer to
the drawings provided by GE for the locations of master
terminal boards.) Figure 19 and Figure 20 show typical
Type C terminal board arrangements.
These terminal boards are connected at the factory to
control terminal blocks of plug-in units in each vertical
section. Wiring diagrams provided by GE show these
terminal points. These terminal blocks are also factory
wired to the T1, T2 and T3 motor-lead terminals for each
NEMA size 1–2 starter unit in each vertical section.
Field connections to these control and load terminals
should be made at the master terminal boards.
Make eld connections to all feeders and motor loads
for starters larger than NEMA size 2 as described for
NEMA Type B motor control centers.
Optional grounding lug can be provided in each Plug-in
unit if vertical ground bus is speci ed.
Figure 19. Typical Type C terminal board at the top of a section
Figure 20. Typical Type C terminal boards in multiple sections