2GE Zenith Controls ■
ZTSCT / ZBTSCT Operation and Maintenance Manual (71R-5000A)
Installation
Table 2
Tightening Torque for Lugs
Socket Size
Across Flats
Torque
Lb. - In. Lb. - Ft.
45
1/8 4
100
5/32 8
120
3/16 10
150
7/32 12
200
1/4 17
275
5/16 23
375
3/8 31
500
1/2 42
600
9/16 50
D
CABINET
LIFTINGEYES
SPREADER BAR
H45°
Figure 1

Power Connections

GE Zenith transfer switches are supplied with UL listed
solderless screw type terminals as standard for the
Source 1, Source 2 and Load power connections.
Table 1lists the number and sizes of cable lugs supplied
as standard for each switch amp rating.
Connect the Source 1, Source 2, and Load conductors
to the clearly marked terminals on the transfer switch.
Remove surface oxides from cables by cleaning with a
wire brush. Verify that all connections are correct before
tightening the lugs. All cable lug connections must be
tightened to the proper torque values as shown in
Table 2.
NOTE: Do not run cables or wiring behind
front-connected transfer switches.

Engine Start

Control Connections
Engine-start control wires connect to control terminals
beside the MX250. Engine start terminals are indicated by
a schematic symbol (the symbol indicates the contact
state for a de-energized normal source). Figure 3shows
the engine-start contacts.
Make all other necessary control connections to the con-
trol panel terminal blocks per the schematics supplied
with the ATS.
NOTE: All control wires (18-12 AWG) must be
torqued to 19 in/lbs.
NOTE: When lifting the switch using a spreader bar,
height H must be equal to half of distance D.
Table 1

Power Connections: Screw Type Terminals for External Power Connections

Switch Size
(Amps)
40
80
100
150
200, 225, 2500
260, 300*, 400
600
800, 1000, 1200
Source 1, Source 2 & Load Terminals
1#8 AWG to 1/0
Cable Per Pole Range of Wire Sizes
1#8 AWG to 1/0
1#8 AWG to 1/0
1#8 AWG to 3/0
1#6 AWGto 250 MCM
1#4 AWG to 600 MCM
2#2 AWGto 600 MCM
4#2 AWGto 600 MCM
Neutral Bar (When Required)
3#8 AWG to 1/0
No. of Cables Range of Wire Sizes
3#8 AWG to 1/0
3#8 AWG to 1/0
3#8 AWG to 300 MCM
3#6 AWGto 300 MCM
3#4 AWG to 300 MCM
8#2 AWGto 600 MCM
12 #2 AWGto 600 MCM
1600, 2000
2600, 3000, 4000 Line, Load and Neutral terminals are located in the rear of switch
and arranged for bus bar locations
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.