2
ABB Zenith
ZTSCT / ZBTSCT Operation & Maintenance Manual
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
LIFTING EYES
SPREADER BAR
H
45°
Figure 1
Power Connections
ABB 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 1
lists 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 3
shows
the engine-start contacts.
Make all other necessary control connections to the control
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 AWG to 250 MCM
1
#4 AWG to 600 MCM
2
#2 AWG to 600 MCM
4
#2 AWG to 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 AWG to 300 MCM
3
#4 AWG to 300 MCM
8
#2 AWG to 600 MCM
12
#2 AWG to 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
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.
DANGER
