Transformer lugs, Fasteners, Terminal blocks and distribution breakers – GE Industrial Solutions GE ZENITH SERIES MDU User Manual
Page 15
Installation Procedures
GE Z
ENITH
C
ONTROLS
MDU Owner’s Manual
601 S
HILOH
R
OAD
January 2013
Plano, TX 75074
Page 15
3.7.2. Transformer Lugs
Wire Size (Awg or MCM)
Required Torque (ft-lb)
2/0
4.2
250
22.9
350
31.3
500
31.3
3.7.3. Fasteners
Wire Size
installed,
AWG or
MCM
SLOTTED HEAD SCREWDRIVER TORQUE VALUE
(in-lb)
SCREW CONNECTOR
TORQUE VALUE
(in-
lb)
Slot width up to 3/64”
Slot length up to ¼”
Slot width over 3/64”
Slot length over ¼”
#14
15 in-lb
25 in-lb
35
#12
15 in-lb
25 in-lb
35
#10
15 in-lb
25 in-lb
35
#8
20 in-lb
25 in-lb
40
#6
25 in-lb
35 in-lb
45
#4
N/A
35 in-lb
45
#3
N/A
40 in-lb
N/A
#2
N/A
40 in-lb
50
#1
N/A
40 in-lb
50
1/0
N/A
40 in-lb
50
2/0
N/A
40 in-lb
50
3/0
N/A
40 in-lb
N/A
4/0
N/A
40 in-lb
N/A
3.7.4. Terminal Blocks and Distribution Breakers
Torque ratings vary depending on item in use. Please refer to label on the item.
3.0 ft-lb of torque is typically required for Distribution Breakers. There is a wide variation of
torque requirements for terminal blocks with various sizes.
Hex Socket Size
SOCKET HEAD SCREW CONNECTOR
TORQUE VALUE
(in-lb)
HEX SOCKET ALLEN SCREW
TORQUE VALUE
(in-lb)
1/8”
45
35
5/32”
100
80
3/16”
120
100
7/32”
150
120
¼”
200
150
5/16”
275
225
3/8”
375
300
½”
500
400
9/16”
600
500