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5.9 Terminal Connector Torque
Use the torque values shown in Figure 5-2 or Figure 5-3
for terminal connectors. Refer to UL-486A, UL-486B,
and UL-486E for information on terminal connectors for
aluminum and/or copper conductors.
applicable national and local codes when installing a
wiring system.
Note: If a connector has a clamp screw such as a
slotted, hexagonal head screw with more than
one means of tightening, test the connector using
both applicable torque values provided in
Figure 5-3.
Wire Size for Unit
Connection
2
AWG, kcmil
(mm
)
18--10
(0.82--5.3)
8
(8.4)
6--4 (13.3--21.2)
3
(26.7)
2
(33.6)
1
(42.4)
1/0--2/0 (53.5--67.4)
3/0--4/0 (85.0--107.2)
250--350
(127--177)
400
(203)
500
(253)
600--750
(304--380)
800--1000
(406--508)
1250--2000 (635--1016)
* For values of slot width or length not corresponding to those specified, select the largest torque value associated with the conductor size.
Slot width is the nominal design value. Slot length is to be measured at the bottom of the slot.
Note: If a connector has a clamp screw such as a slotted, hexagonal head screw with more than one means of tightening, test the connector
using both applicable torque values.
Figure 5-3 Tightening Torque for Screw-Type Pressure Wire Connectors
38
Section 5 Electrical System
Comply with
Slot Head 4.7 mm (No. 10) or Larger*
Slot Width <1.2 mm (0.047 in.)
Slot Length <6.4 mm (0.25 in.)
2.3 (20)
2.8 (25)
4.0 (35)
4.0 (35)
4.5 (40)
—
—
—
—
—
—
—
—
—
Socket Size Across Flats,
mm (in.)
3.2
(1/8)
4.0
(5/32)
4.8
(3/16)
5.6
(7/32)
6.4
(1/4)
7.9
(5/16)
9.5
(3/8)
12.7
(1/2)
14.3
(9/16)
Note: For values of slot width or length not corresponding to
those specified, select the largest torque value associated
with the conductor size. Slot width is the nominal design
value. Slot length is to be measured at the bottom of the
slot.
Figure 5-2 Tightening Torque for Pressure Wire
Connectors with Internal-Drive
Socket-Head Screws
Tightening Torque, Nm (in. lb.)
Slot Width >1.2 mm (0.047 in.)
Slot Length >6.4 mm (0.25 in.)
4.0 (35)
4.5 (40)
5.1 (45)
5.6 (50)
5.6 (50)
5.6 (50)
5.6 (50)
5.6 (50)
5.6 (50)
5.6 (50)
5.6 (50)
5.6 (50)
5.6 (50)
—
Tightening Torque,
Nm (in. lb.)
5.1
(45)
11.4
(100)
13.8
(120)
17.0
(150)
22.6
(200)
31.1
(275)
42.4
(375)
56.5
(500)
67.8
(600)
Hexagonal Head—External
Drive Socket Wrench
Split-Bolt
Other
Connectors
Connections
9.0
(80)
8.5 (75)
9.0
(80)
8.5 (75)
18.6 (165)
12.4 (110)
31.1 (275)
16.9 (150)
31.1 (275)
16.9 (150)
31.1 (275)
16.9 (150)
43.5 (385)
20.3 (180)
56.5 (500)
28.2 (250)
73.4 (650)
36.7 (325)
93.2 (825)
36.7 (325)
93.2 (825)
42.4 (375)
113.0 (1000)
42.4 (375)
124.3 (1100)
56.5 (500)
124.3 (1100)
67.8 (600)
TP-6609 6/08
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