Kohler 20--2800 kW manual Terminal Connector Torque

7.4 Terminal Connector Torque

Use the torque values shown in Figure 7-4 or Figure 7-5 for terminal connectors. Refer to UL-486A, UL-486B, and UL-486E for information on terminal connectors for aluminum and/or copper conductors. See Section 7.2, Electrical Connections, for information on the temperature rating of customer-supplied wire. Comply

with 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 7-4.

					Tightening Torque, Nm (in. lb.)
Wire Size for Unit						Hexagonal Head—External
Connection			Slot Head 4.7 mm (No. 10) or Larger*			Drive Socket Wrench
			Slot Width <1.2 mm (0.047 in.)		Slot Width >1.2 mm (0.047 in.)	Split-Bolt		Other
AWG, kcmil (mm2)			Slot Length <6.4 mm (0.25 in.)		Slot Length >6.4 mm (0.25 in.)	Connectors		Connections
18--10 (0.82--5.3)		2.3 (20)			4.0 (35)	9.0	(80)	8.5	(75)
8 (8.4)		2.8 (25)			4.5 (40)	9.0	(80)	8.5	(75)
6--4 (13.3--21.2)		4.0 (35)			5.1 (45)	18.6	(165)	12.4	(110)
3 (26.7)		4.0 (35)			5.6 (50)	31.1	(275)	16.9	(150)
2 (33.6)		4.5 (40)			5.6 (50)	31.1	(275)	16.9	(150)
1 (42.4)			—		5.6 (50)	31.1	(275)	16.9	(150)
1/0--2/0 (53.5--67.4)			—		5.6 (50)	43.5	(385)	20.3	(180)
3/0--4/0 (85.0--107.2)			—		5.6 (50)	56.5	(500)	28.2	(250)
250--350 (127--177)			—		5.6 (50)	73.4	(650)	36.7	(325)
400 (203)			—		5.6 (50)	93.2	(825)	36.7	(325)
500 (253)			—		5.6 (50)	93.2	(825)	42.4	(375)
600--750 (304--380)			—		5.6 (50)	113.0	(1000)	42.4	(375)
800--1000 (406--508)			—		5.6 (50)	124.3	(1100)	56.5	(500)
1250--2000 (635--1016)			—		—	124.3	(1100)	67.8	(600)
* 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 7-4 Tightening Torque for Screw-Type Pressure Wire Connectors
Socket Size Across Flats,			Tightening Torque,
mm (in.)			Nm (in. lb.)
3.2	(1/8)		5.1	(45)
4.0	(5/32)		11.4	(100)
4.8	(3/16)		13.8	(120)
5.6	(7/32)		17.0	(150)
6.4	(1/4)		22.6	(200)
7.9	(5/16)		31.1	(275)
9.5	(3/8)		42.4	(375)
12.7	(1/2)		56.5	(500)
14.3	(9/16)		67.8	(600)
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 7-5 Tightening Torque for Pressure Wire

Connectors with Internal-Drive

Socket-Head Screws

TP-5700 7/93 Section 7 Electrical Requirements 37