Torque Values for Electrical Connections
Incoming, Branch, and Neutral Lug
|
Socket Size Across Flats |
Torque Value |
|---|---|
|
1/4 in. |
180 lb-in. (20 N•m) |
|
5/16 in. |
250 lb-in. (28 N•m) |
|
3/8 in. |
340 lb-in. (38 N•m) |
|
1/2 in.* |
450 lb-in. (51 N•m) |
Multiple Conductor Neutral and/or Ground Bar
|
Screw Type |
Lug Wire Range |
Conductor Size |
Torque Value |
|---|---|---|---|
|
Slotted Head |
14–4 |
14-10 Cu, 12-10 Al |
20 lb-in. (2 N•m) |
|
8 Cu-Al |
25 lb-in. (3 N•m) |
||
|
6-4 Cu-Al |
35 lb-in. (4 N•m) |
||
|
14–1/0 |
14-8 Cu-Al |
36 lb-in. (4 N•m) |
|
|
6-1/0 Cu-Al |
45 lb-in. (5 N•m) |
||
|
Socket Head |
14–1/0 |
All |
100 lb-in. (11 N•m) |
|
6–300 kcmil |
All |
275 lb-in. (31 N•m) |
Carriage Bolt Hex Nut Conical Washer
|
Hardware Description |
Torque Value |
||
|
1/2 in. |
720–840 lb-in. (81–95 N•m) |
Carriage Bolt Conical Washer Assembly Keps Nut/Hex Head Bolt Conical Washer Assembly Keps Nut
|
Hardware Description |
Torque Value |
||
|
1/4 in. |
50–75 lb-in. (6–8 N•m) | ||
|
5/16 in. |
80–125 lb-in. (9–14 N•m) |
||
|
3/8 in. |
175–225 lb-in. (20–25 N•m) |
||
|
1/2 in. |
250–350 lb-in. (28–40 N•m) |
Square Head (Tee) Bolt Conical Washer Assembly Keps Nut
|
Hardware Description |
Torque Value |
||
| 1/4 in. | 50–75 lb-in. (6–8 N•m) | ||
|
3/8 in. |
175–225 lb-in. (20–25 N•m) |
||
|
1/2 in. |
250–350 lb-in. (28–40 N•m) |
Square Head (Tee) Bolt Conical Washer Assembly Keps Nut
|
Hardware Description |
Torque Value |
||
|
Conical Washer OD |
Square Head (Tee) Bolt Conical Washer |
||
|
3/8 in. |
0.87 in. (22 mm) | 250–280 lb-in. (28–32 N•m) | |
| 1.00 in. (25 mm) | 130–150 lb-in. (15–17 N•m) | ||
|
1/2 in. |
1.25 in. (32 mm) | 450–550 lb-in. (51–62 N•m) | |
|
2.25 in. (57 mm) |
|||
Hex Head Bolt (2) Conical Washers
| |
Hardware Description |
Torque Value |
|
|
Conical Washer OD |
Square Head (Tee) Bolt Conical Washer |
||
| 5/16 in. | 0.90 in. (23 mm) | 145–160 lb-in. (16–18 N•m) | |
|
3/8 in. |
0.87 in. (22 mm) | 250–280 lb-in. (28–32 N•m) | |
| 1.00 in. (25 mm) | 130–150 lb-in. (15–17 N•m) | ||
|
1/2 in. |
1.25 in. (32 mm) |
720–840 lb-in. (81–95 N•m) |
|
|
2.25 in. (57 mm) |
|||
|
3.00 in. (76 mm) |
|||