Torque Values for Electrical Connections
| NOTICE |
|---|
|
HAZARD OF ELECTRICAL CONNECTION OVERHEATING
Torque electrical connections to the values recommended
in the tables below.
Failure to follow these instructions can result in equipment
damage.
|
Incoming and Plug-on Neutral Lug
| Socket Size Across Flats | Torque Value lb-in. ( N•m) |
|---|---|
| 1/4 in. | 180 (20) |
| 5/16 in. | 250 (28) |
| 3/8 in. | 340 (38) |
| 1/2 1 | 450 (51) |
| 1 Certain lugs require 620 (70) and are marked as such. | |
Multiple Conductor Neutral and/or Ground Bar
| Screw Type | Lug Wire Range | Conductor Size | Torque Value lb-in. (N•m) |
|---|---|---|---|
| Slotted Head | 14–4 | 14-10 Cu, 12-10 Al | 20 (2) |
| 8 Cu-Al | 25 (3) | ||
| 6-4 Cu-Al | 35 (4) | ||
| 14–1/0 | 14-8 Cu-Al | 36 (4) | |
| 6-1/0 Cu-Al | 45 (5) | ||
| Socket Head | 14–1/0 | All | 100 (11) |
| 6–300 kcmil | All | 275 (31) |
|
|
Hardware Description | Torque Value lb-in. (N•m) |
| 1/2 in. | 720–840 (81–95) |
|
|
Hardware Description | Torque Value lb-in. (N•m) |
| 1/4 in. | 50–75 (6–8) | |
| 3/8 in. | 175–225 (20–25) | |
| 1/2 in. | 250–350 (28–40) |
|
|
Hardware Description | Torque Value | |
|---|---|---|---|
| Conical Washer OD in. (mm) |
Square Head (Tee) Bolt Conical Washer lb-in. (N•m) | ||
| 3/8 in. |
0.87 (22) |
250–280 (28–32) |
|
|
1.00 (25) |
130–150 (15–17) |
||
| 1/2 in. |
1.25 (32) 2.25 (57) |
450–550 (51–62) |
|
|
|
Hardware Description | Torque Value | |
|---|---|---|---|
| Conical Washer OD in. (mm) | Hex Head Bolt (2) Conical Washers lb-in. (N•m) | ||
| 5/16 in. | 0.90 (23) | 145–160 (16–18) | |
| 3/8 in. | 0.87 (22) | 250–280 (28–32) | |
| 1.00 (25) | 130–150 (15–17) | ||
| 1/2 in. | 1.25 (32)
2.25 (57) 3.00 (76) |
720–840 (81–95) | |
|
|
Hardware Description | Torque Value lb-in. (N•m) |
|---|---|---|
| 1/4 in. | 50–75 (6–8) | |
| 5/16 in. | 80–125 (9–14) | |
| 3/8 in. | 175–225 (20–25) | |
| 1/2 in. | 250–350 (28–40) |