User manual

3.6.6 Torque Requirements for Power Wiring Terminations
37
3 - INSTALLATION
Wire size installed in conductor
Tightening torque, pound-inches (N-m)
Slotted head NO. 10 and larger
Hexagonal head-external drive socket
wrench
AWG or kcmil (mm
2
)
Slot width-0.047 inch
(1.2mm) or less and
slot length ¼ inch
(6.4mm) or less
Slot width-over 0.047
inch (1.2mm) or slot
length – over ¼ inch
(6.4mm) or less
Split- bolt connectors
(N-m)
Other connectors
(N-m)
18 – 10 (0.82 – 5.3) 20 (2.3) 35 (4.0) 80 (9.0) 75 (8.5)
8 (8.4) 25 (2.8) 40 (4.5) 80 (9.0) 75 (8.5)
6 – 4 (13.3 – 21.2) 35 (4.0) 45 (5.1) 165 (18.6) 110 (12.4)
3 (26.7) 35 (4.0) 50 (5.6) 275 (31.1) 150 (16.9)
2 (33.6) 40 (4.5) 50 (5.6) 275 (31.1) 150 (16.9)
1 (42.4) — — 50 (5.6) 275 (31.1) 150 (16.9)
1/0 – 2/0 (53.5 – 64.4) — — 50 (5.6) 385 (43.5) 180 (20.3)
3/0 – 4/0 (85.0 – 107.2) — — 50 (5.6) 500 (56.5) 250 (28.2)
250 – 350 (127 – 177) — — 50 (5.6) 650 (73.4) 325 (36.7)
400 (203) — — 50 (5.6) 825 (93.2) 375 (36.7)
500 (253) — — 50 (5.6) 825 (93.2) 375 (42.4)
600 – 750 (304 – 380) — — 50 (5.6) 1000 (113.0) 375 (42.4)
800 – 1000 (406 – 508) — — 50 (5.6) 1100 (124.3) 500 (56.5)
1250 – 2000 (635 – 1010) — — — — 1100 (124.3) 600 (67.8)
z NOTE – For a value of slot width or length not corresponding to those specified above, the largest torque value associated with
the conductor size shall be marked. Slot width is the nominal design value. Slot length is measured at the bottom of the slot.
Table 15: Slotted Screws and Hex Bolts