Square QED-2 - Torque Values for Electrical Connections

Section 9—Torque Values for Electrical Connections Power-Style™ QED-2 Switchboards
51© 1988–2018 Schneider Electric All Rights Reserved80043-055-13
ENGLISH
Section 9—Torque Values for Electrical Connections
Table 6 – 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)
★
Certain lugs require 620 lb-in (70 N•m) and are marked as such.
Table 7 – 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)