GE Industrial Solutions ASTAT-XT RVSS PANEL - Manual (Page 39)

DEH40623 - Page 8 AN BL-0464, Rev.02, 04/15/2012
ASTAT-XT RVSS PANEL
UL508
Table 54.1 , Tightening torque for screws
Test wire size installed in
connector (AWG)
Tightening torque (lb in.)
Slotted head no 10 and large
Hexagonal head - external
drive socket wrench
Slot width - 0.047 inch or less
and slot length 1/4 inch or less Slot width - 0.047 inch or
slot length - over 1/4 inch
Split bolt connectors
other
connector
s
18-10 20 35 80 75
8 25 40 80 75
6-4 35 45 165 110
3 35 50 275 150
2 40 50 275 150
1 - 50 275 150
1/0 - 2/0 - 50 385 180
3/0-4/0 - 50 500 250
250-350 - 50 650 325
400 - 50 825 375
500 - 50 825 375
600-750 - 50 1000 375
800-1000 - 50 1100 500
1250-2000 - - 1100 600
Note : For values of slot width or length not corresponding to those specified, the largest torque value associated with
the conductor size shall be marked. Slot width is the normal design value. Slot length shall be measured at the bottom
of the slot
Table 54.2 , Tightening torque for slotted head screws smaller than No. 10 intended for use with 8 AWG or smaller
conductors
Slot length of screw
a
Tightening torque, lb.in
Slot width of screw
b
smaller than 0.047 in
Slot width of screw
b
0.047 in and
larger
<5/32 7 9
5/32 7 12
3/16 7 12
7/32 7 12
1/4 9 12
9/32 - 15
Above 9/32 - 20
a
For slot length of intermediate values, torques pertaining to next shorter length shall be utilized. For screws with
multiple tightening means, the largest torques value associated with the conductor size shall be marked. Slot length
shall be measured at the bottom of the slot
b
Slot width is the nominal design value
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