Appendix d – tightening torques tables – GE Industrial Solutions DC OEM Module For use with Gerapid DC Circuit Breaker User Manual
Page 30

DC OEM MODULE FOR USE WITH GERAPID CIRCUIT BREAKERS
APPENDIX C Layout Drawings.
30
Design and specifications are subject to change without notice
S47183Ee rev.01 2011-04-26
APPENDIX D – Tightening Torques Tables
All the tightening torques listed below are applicable for Module, Trolley and Breaker.
Table D-1 Tightening torques for mechanical construction elements
Screw size
Hex-head screws
Class 5.8
Hex-head screws
Class 8.8
Self-tapping
screws
Inch-pounds Inch-pounds
Inch-pounds
Less M3
3 – 4
5 - 6
-
M3
7 – 8
10 - 11
-
M3.5
9 - 10
15 - 17
8 - 10
M4
14 - 15
22 - 24
15 - 17
M5
26 - 29
44 - 49
62 - 68
M6
47 - 51
75 - 83
132 - 146
M8
106 - 117
177 - 194
177 - 194
M10
230 - 253
362 - 398
-
M12
362 - 398
620 - 681
-
M16
885 – 973
1500 - 1650
-
Table D-2 Tightening torques for electric circuits connections
Screw size
Auxiliary & control
circuits
Copper bus bar
connections
Inch-pounds Inch-pounds
Less M3
-
-
M3
9 - 10
-
M3.5
10 - 11
-
M4
13 - 15
-
M5
26 - 29
-
M6
52 - 58
71 - 78
M8
124 - 136
177 - 194
M10
230 - 253
354 - 390
M12
354 - 390
620 - 681
M16
531 - 584
1240 - 1360
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