T1689 Technical Manual Rev 07 Appendix C: Recommended Torque Settings
MV3000 Air Cooled DELTA Scope
Page 183
12. APPENDIX C: RECOMMENDED TORQUE SETTINGS
12.1 SCOPE
This document details the recommended tightening torque settings for electrical and mechanical connections
to DELTA modules.
The recommended torque settings are applicable to high-tensile steel (Grade 8.8) fasteners fitted with a single
turn spring washer under the nut, and with the threads being zinc plated, passivated and unlubricated, over the
normal operating temperature of these components.
Specifically excluded are:
fasteners with any other material (e.g. brass);
fasteners with any other finish (e.g. raw steel, cadmium plated, lubrication of any sort);
slotted holes in either steel or copper.
12.2 TORQUE SETTINGS FOR ELECTRICAL CONNECTIONS
The figures included in Table 12–1 are for electrical connections of copper conductor crimps to device
terminals and to all copperwork except busbars, for which figures are included in Table 12–2.
Fastener Size
Carbon Steel (8.8)
Table 12–1. – Torque Settings for Electrical Connections
12.3 TORQUE SETTINGS FOR BUSBAR JOINTS
The figures in Table 12–2 are for all busbar joints on copperwork.
Fastener Size
Carbon Steel (8.8)
Table 12–2. – Torque Settings for Busbar Joints
12.4 TORQUE SETTINGS FOR MECHANICAL CONNECTIONS
The figures in Table 12–3 are for the assembly and mounting of steel parts where specific electrical connection,
other than continuity, is not involved.
Fastener Size
Carbon Steel (8.8)
Table 12–3. – Torque Settings for Mechanical Connections
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