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Torque the Power End Feed Box interior 3-phase live and neutral conductor connections according to
Electrical Connection Torque Specifications
on page 10. For units equipped with monitoring, the voltage
sense leads are torqued to 7.4 ft.-lb. (10Nm) for 3-phase and neutral conductors; the monitoring ground is
torqued to 3 ft.-lb. (4Nm).
If the monitoring option is included in your system, refer to SL-70526 for detailed monitoring setup
information.
Figure 2.4 Applicable Hardware Stack for Electrical Torque Specifications
ITEM
DESCRIPTION
1
Bolt
2
Belleville Washer
3
Flat Washer
4
Nut
Table 2.4 Torque Specification Overview
HARDWARE
1 BELLEVILLE WASHER
2 BELLVILLE WASHERS
1/4 in. (M6/10mm)
40 in.-lb. (4.5Nm)
80 in.-lb. (9.0Nm)
5/16 in. (M8/13mm)
80 in.-lb. (9.0Nm)
160 in.-lb. (18.0Nm)
3/8 in. (M10/17mm)
120 in.-lb. (13.6Nm)
240 in.-lb. (27.1Nm)
1/2 in. (M12/19mm)
480 in.-lb. (54.2Nm)
—
Table 2.5 Electrical Connection Torque Specifications
Vertiv™ | Liebert® MBX Busway System Installer/User Guide
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