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Chapter 4 Prerequisites for the UPS installation
Recommended cable cross-sections
Terminal
Terminal wire size rating
All
4-25 mm
Copper wire, solid or stranded.
Attention! It is important to check in a six (6) month interval the torque on the UPS side of the input
connector against the specification of 2.03 Nm (18 inch-pounds). If the screws in the UPS
utility power input terminal have to be tightened again, users should take caution to
maintain torque and not to overtighten the screws in the terminal block. Overtightening
of the screws could damage the conductors on both sides of the terminal blocks.
Take a note of the date when the last time the torque was checked and check it again
every six (6) months.
Not doing so can lead to an electro-thermal incident that can severely damage both the
utility power input wiring and the input terminal block thus making the UPS unit
unusable!
Any repair work in order to resolve the hardware issue is not covered by the unit
warranty or service contract.
See
Figure 17
not adhered to.
34
/ 12-4 AWG
2
on the next page for damage observed in case the above instructions are
Minimum wire size
10 mm
/ 8 AWG 105°C
2
16 mm
2
/ 6 AWG 90°C
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
Tightening torque
2.03 Nm / 18 in-lb
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