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LIEBERT DSE PACKAGED SOLUTION
STANDARD ELECTRICAL CONNECTIONS
1)
HIGH VOLTAGE ENTRANCE – This area will be used for the high voltage entrance (120V or more). Enclosure is provided with
provisions for field installed power entry kit to be completed by installer in the field. Power entry kits are not provided with holes or
knockouts, which must be done by the installer in the field. The fittings used must have the proper environmental rating per code. The
location to be used will be determined by which power entry kit is ordered. Refer to the installation instructions of the power entry kit
ordered for more information on installation.
ACCEPTABLE POWER SUPPLIES FOR 480V NOMINAL UNITS:
i.
480V wye with solidly grounded neutral and 277V line to ground;
ii.
Wye with high resistance (or impedance) ground;
iii.
Delta with corner ground (EMC Filter of VFD's must be removed; see DPN001946).
UNACCEPTABLE POWER SUPPLIES FOR UNITS:
iv.
Delta without ground or with floating ground;
v.
Delta with grounded center tap.
2)
LOW VOLTAGE ENTRANCE – This area will be used for the low voltage and communication fittings. Enclosure is not provided with
holes or knockouts, which must be done by the installer in the field. The fittings used must have the proper environmental rating per
code.
3)
MAIN UNIT POWER CONNECTION – Terminals are located on top of the locking disconnect switch. See side of disconnect switch for
wire range and tightening torque. Three phase service not provided by Liebert. Wire range and tightening torque will vary based on
disconnect size. Refer to label on side of disconnect.
4)
EARTH GROUND CONNECTION FOR MAIN UNIT POWER – Terminal for field supplied source earth grounding wire. Earth
grounding required for Liebert units. 6AWG-350KCMIL wire range, 375 in-lb wire tightening torque.
5)
FIELD SUPPLIED 120V UTILITY POWER – Terminals for the connection of a field supplied 120V 20A utility power to feed the light and
service electrical outlet. 22-8AWG wire range, 14.2lb-in tightening torque.
6)
EARTH GROUNDING CONNECTION FOR FIELD SUPPLIED 120V UTILITY POWER - Terminal for field supplied 120V earth
grounding wire. Earth grounding required for Liebert units. 14-4AWG wire range, 14-10AWG – 20 in-lb, 8AWG – 25 in-lb, 6-4AWG –
35 in-lb.
7)
FIELD SUPPLIED 120V CONTROL POWER – Terminals for the connection of a field supplied 120V 10A control power to feed the
equipment controls. 22-8AWG wire range, 14.2lb-in tightening torque.
8)
EARTH GROUNDING CONNECTION FOR FIELD SUPPLIED 120V CONTROL POWER – Terminal for field supplied 120V earth
grounding wire. Earth grounding required for Liebert units. 14-4AWG wire range, 14-10AWG – 20 in-lb, 8AWG – 25 in-lb, 6-4AWG –
35 in-lb.
NOTE: Items 5 and 6 may not be present if Unit supplied 120V utility option is selected.
NOTE: Items 7 and 8 may not be present if Unit supplied 120V control option is selected.
DPN004960
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ELECTRICAL FIELD CONNECTIONS
DP400/500 DEFINITIONS AND LOCATIONS
SINGLE POWER INPUT
REV : 0
REV DATE : 4/29/2019
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