REV : 1
REV DATE : 6/18
DPN004336
Page :1 /5
AUTOMATIC TRANSFER SWITCH ENCLOSURE
Form No.: DPN001040_REV4
ELECTRICAL FIELD CONNECTIONS
LIEBERT DSE
STANDARD ELECTRICAL CONNECTIONS
1) High voltage entrance A – 2.5” (64mm) Trade size hole (3” hole diameter) to be located on top left
side of box. Use strain relief provided by factory. It is recommended that high strand cable be used and
no holes be added to the top of the box.
2) High voltage entrance B - 2.5” (64mm) Trade size hole (3” hole diameter) to be located on top right
side of box. Use strain relief provided by factory. It is recommended that high strand cable be used and
no holes be added to the top of the box.
3) Three phase electrical service A - Terminals are on top of disconnect switch. Three phase service not
by Liebert.
4) Three phase electrical service B - Terminals are on top of disconnect switch. Three phase service not
by Liebert.
5) Earth ground A – Dual Terminals for field supplied earth grounding wire. Earth grounding required for
Liebert units. Each terminal is rated for 6AWG – 350MCM wire.
6) Earth ground B – Dual Terminals for field supplied earth grounding wire. Earth grounding required for
Liebert units. Each terminal is rated for 6AWG – 350MCM wire.
7) Automatic Transfer Switch disconnect switch and Main Fuses A – Access to the high voltage electric
panel compartment can be obtained only with the switch in the “off” position. Fused disconnects
(100kAIC minimum SCCR) are provided with a defeater button that allows access to the electrical panel
when power is on.
NOTE: Refer to specification sheet for total unit full load amps, wire size amps, and max overcurrent
protective device size.
NOTE: The electrically commutated (EC) motors included in the Condenser section are suitable for
connection to power supplies with a solidly grounded neutral or high resistance to ground or corner ground.
8) Automatic Transfer Switch disconnect switch and Main Fuses B – Access to the high voltage electric
panel compartment can be obtained only with the switch in the “off” position. Fused disconnects
(100kAIC minimum SCCR) are provided with a defeater button that allows access to the electrical panel
when power is on.
NOTE: Refer to specification sheet for total unit full load amps, wire size amps, and max overcurrent
protective device size.
NOTE: The electrically commutated (EC) motors included in the Condenser section are suitable for
connection to power supplies with a solidly grounded neutral or high resistance to ground or corner ground.
9) Display Observation Window – Contains Automatic Transfer switch control pad.
10) Locked Access Handle – Requires key to open.
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