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80kW InfraStruXure PDU—Operation and Configuration 7
Front view (interior)
Ground lugs—Ground lugs
are provided for the Main
Input switch, Bypass Input
switch, and Cross Tie Output
breaker. The main input lug
has two holes: one for a main
ground and one for the GEC.
See the instruction sheet,
Certified Electrician’s
Instructions for more
information.
Main Input switch (A)—
The main power source
connects to your system at
the Main Input switch. See
the instruction sheet,
Certified Electrician’s
Instructions for more
information.
Optional Bypass Input switch (B)— If you ordered a PDU that accepts input power from two
different sources, your secondary power source connects to your system at the Bypass Input switch
(Q10). The switch requires 208V input and 4-wire input conductors. The secondary source must
have its phases in sync with the main input source (A). See the instruction sheet, Certified
Electrician’s Instructions for more information.
Optional Cross Tie Output circuit breaker (X) or MCCB subfeed— You have the option of
selecting ether a cross tie or MCCB subfeed breaker. The cross tie is a 4-pole circuit breaker that
outputs 208V, 320A to a bypass input switch on a different system. The MCCB subfeed outputs
208V, 150A or 208V 225A to a bypass input switch on a different system. Either circuit breaker
allows systems to be cascaded. See “Site Planning” in the InfraStruXure 80kW Installation and
Start-Up and the instruction sheet, Certified Electrician’s Instructions for more information.
PDU monitoring unit circuit breakers—Power supplied to the PDU monitoring unit is controlled
through these two circuit breakers.
Fuses—These fuses protect the silicon-controlled rectifiers in the UPS bypass static switch. The
fuses are present only on dual-fed PDUs and single-fed PDUs without a transformer.
Optional bottom feed—If you ordered main input wiring to be routed under the floor, these
terminal blocks are your connection to the Main Input switch, Bypass Input switch, and Cross Tie
Output breaker.