CAUTION: Risk of electric shock. Can cause property damage, injury and death.
The Liebert AC4 is designed for use on properly grounded (earthed) 24VACpower, 50Hz or
60Hz. The ground wire for the power lead must be wired to the earth ground terminal (stud
located next to the 24VAC terminal block).
This equipment is intended to be installed by a qualified and certified electrician who must
review and approve customer supplied wiring and circuit breakers, verify correct input and
grounded (earthed) connections to ensure compliance with technical standards and national
and local electrical codes.
WARNING! Risk of electric shock. Can cause property damage, injury and death.
Be sure that the Power On/Off switch is set to OFF before installing any wiring to this unit. The
switch is in the top left corner of the unit, just below the battery pack.
To connect electrical power:
1. Run conduit and electrical wiring from building to the Liebert AC4.
2. Use copper wires only; proper wiring to use for power is 18-22 AWG stranded and shielded
(18AWG is recommended—see 3 on page21). Strip wires 1/2".
Figure 2.2 Electrical connections to panel
3. Secure the incoming electrical service wires to the Liebert AC4’s 24VAC input by sliding the
wires into TB7, the 24VAC input terminal block. There is no polarity requirement when
connecting to TB7. The ground wire must be connected to the earth ground terminal located
on the side of the panel (see Figure 2.2 above).
Vertiv | Liebert® AC4 User Manual | 19
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