3.6 Hardwired Input/Output Connections
WARNING! Risk of electric shock. Can cause equipment damage, injury and death. Before beginning
installation, verify that all external overcurrent protection devices are open (Off), and that they are locked-
out and tagged appropriately to prevent activation during the installation, verify with a voltmeter that power
is Off and wear appropriate, OSHA approved personal protective equipment (PPE) per NFPA 70E. Failure to
comply can cause serious injury or death. Before proceeding with installation, read all instructions. Follow all
local codes.
Table 3.1 below lists the four types of I/O connection are available depending on the UPS model. Some models offer more
than one type.
Model Lines in/out Configuration
5 kVA, 6 kVA 1-in 1-out Common source
8 kVA, 10 kVA 1-in 1-out Common Source or Split bypass
16 kVA, 20 kVA 1-in 1-out or 3-in 1-out Common Source or Split bypass
Table 3.1 I/O Connection Types by Model
3.6.1 Branch Circuit Breaker
The installer must provide an upstream branch circuit breaker, see Table 3.2 below, for the ratings. The input circuit breaker
on the distribution box and the output circuit breaker on the rear of the power distribution box disconnect all power between
the main cabinet and the distribution box. Table 3.4 on page44 shows a diagram of the circuit breakers.
Observe the following guidelines and specifications when making the hard wire input and output connections:
• Provide circuit breaker protection according to local codes. The mains disconnect should be within sight of the
UPS or have an appropriate lock out.
• We recommend using a Class D circuit breaker.
• Maintain service space around the UPS or use flexible conduit.
• Provide output distributions panels, circuit breaker protection, or emergency disconnects according to local
codes.
• Do not install input and output wiring in the same conduit.
Unit Rating Recommended Breaker Rating
750 VA
10 A1000 VA
1500 VA
2000 VA 16 A
3000 VA 20 A
5 KVA 40 A
6 KVA 50 A
Table 3.2 Branch Circuit Breaker Rating
3 Installation Proprietary and Confidential ©2024 Vertiv Group Corp. 37
Vertiv™ Liebert® GXT5 UPS Installer/User Guide
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