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Chapter 4 Prerequisites for the UPS installation
Recommended protective devices and cable cross-sections
Recommended upstream protection
Table 1: Using standard Circuit breakers
UPS Model
5594-8KX
8 kVA, single phase
5594-9KX
11 kVA, single phase
5594-8PX
8 kVA, three phase
5594-9PX
11 kVA, three phase
Using an RCD
It is strongly recommended to not use an upstream RCD device to protect the UPS unit due to
the potentially high leak current that can occur!
For additional information see also the section
When using a Residual Current Device (RCD), also referred to as Residual Current Circuit
Breaker (RCCB) or differential Circuit Breaker, it must have a leak current rating of 420 mA.
Attention! A RCCB must be tested once a year with the integrated test button in order to
ensure that it is working properly.
RISK OF VOLTAGE BACK FEED.
The system has its own power source (the battery). Isolate the UPS and check for hazardous
voltage upstream and downstream during lockout-tagout operation. Terminal blocks might be
energized even if the system is disconnected from the AC power source.
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
Normal and bypass
AC inputs not
separate
Normal AC input
D curve, 50 A
D curve, 70 A
D curve, 50 A
D curve, 70 A
Separate normal and bypass AC inputs
Normal AC input
D curve, 50 A
D curve, 70 A
D curve, 20 A
D curve, 70 A
"Important
considerations" in this chapter.
Bypass AC input
D curve, 50 A
D curve, 70 A
D curve, 50 A
D curve, 70 A
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