Eaton Ferrups FX - Chapter 4 Electrical Installation; UPS Hardwired Installation; Recommended Breaker And Wire Sizes

Eaton Ferrups FX UPS P-164000906 Eaton Ferrups FX User’s Guide P-164000906—Rev 05 11
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Risk of electrical shock. Only Qualified service personnel (such as a licensed electrician) should perform the
electrical installation in this section.
Hardwired UPS Installation
Most of the sections in this manual are required for the electrician to install the hardwired models
If a bypass switch is not used, the UPS input may be hardwired through conduit to a main power source circuit
breaker, and the UPS output may either be hardwired to a circuit breaker in a distribution panel. Without a
bypass switch, power to the load cannot be maintained if the UPS is taken completely offline.
• Be sure to read section 1.1 “Safety Warnings” before installing the UPS as stated .
• Complete section 3.1 “Location Requirements” .
• Continue to section 4.1 “UPS Hardwired Installation” which describes the electrical installation
requirements for hardwiring the UPS.
• Continue to section 8.1 “Startup For Hardwired Units” in the Eaton Ferrups FX series UPS users guide for
units that do not have an external bypass switch.
• “ ” and “” describe the recommended breaker and wire size for installation of the Eaton Ferrups FX series
UPS.
• If you purchased a external battery cabinet see section 5.1 “Preparation for Battery Installation” for wiring
connections.
• Complete the phase check as described in section 8.2 “Initial Startup for Units Installed with a BPE Bypass
Switch” .
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Table 5. Wire Size Recommendations
Model Input Voltage Input Breaker Size 75°C Copper Wire Size
FX3100 120 Vac 50A
8 AWG (8.4 mm²)