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4.6 Check Site Wiring Fault indicator - 100, 120 Vac versions Once loads are connected to the UPS and the UPS is turned on, the Site Wiring Fault indicator at the UPS's rear panel should be checked. It will illuminate when the UPS is plugged into an improperly wired wall outlet. Wiring faults detected include missing ground, hot-neutral polarity reversal and overloaded neutral circuit. Note: If the UPS indicates a site wiring fault, a qualified electrician should be summoned to correct the build