28 | Installation4 Optional. If you are daisy-chaining the REPO function with another UPS, you can shut down theentire system using a single switch.Connect the second REPO connector to the REPO port labeled OUT.NOTE: A separate contact must simultaneously cause UPS input AC power to be removed.5 Connect the switch or circuit to the REPO connector on the UPS rear panel using insulated0.75 mm2 –0.5 mm2 (18–20 AWG) wire.6 Optional. If you are daisy-chaining the REPO function with another UPS, connect the REPO portlabeled OUT to the REPO port labeled IN on the next UPS.Continue for each UPS. On the last UPS in the daisy-chain, connect a REPO connector (without ajumper) in the REPO port labeled OUT.7 Verify that the externally-connected REPO switch is not activated to enable power to the UPSoutput receptacles.8 Continue to the following section, “Hardwiring the UPS Input.”Hardwiring the UPS InputWARNING: Risk of electrical shock. Only qualified service personnel (such as a licensed electrician) shallperform the electrical installation.The Dell Online Rack hardwired models require a dedicated branch circuit that meets the followingrequirements: Protection device requires a two-pole disconnection device between the UPS input and the mains(see Figure 19) Breaker must be wall-mounted and be readily accessible to the operator For Europe. Breaker must meet the IEC/EN 60934 standard and have a contact air gap of at least3 mm 200–240 Vac Single-phase 50/60 Hz Flexible metal conduit (recommended for ease of service and maintenance)