Figure 11. UPS power cable terminals for single phase units1 X1: rectifier input L1 7 X3: UPS output L2 X1: rectifier input L2 8 X4: external battery cable +3 X1: rectifier input L3 9 X4: external battery cable –4 X1: bypass input N 10 PE5 X2: bypass input L 11 TB20, external battery trip6 X3: UPS output NNOTE: External overcurrent protection is not provided by this product, but is required by codes. Refer toTables 10: Minimum recommended multi-core cable and fuse sizes for rectifier and bypass input and UPSoutput cables (3 phase input, 3 phase output models), 11: Minimum recommended multi-core cable andfuse sizes for rectifier input, bypass input and UPS output cables (3 phase input, 1 phase output) and 12:Minimum recommended multi-core cable and fuse sizes for rectifier and bypass input and UPS outputcables (1 phase input, 1 phase output) for wiring requirements. If a lockable output disconnect is required,it must be supplied by the user.CAUTIONTo reduce the risk of a fire, connect only to a circuit that is provided withmaximum input circuit breaker current ratings in accordance with the nationaland local installation rules.The line-to-line unbalanced output capability of the UPS is limited only by the full load per phase currentvalues for AC output to critical load shown in Tables 15: Rated and maximum currents for rated power andvoltage (93PS), 16: Rated and maximum currents for rated power and voltage (91PS 3:1) and 17: Ratedand maximum currents for rated power and voltage (91PS 1:1). The recommended line-to-line loadunbalance is 50% or less.Source protection for the AC input to bypass must suit the characteristics of the load and take into accounteffects such as inrush or starting current.EATON 91PS/93PS UPS USER’S AND INSTALLATIONGUIDEP-164000672 - 005 2023 www.eaton.eu 3377