ELECTRICAL WORKElectrical wiring work40 EnglishWithdrawing the power cableConnect the power cable protection tube into the powersupply box. Be sure that the power supply cable is notdamaged by burr on the knock-out hole.Installing the Solution deviceF1F2OF1OF2R1R2F1 Terminal block with inverter controllerand hydro controllerF2OF1 -OF2R1 Terminal block with solution deviceR2Grounding workThe grounding must be done by a qualified installer forsafety.Grounding the power cablef The standard of grounding may vary according tothe rated voltage and installation place of the airconditioner.f Ground the power cable according to the followingtable.InstallationplacePowerconditionHighhumidityAveragehumidityLowhumidityVoltage toground is lowerthan 150 VMustperformthegroundingwork 3.Note 1)Mustperformthegroundingwork 3.Note 2)Voltage toground is over150 VMust perform the grounding work 3.Note 1) (Including the case where earthleakage breaker is installed)Note 1) About grounding work 3.f Grounding work must be done by an expert (withqualification).f Check if the grounding resistance is lower than100 Ω. When installing an earth leakage breaker (thatcan cut the electric circuit within 0.5 second in caseof a short circuit), allowable grounding resistanceshould be 30 ~ 500 Ω.Note 2) Grounding at dry placef Check if the grounding resistance is lower than100 Ω. Check if the grounding resistance is lowerthan 250 Ω.