4.1 Installation cautionsRefer to the information found in 2 Important Information(page 7) before installing the product.CAUTIONR Always connect power cables to the appropriateconnection terminals. Incorrectly connecting thepower cables may damage the power supply unit.R To prevent the power cables from disconnecting andto prevent electric shock, secure the power cablesusing the included cable binders and attach the cablecovers.R If the wiring passes outdoors, use a conduit and asurge protector.R If the wiring passes underground, use a conduit, anddo not make any connections underground.R Install the product securely adhering to theinstructions in this document to prevent it from fallingoff the wall. Avoid installing onto low-strength walls,such as gypsum board, ALC (autoclaved lightweightconcrete), concrete block, or veneer (less than18 mm thick) walls.4.2 Installing the power supplyunit (sold separately)Required items– Power supply unit (VL-PS240 or VL-PS2410; soldseparately)– Cable binders (included with power supply unit)– Screws (included with power supply unit)– Wires for AC and DC connection (user supplied)See "4.6.2 Wire type and maximum wire length(Page 39)".Installation locationR The device must be installed inside an electricalpanel or cabinet.R A readily accessible disconnect device shall beincorporated external to the equipment.The external disconnect device must be certified, andhave a creepage and clearance distance of 3 mm ormore.Installation methodsThe following 2 methods can be used for installing thepower supply unit.– mounting on a DIN rail (user supplied)– attaching directly to a wall204. . Installation4. Installation