1Preparing for installationH3C WX3500H access controllers include the following models:• WX3508H.• WX3510H.• WX3520H.• WX3540H.Safety recommendationsTo avoid any equipment damage or bodily injury, read the following safety recommendations beforeinstallation. Note that the recommendations do not cover every possible hazardous condition.Safety symbolsWhen reading this document, note the following symbols:WARNING means an alert that calls attention to important information that if not understood orfollowed can result in personal injury.CAUTION means an alert that calls attention to important information that if not understood orfollowed can result in data loss, data corruption, or damage to hardware or software.General safety recommendations• Make sure the installation site is flat, vibration-free, and away from electromagneticinterferences. Make sure ESD and anti-slip measures are in place.• Do not place the device on an unstable case or desk. The device might be severely damaged incase of a fall.• Keep the chassis and installation tools away from walk areas.• Keep the chassis clean and dust-free.• Do not place the device near water or in a damp environment. Prevent water or moisture fromentering the device chassis.• Ensure good ventilation of the equipment room and keep the air inlet and outlet vents of thedevice free of obstruction.• Make sure the operating voltage is in the required range.• Use a screwdriver to fasten screws.• After you move the device from a location below 0°C (32°F) to the equipment room, follow theseguidelines to prevent condensation:{ Wait a minimum of 30 minutes before unpacking the device.{ Wait a minimum of 2 hours before powering on the device.Electrical safety• Carefully examine your work area for possible hazards, such as moist floors, ungroundedpower extension cables, or missing safety grounds.