Important Safety Information 61■ Test set■ Four rack screws appropriate to the rack (if rack mounting the chassis)Important SafetyInformationBefore you install or remove any components or perform anymaintenance procedures on the system, you must read the followingsafety information.WARNING: Verify that each NBX 100 Chassis (the one with the CallProcessor board and any expansion chassis) is set to the correct voltagefor your country requirements. The voltage is indicated on the voltageselector switch next to the main cable inlet on the front panel of eachchassis. (See Figure 24.)Figure 24 NBX 100 Voltage Selector SwitchWARNING: The system must be installed in a secure (locked) area thatcan be accessed only by trained personnel.The components and telephones of the NBX system are electronicdevices. To avoid injury and damage to the equipment, follow theseimportant safety precautions when you install, use, or service it:■ Allow only qualified personnel to install and remove the unit.■ Always connect the unit to a grounded (protective earthed) outlet tocomply with international safety and EMC standards.■ Read and understand all instructions.230 volts115 volts230115The label to the left of the voltage selectorswitch shows the 115 and 230 voltselection positions. If the incorrect voltagefor your country is set, use a smallflat-blade screwdriver to toggle the switchup or down on each chassis.The SuperStack 3 Call Processor workswith either 115 volt or 230 volt power, soit has no mechanism for changing voltage.