How to determine the voltage of U-shaped tubular heater?
If the U-shaped electric tubular heater has no label, it is difficult to determine the voltage. The resistance can only be measured with a multimeter, and the voltage cannot be measured. The heating tube cannot be connected to different voltages at will. If the withstand voltage of the heating pipe is 220V, it must be powered by 220V, not 380V, or it will burn quickly; if the withstand voltage of the U-shaped electric tubular heater is 380V, it can be powered by 380V or 220V, the former is rated power operation, The latter is 1/3 of rated power operation.
Of course, the insulation material between the heating wires should be considered in actual operation. Generally, the insulating material filled with magnesia inside the heating element has good insulation performance, and a voltage of several hundred volts will not affect it at all.