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Question:

Under the same voltage level, the rated voltage of the equipment is not exactly the same

Under the same voltage level, the rated voltage of the equipment is not exactly the same

Answer:

And some appliances have no effect. For example: switching power supply, it can work in a wide range of voltage, the output voltage remains unchanged. It should be noted that, as long as the manufacturers in the normal operating voltage range, generally will not cause the state of work and security issues, can be assured that the use of.
The rated voltage of all kinds of equipment under the same voltage level are not completely the same as normal, different appliances the maximum withstand voltage is different, the design requirements of more electrical and marked a maximum voltage of 240V, some 250V. It is different from the actual working condition under different voltage (whether ideal and safe and reliable)
For different electric appliances, rated voltage may be different, commonly used for 220V, 280V, and some appliances used in not rated voltage can still work, but not up to the ideal working condition, rated voltage and the voltage at both ends of the electric appliance has nothing to do with.

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