请大神指教怎么理解60335-1:2020以下章节，为什么PTC需要除外。
请大神指教怎么理解60335-1:2020以下章节，为什么PTC除外，谢谢5.12 For heating elements with appreciable positive temperature coefficient of resistance, other than PTC heating elements, the supply voltage is determined by supplying the appliance at rated voltage until the heating element reaches its operating temperature. The supply voltage is then rapidly increased to the value necessary to give the power input required for the relevant test, this value of the supply voltage being maintained throughout the test.
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