谁可以比较详尽地解释这两段话？
IEC 60335-1cl 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 throughtout the test.
NOTE In general, the temperature coefficient is considered to be appreciable if, at rated voltage, the power input of the appliance in cold condition differs by more than 25% from the power input at operating temperature.
cl 5.13 The tests for appliances with PTC heating elements are carried out at a voltage corresponding to the specified power input. When a power input greater than the rated power input is specified, the factor for multiplying the voltage is equal to the square root of the factor for multiplying the power input. 可以参考GB4706.1的相关条款：
对于PT C电热元件以外的有明显正温度系数电阻的电热元件，其电源电压的确定是通过按额定电压给器具供电，直至电热元件达到工作温度。然后，让电源电压迅速增加到需给出有关试验所要求的输人功率的那个值，在整个试验中应一直保持该供电电压值。
注：一般来说，如果在额定电压条件下，器具在冷态下的输人功率与其工作温度下的输人功率相差超过25%，则认为此温度系数是明显的
5. 13 带PTC电热元件的器具，在与规定的输人功率相对应的电压下进行试验，当规定的输入功率大于额定输人功率时，用来乘电压的系数等于用来乘输人功率的系数的平方根。 第一段话的意思就是说带明显温度系数电热器具的测试,如果标准某处(NORMAL HEATING)说要在额定功率的基础上乘某个系数,这个时候应该是先在额定电压下,让器具正常发热稳定后,再改变电压使其功率达到标准要求;
第二段话的意思是相对于PTC这类特殊的器具来说,如果标准规定功率系数,此时可以调整电压系数(为功率系数的开平方根);
我的大概这样,希望能有人补充或指出问题 一楼的估计是用GB里的原话复制上来的，这样没有多大的意思哦
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