IEC 60950-1 问题
请问 IEC 60950-1 Clause 4.3.7 该如何理解 ?标准是要求接地的部份需要装上温度保护器吗 ?
4.3.7 Heating elements in earthed equipment
Heating elements in equipment that is earthed for safety purposes shall be protected so that,
under earth fault conditions, a fire hazard due to overheating is prevented. In such equipment,
temperature sensing devices, if provided, shall be located in all line conductors supplying the
heating elements.
The temperature sensing devices shall also disconnect the neutral conductor for each of the
following cases:
a) in equipment supplied from an IT power distribution system;
b) in PLUGGABLE EQUIPMENT supplied through a reversible appliance coupler or a reversible
plug;
c) in equipment supplied from a socket-outlet with indeterminate polarity.
In cases b) and c), it is permitted to meet this requirement by connecting a THERMOSTAT in one
conductor and a THERMAL CUT-OUT in the other conductor.
It is not required to disconnect the conductors simultaneously. 應該是沒有強制要安裝溫度保護器~~法規是建議,若是有發熱元件是建議安裝溫度保護器,以避免產生火的危險...
一般溫度保護器比較常見安裝在power supply 或adaptor中...但也不一定都有..若是溫度沒有特別高的話且也符合溫升限制是可以不裝的...
以上是個人見解,如有錯誤請導正
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