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17 Overload protection of transformers and associated circuits
' b, Y2 `/ D! d/ zAppliances incorporating circuits supplied from a transformer shall be constructed so that in) N- i1 t) X) I. e0 A2 g6 d% C
the event of short circuits which are likely to occur in normal use, excessive temperatures do
3 O, v4 G' J- h& ~- Dnot occur in the transformer or in the circuits associated with the transformer.* o5 L. d- W: A: s2 w
NOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits
4 t9 M- C, G( g& o! loperating at safety extra-low voltage.
+ V& s3 \7 d4 j" k& @% y5 I, r- |Compliance is checked by applying the most unfavourable short circuit or overload which is
8 u6 {: X2 Z$ p' z9 h. Nlikely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated3 J7 }; z9 \3 Q% Q
voltage, whichever is the more unfavourable. Basic insulation is not short circuited.# Z, y; s7 \' u: B! I: K
7 X) X9 |+ \" k: r @4 Z1 [2 @$ T5 ]
特殊标准好像有补充 |
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