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17 Overload protection of transformers and associated circuits
3 A: T0 A4 }% o8 ^( h- l7 P7 HAppliances incorporating circuits supplied from a transformer shall be constructed so that in; E( {& Y0 z0 u( I' c# l, P! X
the event of short circuits which are likely to occur in normal use, excessive temperatures do. {; i H% z4 b* ]9 u! C) y+ {
not occur in the transformer or in the circuits associated with the transformer. v. O/ ~+ p5 f u
NOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits
$ t; B9 ]; @% C2 U2 Moperating at safety extra-low voltage.
+ G4 v D9 l4 K! P, [Compliance is checked by applying the most unfavourable short circuit or overload which is4 f9 M9 Q; E9 d8 O9 k( l/ X; p
likely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated7 e% C- u5 L9 d* I$ H& F
voltage, whichever is the more unfavourable. Basic insulation is not short circuited.0 k" s& S, J- D
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特殊标准好像有补充 |
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