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17 Overload protection of transformers and associated circuits; |+ V1 v& }, k" K& ]$ u2 P
Appliances incorporating circuits supplied from a transformer shall be constructed so that in
# M. U+ }- I. O* Y* Qthe event of short circuits which are likely to occur in normal use, excessive temperatures do
2 W. k* {# N. p0 J1 T0 C3 G9 nnot occur in the transformer or in the circuits associated with the transformer.
, A$ P# \" v3 q. x$ wNOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits
$ B' W0 S, W/ t# b7 Noperating at safety extra-low voltage.
7 E# z+ W. {- C. G- x% |Compliance is checked by applying the most unfavourable short circuit or overload which is
4 ?6 \! m! N3 e" ^2 j4 _: T9 Mlikely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated9 J8 d) |% O ~; ^2 R; U# w
voltage, whichever is the more unfavourable. Basic insulation is not short circuited.
0 Z2 S, t& n4 |) w; T( A- O9 B. z4 w; O$ W
特殊标准好像有补充 |
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