|
17 Overload protection of transformers and associated circuits) e& I8 m: Z }0 I9 p5 s
Appliances incorporating circuits supplied from a transformer shall be constructed so that in7 z# w$ H4 ^6 v7 O% |" |0 u
the event of short circuits which are likely to occur in normal use, excessive temperatures do
( Q0 x+ B7 U' C+ qnot occur in the transformer or in the circuits associated with the transformer.! o! V. v- d' [) ?! {. d* `
NOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits* Z% Z/ [: b, V8 ?
operating at safety extra-low voltage.
. B' |% ]( K* ?: w6 oCompliance is checked by applying the most unfavourable short circuit or overload which is3 _" w: c# b* k& T. q
likely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated1 Y, m- G6 @6 B
voltage, whichever is the more unfavourable. Basic insulation is not short circuited.
7 n- O) ~$ ^4 L+ V6 s. d/ f" [, N; n- N; H7 l
特殊标准好像有补充 |
|