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V1,V2满足有效值30V,峰值42.4V,但互联后,V3,V4就有效值和峰值都超了。(不互联 就V3 V4也不超),看到27后面有一行,就以为是可以豁免这种V3,V4互联超限值情况。
% y3 I0 D- m: F0 A8 mNote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V
! |& k" Z' u) Ppeak when secondary terminals are interconnected, if the following conditions are met:& d+ ]9 x/ d' z
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
) V. q: D# I! A$ J" N& ~! Dare made between secondary terminals and
' u; A; t- t7 R; Z" ^b) The transformer is marked in accordance with Clause 17.4.2* Y( p+ q) N K0 `1 ?' ^. n# t
) O7 H9 |# Y2 m& D2 e4 h
17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output$ r3 E: @! O( ?( z. V( F
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
+ ~1 C' P* @) u9 |in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word4 F( B2 Y1 {( r( D, G" E
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
' G7 M* w' N+ D- E |+ Hsecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The
8 {+ p! ^2 i9 o; B6 H9 A+ a! Zremaining letters shall be not less than 1.6 mm (0.063 in) high. |
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