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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。
: @) b, o* ?- lNote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V6 d% p# l0 c4 `" Z3 Z; \6 y( Q- y( i
peak when secondary terminals are interconnected, if the following conditions are met:
9 Z# v5 [4 o+ h, }a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections. i/ ?. U7 y2 d6 Q
are made between secondary terminals and& h$ J" L3 S% B5 L3 \8 a) B# F
b) The transformer is marked in accordance with Clause 17.4.23 K1 ?1 I& {/ D# G' m
M2 ~7 I/ F) D, R& V
17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output! h. T2 i7 h/ q `$ N: L5 R
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
% P: X4 `1 a% v7 M% G+ ain Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word
) c. G% F) C, z) b″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
4 `5 B" H& w5 @( J- psecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The
) G: E( A) C5 u# uremaining letters shall be not less than 1.6 mm (0.063 in) high. |
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