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9 C6 g* q5 E9 J$ {. ~3 O+ bV1,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。
$ J1 B1 c; V: I7 i6 ANote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V: s5 e. H% y p
peak when secondary terminals are interconnected, if the following conditions are met:3 Z5 E' M" u4 P6 B$ i% ~
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
+ e& z! u; H4 c* f9 L* G, }are made between secondary terminals and) W8 g& ]. }% m4 A1 @
b) The transformer is marked in accordance with Clause 17.4.2
/ d! C2 Q3 q& }1 f- D& j; k7 g2 H; v
17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output2 g3 C8 w4 w2 m% N. ]$ Q" X
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified# I% z: }# w% q) j& c( n8 Y D
in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word2 ~2 A5 a& `3 j0 _: G8 }) r
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
. j9 f, f( t6 v0 F2 k# U% @secondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The3 h" z# y# y, M( ?; |
remaining letters shall be not less than 1.6 mm (0.063 in) high. |
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