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9 S+ {8 r2 z, P9 r* H4 L7 OV1,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。
1 c4 o( b8 }! T [/ LNote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V8 F! b! d, Q$ h9 J9 P% b
peak when secondary terminals are interconnected, if the following conditions are met:4 v$ a, x) B" }6 g% d- |( J
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
; Z+ S6 Z7 U+ n4 a, W$ Care made between secondary terminals and; K% n4 K# b0 ?8 A$ }/ O
b) The transformer is marked in accordance with Clause 17.4.2
; X0 |1 h) V4 y5 m, c& U" R9 K1 M! e! F
17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output1 g U6 a' T7 ?
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified: b3 F% {( {8 z q- a5 a) l' u. F
in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word
1 l4 |) z! h9 H5 I″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect$ B5 J$ i* l$ R" L+ T& N5 w2 }. s2 R
secondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The
9 W2 F( R0 X/ s) z5 Q; Nremaining letters shall be not less than 1.6 mm (0.063 in) high. |
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