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7 ~' X* `) v8 J+ [3 i. C$ E
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。
4 r0 N8 |% l) \/ a7 B1 ONote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V
8 ^4 H, r0 [& U9 _peak when secondary terminals are interconnected, if the following conditions are met:
7 U# N6 U& i" o$ Z& ea) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections: {0 Y5 Q: E5 u; q3 ]" }+ O
are made between secondary terminals and, a; P3 q9 W* l+ Z* U
b) The transformer is marked in accordance with Clause 17.4.2
6 u! J. G7 H) G* i, r: ^5 z) T
5 C- v7 Y9 @* w" N17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output. M% R% o9 H( T3 H1 ]
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
. e: j8 G' K2 o6 n% min Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word1 K7 _/ {' x+ a1 O3 C! ^: V& _6 m# q
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect+ R) [$ t W. Y8 T
secondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The) i4 i& K( h d" N0 z2 I1 S) j' {
remaining letters shall be not less than 1.6 mm (0.063 in) high. |
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