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! n V" y3 r: x$ rV1,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。
: Y4 n* N$ w3 q2 qNote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V
# b1 \2 Q; p2 Ypeak when secondary terminals are interconnected, if the following conditions are met:- C# Y' n( I n3 n/ t
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
4 q, X% ^/ s5 c8 w0 T, Care made between secondary terminals and! X7 s/ b+ S9 ?: E2 a; V* j
b) The transformer is marked in accordance with Clause 17.4.2' }$ h7 U% H; U& N* J' |3 j6 f+ z! `
5 k* }3 P }; d& w17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output/ C# v7 |* J$ D. c y
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
@* R1 V% |2 ?( hin Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word& h6 I# ^0 e6 n. A
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
3 l, E$ U7 b3 {7 `* nsecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The) R/ e5 f8 t) U1 B) i
remaining letters shall be not less than 1.6 mm (0.063 in) high. |
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