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( ~' @/ W% }9 W# fV1,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。& ~% U4 U. P! Z. x9 J+ Z+ d
Note: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V
' |- O! ?. O3 ]peak when secondary terminals are interconnected, if the following conditions are met:2 E: x. x+ @0 K$ x: Z1 u
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
' `! j- w, m( p- z/ o$ Q! Rare made between secondary terminals and, O, h" v/ c) b
b) The transformer is marked in accordance with Clause 17.4.26 p1 z( J1 j% I9 t2 `8 \; }
( V" H& X- U9 Z/ ^' ]$ S+ Z' f17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output5 u4 p9 f7 B% q1 Z6 ?; J
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified+ ?8 ~, L+ w- E* G( g/ D2 b
in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word
5 d! h0 N. {! _″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
9 |3 D, l( k8 u2 C3 h4 ksecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The$ F( n/ C$ w- g! G3 ?2 Z' b# B, h
remaining letters shall be not less than 1.6 mm (0.063 in) high. |
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发表于 2024-8-14 09:54
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