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2 a, R$ X+ r o/ c2 J0 SV1,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。
" k1 t" X& K" k6 t" o) PNote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V
6 ~/ l" W4 o# e6 rpeak when secondary terminals are interconnected, if the following conditions are met:# G6 m5 d- l. b! `9 ~
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections/ r6 M- m! U l4 P& v5 e$ ~, R3 a
are made between secondary terminals and
% q8 |+ I6 `% {% f: q# Zb) The transformer is marked in accordance with Clause 17.4.2
6 T6 Y: ~% T: H& O3 g
! B; W, x& _: h. i& L$ {$ x; `17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output
' W: r, E) r( R& o* e) Q2 O+ N$ iexceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
+ Z! W; [9 \/ M5 z* Rin Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word
' f& A! v# g$ t″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect u1 c+ ?, u7 n/ D7 N7 K( t' x8 r
secondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The* o# {0 }; q5 e q
remaining letters shall be not less than 1.6 mm (0.063 in) high. |
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