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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。! o! c' q& B8 \, Y! K) E
Note: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V0 |3 q$ r; W/ W! u
peak when secondary terminals are interconnected, if the following conditions are met:) A/ }' w3 o% `! @8 Z- ?9 }6 y
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
6 Q F9 S! l7 K+ kare made between secondary terminals and3 o, R' f3 l2 T: H2 k0 H. g J
b) The transformer is marked in accordance with Clause 17.4.28 L! ?: C. h7 H9 m- z
5 w, _, S0 V8 F7 y
17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output: ]* w% _8 H# n
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
" T& a/ I, ?( k! ]in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word* n) N8 t; [; d+ M
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
9 c( G; M; D# a/ j# E# lsecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The2 k% `) p+ Q" h; T1 p
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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