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$ \. `* r1 f2 M6 M4 N% @4 N+ tV1,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。$ l) @/ F5 M7 E, m& [' X6 u
Note: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V
9 {# V' d8 s5 D' L' Fpeak when secondary terminals are interconnected, if the following conditions are met:
: b' a" i( p7 v7 @8 ?! sa) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections' Z( A, I, h( S9 \9 ]+ V
are made between secondary terminals and1 c$ n4 z, {2 D1 X
b) The transformer is marked in accordance with Clause 17.4.2: w. [. t1 T& F1 b
% G9 R; z9 W- |& b
17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output1 z V( s/ I6 d* Z( }$ w* d. R
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
' E5 X- `( X1 B0 J! c! [; y4 S" }9 M9 |7 Hin Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word7 }1 l4 x* r6 m! x5 }
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect, H0 N b# n, Q0 ]/ i$ q
secondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The
* Q+ f9 D9 ~% h- M- B( Premaining 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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