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* T o7 z, h* l$ AV1,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。0 V# Y& X4 n* `2 |! U5 i: j& Z
Note: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V
6 V7 q( u Q7 l2 C- f- ~4 gpeak when secondary terminals are interconnected, if the following conditions are met:
, K! ~" a) K$ W1 Ha) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
7 w5 ?, _: c( W+ `* S7 m: i9 tare made between secondary terminals and, U7 @9 |7 P0 L& @
b) The transformer is marked in accordance with Clause 17.4.2
' n# P; S' Q f. Y' ^! t, `$ ~5 _: ]+ w0 v! k" A
17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output
1 t+ ^& q) `; A6 E B& `" Dexceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified0 d, o7 \ p# t/ R" ]" l s
in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word
* U5 \# d _2 j7 [″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
; U: Q7 l! ^5 E3 }, F# } Rsecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The
" A+ O! g5 Q L. S: J2 p. Uremaining 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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