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' h0 W0 O3 c/ @: h& oV1,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。7 X" \- _1 W: G- o9 ?+ H- E
Note: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V' E1 u& b2 V3 r' r
peak when secondary terminals are interconnected, if the following conditions are met:
+ A& ]! Q, M6 P/ Ga) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
& ^6 w) J I+ e% N5 Qare made between secondary terminals and: {5 x" N8 [7 t" ]4 V% x
b) The transformer is marked in accordance with Clause 17.4.2
' W% U# K7 w- _' r' O( C+ w
" R" m* F+ O- K0 G' Z17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output* Y2 m' M5 i6 G9 e3 ^' j2 s% e9 e2 p
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified& ^) m1 p! `$ k w. x L& O5 d
in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word
8 L5 p' U: K: O2 { Z) t″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
! p$ j( a3 o E! Gsecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The# ]# S6 Y p# T
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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