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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。& q" o1 t1 G. W+ {! b! D3 F$ {' }
Note: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V; E, u5 P0 m% h/ F
peak when secondary terminals are interconnected, if the following conditions are met:7 Z% a; M% L$ i2 b3 o+ |) l6 W5 g
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
0 J0 v, |* y7 T0 A: Tare made between secondary terminals and" W9 I9 B" R) _
b) The transformer is marked in accordance with Clause 17.4.2
: u% z& j$ y, @/ n! D$ H1 Q/ o& R+ F w5 J
17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output, I/ X: I$ Z' b
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified F; T# D: G* }3 D9 t
in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word) q; c5 Y( I0 i' D
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
6 U9 D' q3 N& W# i F& T9 gsecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The/ Y# y% `6 \# R" ~1 w8 _) R
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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