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5 D( H2 S. E7 SV1,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。
! t. | ^. ?' _3 z4 P5 UNote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V
2 d& u: Q2 j8 apeak when secondary terminals are interconnected, if the following conditions are met:
5 m! C! h4 _3 ?5 A7 ?a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
3 _2 Y* b% y3 j+ k! ^are made between secondary terminals and
0 J& }! `4 C* z( T1 Ob) The transformer is marked in accordance with Clause 17.4.2
2 ]( t, z# m4 q# t) I2 Y, G6 `
- i$ e; T6 \) _1 n2 `17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output
+ h B! m7 E# c: R$ Y8 t! wexceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified3 n- P& _! }6 ]
in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word
& W3 v' r, k. y7 q7 n9 k' D9 k″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect# n2 x+ o% k' v8 P; L/ O0 I
secondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The
$ g% M8 N! \& |/ \) }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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