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5 G" C7 M! k4 r( }- u. 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。
% o, Q( ~7 s& i9 T/ J4 RNote: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V* d+ P! C( W: y( O8 M- p
peak when secondary terminals are interconnected, if the following conditions are met:
- z# ~) q5 J: Y( Ta) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
4 C; ]+ T. x- R* \4 Q2 \! Bare made between secondary terminals and) o7 z" f9 V3 x7 a
b) The transformer is marked in accordance with Clause 17.4.2, w1 V; M; ]: V2 E& q: t& l6 x" v
! Y' M6 g% [5 {2 ]* z, J, k17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output1 p% Z# h5 _7 i! w0 i* F$ F4 o9 J
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified/ G5 _, I& E) n/ k0 t% o( f8 L$ K
in Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word
4 }6 a, F( P9 t4 d4 e( n* z2 k″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
) b) L! l% j4 B) B( usecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The( n- U1 F. \' i6 E
remaining letters shall be not less than 1.6 mm (0.063 in) high. |
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