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3 F0 W6 Y7 u1 I) rV1,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。$ Y! i d3 m2 O5 G9 c1 ?
Note: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V- o5 k) ~" I! n8 T0 ]. c
peak when secondary terminals are interconnected, if the following conditions are met:6 ?5 T5 r# L5 ]0 Q. R3 e
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
% i( X+ N" G# Q. R% r1 B0 u0 f1 yare made between secondary terminals and O. [+ N2 b% [/ N" Y, K/ U- m
b) The transformer is marked in accordance with Clause 17.4.2+ x5 }4 _% i& U+ P. z8 I
# U8 k9 D2 ?4 Y( I$ `17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output
& d$ |$ [8 o9 }) [exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
! H/ \5 I9 ]1 U% c8 j- k& Sin Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word1 c' Q' s" Q( y$ g& a, `5 D
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect1 x7 m# _5 k8 b5 V; a- t) b
secondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The
: [ n+ U+ `! _4 T1 N" Zremaining letters shall be not less than 1.6 mm (0.063 in) high. |
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