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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。: J3 v, h p+ s& x$ x, M
Note: The open circuit voltage between secondary terminals of a two-secondary winding transformer may exceed 42.4 V1 A5 ?& j6 n# F& ?8 J! {9 @
peak when secondary terminals are interconnected, if the following conditions are met:4 `3 f7 G/ o0 ~
a) The open circuit voltage between any two terminals is not more than 42.4 V peak when no connections
, B( V2 ~/ v6 p# C8 R& x, M9 k4 zare made between secondary terminals and1 h' |2 q/ ~: g8 r+ N/ |8 E- e/ }8 D
b) The transformer is marked in accordance with Clause 17.4.23 W* N) f3 A4 \* Z6 \8 X
" b ^$ n- Q t0 q17.4.2 A transformer with multiple secondary windings as described in Clause 4.3 having an output) }0 I, O2 A$ k+ p
exceeding 30 V rms or 42.4 V peak, or a transformer with an output current exceeding the limit specified
6 P. M8 H; J7 Z8 _0 W) p% N# w. tin Clause 28.1.1 or Clause 28.3.1, shall be marked where readily visible after installation, with the word* }' r- u2 a+ o2 e, A! I2 p- |
″WARNING″ and the following or the equivalent: ″Risk of electric shock or fire, do not interconnect
: _3 j8 T! v0 Esecondary windings.″ The word ″WARNING″ shall be in letters not less than 3.2 mm (0.125 in) high. The
% h* J; ?; `/ m& @remaining letters shall be not less than 1.6 mm (0.063 in) high. |
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