|
|
jsspace 发表于 2014-7-2 10:56 ' S( O# M* \! T& q1 b& _6 r+ z
次级不能接地,这个在61347-2-13上已经明确说明了
* G' s9 t; I+ j( e. e5 E依据IEC61347-2-13 Clause 8.2, 满足条件的SELV都可以被人接触到,为什么不可以接地?
/ X R. ?2 D4 J& V( R/ P) z& x+ B9 V& ~
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if( y2 A( X! q2 S
– the rated output voltage for constant voltage control gear or maximum output voltage for# B& d2 C7 p5 Q$ _; r( @: G! }) u7 `
constant current control gear under load does not exceed 25 V r.m.s.;
: [2 N# \2 M+ W' \9 F( D– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed" t+ S" L/ L7 p" b8 e
33 2 V.
, X& R9 O* [& CCompliance is checked by measuring the output voltage when steady conditions are
$ `# y0 o1 ^8 F- A' z. nestablished, the controlgear being connected to rated supply voltage and rated frequency. For% n3 \7 m3 ~# o0 F8 |6 ?
the test under load, the controlgear is loaded with a resistance which would give rated output" X. `; A* x3 D7 d- q' S
at rated output voltage.
" I o" B% w% |" jFor controlgear with more than one rated supply voltage, the requirement is applicable for
1 X6 ]4 X2 G! \0 O& |) Feach of the rated supply voltages.
0 b" B) {6 {9 k1 k/ zControlgear with a rated output voltage above 25 V shall have insulated terminals. |
|