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jsspace 发表于 2014-7-2 10:56 / v2 X" Z( d8 d/ i8 @
次级不能接地,这个在61347-2-13上已经明确说明了 * E- Z$ h4 _/ C+ a# H: J
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?+ Y0 F# c w) X, J/ u+ G8 `4 s
: E: C8 N# s! }: n' W( M% N( g4 n8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if* L/ D M0 l& ]4 ] Q
– the rated output voltage for constant voltage control gear or maximum output voltage for _& @4 V) Z% B1 y2 a1 `
constant current control gear under load does not exceed 25 V r.m.s.;6 a. s+ f8 o: G* I; v! P3 A8 ?& _3 h
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed! w6 J" p: R% S V0 b. n6 Z2 t- @
33 2 V.' l8 N& x( K4 b ^) e7 j
Compliance is checked by measuring the output voltage when steady conditions are
- _0 V8 X& @7 A" p5 D( A7 q' Vestablished, the controlgear being connected to rated supply voltage and rated frequency. For; G+ ^4 }* E/ Q! [9 m
the test under load, the controlgear is loaded with a resistance which would give rated output! R7 h( I$ U6 R- w' N& k% I! l- {
at rated output voltage.. A0 E B" a/ ~: G: a, p2 N
For controlgear with more than one rated supply voltage, the requirement is applicable for
# V# T; ~5 X- }, M& _+ z& seach of the rated supply voltages.$ V4 ^/ f5 i. M3 O" a: F6 ^
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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