|
|
本帖最后由 tsunn 于 2013-8-9 20:34 编辑 , r6 q- r( m# k) R$ s1 s
+ O1 U: Z) ?/ W各种不同的定义太累。大家有什么看法。
/ S" x" x8 Z7 V" w& \EN60335版本定义：. K! S- j0 k8 I) }+ y/ V. k
3.4.2
; T) e7 T7 x" Y$ X. Bsafety extra-low voltage
U3 I9 @, ~5 K9 Zvoltage not exceeding 42 V between conductors and between conductors and earth, the no-+ I: D K# T2 o/ n
load voltage not exceeding 50 V
% p& k |6 [$ d, dWhen safety extra-low voltage is obtained from the supply mains, it is to be through a0 t5 d0 J1 Z e5 c8 ~' a1 v
safety isolating transformer or a convertor with separate windings, the insulation of which
7 T# p6 o( W) k$ ]complies with double insulation or reinforced insulation requirements.
& U. G/ Q @: C7 V0 h2 TNOTE 1 The voltage limits specified are based on the assumption that the safety isolating transformer is) v$ K2 ?2 W. X% D* o
supplied at its rated voltage.
3 K; V) `& F3 K: u8 t+ ~ B9 M2 c) ANOTE 2 Safety extra-low voltage is also known as SELV.
7 M: |: K8 t. W" o- L1 d
1 R! W- |) z5 W3 [$ f1 P8 X4 F6 k5 R* H" u
EN60598版本定义：
& [. ~7 Y. P& S7 w( J1.2.42.2
2 G+ [& A7 A9 N, R; p8 e5 fSELV (safety extra low voltage)
" N$ `* `. T7 ]8 K/ HELV in a circuit which is insulated from the mains supply by an insulation not less than that: x# P' R n9 u! {1 C
between the primary and secondary circuits of a safety isolating transformer according to7 _5 v& c) o% u+ ^0 W: u
IEC 61558-2-6 or equivalent
3 c O% m: o$ g' Z8 v/ jNOTE Maximum voltage lower than 50 V a.c. r.m.s. or 120 V ripple free d.c. may be specified in particular
( S/ I; j# O: ?- z! s! A$ urequirements, especially when direct contact with current-carrying parts is allowed., C1 u Q: l- o* d0 P
, T1 V; A8 r' `
; w& |4 k1 ]; U: h- O! a2 o* a0 b我在网上下载了一个不知道哪个机构翻译的UL8750中文版，里面居然有SELV定义,看图（但我在英文版（2009）里没发现该定义。在UL8750里其实叫做LVLE）
* j K& p) W5 J' z& a1 r
* O. a) }( a# T' j4 D+ D# j" {' @4 q% b2 j7 `- E
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有账号？注册安规
x
|
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 )
窥视卡
雷达卡
发表于 2013-8-9 19:58
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡
楼主