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|  DSH 447; }4 t+ i7 j) l5 O3 L
" ]. s r7 a! f* g% [& G
| Disconnect device# W# `& \$ P# E6 M; S
| 3.4.6
3 p# _! @3 ?: ?) }8 i% t | 60950-1(ed.1)
, ]; b/ ~4 d+ z e% j |
) @* M( z3 l( Y
Standard:
3 D0 A, M0 \# N: L& ?# ZIEC 60950-1:2000, 1st ed9 {" d. o: y8 }* q% |# C
Clause:$ f4 V$ s# V2 L% T
3.4.6
( Z. Q2 f( M+ l+ X9 dSheet No.
( B) |* x: @9 o$ b4 @4478 ~5 u4 N$ t0 [8 F. w. L: s8 k
Subject:
4 e9 N+ v% U( M$ ]Disconnect device4 L% F" r8 Y6 g' j/ E8 u
Key words:
6 m6 Q+ n, Y. G8 _DC mains supply
4 g- ^" ]1 ^# \* F/ N! A) sDecision taken at the
+ V- p" m! b" e* q" I: |, X; h40th meeting 2003
" ?( f& G2 [: n+ h4 \Question:8 N& h a6 `' K2 E* s# V
Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.3 m/ V' z9 V7 T
The power supply is 40 m far from end use equipment which contains above mentioned unit.
$ B6 |; `3 [6 S) ~2 da) Do other test houses require disconnect device for such DC supplied unit?% p4 i8 L9 r+ j4 h- ]6 o5 [
b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is
& Y b# b. B3 X9 \8 U' Ronly 24 Vdc.
2 o7 {% P+ W& U8 a( S+ _0 p4 [1 v/ VDecision:( h3 l6 T1 F5 M8 r4 ^/ Z
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
- P6 ?0 O: f3 I+ vmains supply for servicing.
( o0 t+ K" f8 i$ }/ M# m" a(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).
8 c6 ^1 n( Q9 [b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact5 S8 J3 e$ [# r; g8 c$ L8 V6 g9 e
separation equal to the clearance for basic insulation.0 S* {' R- n V2 I. ~
9 _* n% ^, ^5 k2 G8 g/ T! X
) ?$ i% \( P. X, h5 O
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发表于 2012-11-6 16:52
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