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3 H" R- Y; `* K* D1 m8 h. U4 {Standard:
8 F, m8 [) B- f( V4 {$ UIEC 60950-1:2000, 1st ed, D2 K* o% i/ F2 `! f9 y5 k% ~
Clause:8 |- b5 T R! a$ Y' ^6 N8 p3 p6 K5 e& T
3.4.6
# P$ u9 C9 H9 Y" z) TSheet No.
" G7 f( E" ?5 D: Z+ }447
* p! M$ N# ^( ]6 ? n" D5 H2 @7 n6 GSubject:
, b" ~& [5 e5 A5 N$ ZDisconnect device
: u) Z& G5 J$ z+ J0 t. t0 g) CKey words:' R8 F6 m4 |8 U: C& O$ I
DC mains supply/ n" }6 f6 i0 r
Decision taken at the
+ @6 y. k6 |0 _' Y' y1 G, o40th meeting 20035 l: G& P: K; Z3 s' ^
Question:- o n* H# i$ `
Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.
0 V0 D! t4 o9 x! p( EThe power supply is 40 m far from end use equipment which contains above mentioned unit.
3 W( W/ v/ @8 U ?7 l2 Ra) Do other test houses require disconnect device for such DC supplied unit?
; O+ J( Y8 M4 H$ F- ^b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is- Z! p5 l; p+ w" n* o9 S+ O9 J6 D% V
only 24 Vdc.: C7 w M i B7 U8 o
Decision:1 @( b5 n/ _ R! y/ D
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
5 Z- r0 Y3 X, q+ k" Rmains supply for servicing.
: \7 I( i5 b1 }( @ {3 h9 H$ ?(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).: @$ h# S# V& p e
b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact- k+ I, r4 y9 C! M* A# j5 B
separation equal to the clearance for basic insulation.1 @1 m3 ~( J( |3 v( \
! \" y/ k: d' ?) `% E# n, d+ p7 Q; [5 A
+ \, X7 T9 P; Z% ] |
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发表于 2012-11-6 16:52
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