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4 z1 ]" y' x( k5 w1 S! f, Z) {, BStandard:: g, }9 O* A* E- L v5 W' m
IEC 60950-1:2000, 1st ed
* x/ P- j2 L. i" j3 ?Clause:$ d) p; ~8 j z$ h, V
3.4.6& _; }+ w8 O8 g" {% Z) i/ I
Sheet No./ m9 ?- v2 t4 a3 G/ a
447! }2 r v6 P! y$ L
Subject:3 c, v) q* j/ o6 w- s
Disconnect device1 D$ h7 T. S1 ~
Key words:* d9 |# P4 z i. C
DC mains supply0 j+ e7 K9 C K
Decision taken at the
' w# ^4 ~3 ?2 Y6 C+ k40th meeting 2003+ n' B: @+ X+ b# T
Question:
9 Q2 }1 I. X- H. e0 N; `# p* AEquipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A." H7 I6 i+ L( c2 u0 Q% d7 H* ^
The power supply is 40 m far from end use equipment which contains above mentioned unit.1 A4 M* e7 J$ T
a) Do other test houses require disconnect device for such DC supplied unit?
: P+ e" n$ v8 y$ gb) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is
: ?7 d% F+ h, D, C3 eonly 24 Vdc.
$ k5 X" G% m, s5 `$ kDecision:
( t8 i" \4 g7 U% H9 na) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the& @ h! V* {, X# f/ I# V' s
mains supply for servicing.4 |& f) p2 u6 r1 }/ W( M( f0 Z$ z
(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).
! n, r0 n- [% s& z3 R7 |" eb) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact* J, B9 S! x$ v
separation equal to the clearance for basic insulation." o V+ l6 t' y( N8 ]. w
: }% t0 M: ^: G! X
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发表于 2012-11-6 16:52
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