DSH 447 Disconnect device

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无绳壶无绳电熨斗插拔寿命试验机

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小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 447 9 G7 s0 z0 T( F3 j& o2 o

Disconnect device / X* t3 Z" H& \

3.4.6

60950-1(ed.1)

Standard:
IEC 60950-1:2000, 1st ed
Clause:
. F4 ]! J# d! N8 p) s0 L3.4.6
Sheet No.
447
1 a) ^$ ]* v  @0 C; fSubject:
Disconnect device
Key words:
DC mains supply
Decision taken at the
40th meeting 2003
9 ?$ v! L3 U# s& t3 J1 y$ I! yQuestion:
Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.
The power supply is 40 m far from end use equipment which contains above mentioned unit.
a) Do other test houses require disconnect device for such DC supplied unit?
' ^# w0 y2 {' c  @b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is
+ Z) ^& [6 ?1 g) [; U/ a" ^only 24 Vdc.
Decision:
8 B; d, C. C& u8 ~a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
# z6 i9 }! r( V$ R$ Wmains supply for servicing.
( ~8 r2 T/ I( Z/ h* P( h(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).
b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact
separation equal to the clearance for basic insulation.


2 ]! c) K8 w" O