DSH 558/06 Extra safety circuit equivalent to SELV or double/reinforced insulati

小米

广东安规检测
有限公司提供：

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 558/06 ! r  H8 ?: i" q8 S' r* F + R1 @& k: Z/ Y- L

Extra safety circuit equivalent to SELV or double/reinforced insulation 5 \" N/ ^; F# K

12 ! h. n6 B. s6 ?8 Q; W9 v9 L

60570(ed.4)

Question:
A client wants to combine a 230 V track system (according to IEC 60570) with a bus-track system, which tracks are accessible. Consequently the bus-tracks may be supplied by a SELV source only, or connected to circuits, which are insulated from live parts by double or reinforced insulation. Due to the fact that both DALI systems (or similar systems) and control systems of electronic ballasts do not comply with the requirements of double insulation, our client created an additional safety circuit between the bustrack and DALI system/electronic ballast. The extra safety circuit consists of six zener diodes (>50 V) and four fuses (250 mA). The diodes guard the system to voltage higher than 50 V and the fuses protect the system against high currents. In this way SELV conditions are guaranteed.
Decision:
1 B0 K) g! M& b In principle the SELV condition can be reached by electronic means at least according to the standards IEC 60364-4-41 and IEC 61140.
* H, L' \+ S1 v2 l

1 K9 u. g' [1 o& \0 S