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|  PDSH 992/ X- L( Z2 ]( Y/ c7 v/ M8 }
: h+ P/ S7 o8 a- z" m8 `, ^ | Extra safety circuit equivalent to SELV or double/reinforced insulation/ R+ t W8 j: P4 i
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y% f5 W B t* u* M8 b | 60570(ed.3);am1;am2 & 60570(ed.4)4 e, w3 ?( v: g3 k4 R/ G q8 W' R
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Standard(s):7 W# Z( }7 g1 A4 A9 d1 l1 d6 Z7 B
IEC 60570 All editions( D7 [4 {9 s! M, r
Subclause(s): 12
* S' V- H" P8 DNo. Year PDSH 0992 20108 ^) f9 F( @" v) ]
Category: LITE Developed by: ETF5 OSM/LUM+ Z; G; q% o6 @* |5 \: |5 t m
Subject:, E# r, y0 W9 N9 e% ~3 [+ \; B
Extra safety circuit equivalent to SELV or double/reinforced insulation
# Q; `' Y1 h2 oKey words:; A: B1 W( D4 c+ m! w; S
- SELV condition
0 t0 y3 B% a6 b5 F$ |- Electronic means+ w2 N; e3 m8 D) Q
- IEC 60364-4-41 / IEC 61140
8 Y. H4 t0 Z* m# h6 x# D! @. o" s9 F5 oTo be approved at the 49th CTL Plenary Meeting, in 20122 x3 g+ Q" L8 D/ ~+ [4 X: I
Question:3 C+ c1 K$ m: ^% e K
A client wants to combine a 230 V track system (according to IEC 60570) with a bus track system, which$ q5 m# m3 k% k
tracks are accessible. Consequently the bus-tracks may be supplied by a SELV source only, or connected to/ W/ s# a& a: D! o8 D/ c `% d) K8 ~) u- Z
circuits, which are insulated from live parts by double or reinforced insulation. Due to the fact that both
2 \; a* K$ r8 L) {3 b8 u( |DALI systems (or similar systems) and control systems of electronic ballasts do not comply with the W# x% ?9 J8 ~' U+ ]- N# o* {9 o
requirements of double insulation, our client created an additional safety circuit between the bus-track and7 ?) N% |1 z0 H5 j2 x& r
DALI system/electronic ballast. The extra safety circuit consists of six zener diodes (>50 V) and four) w4 |4 Q' q& f) L
fuses (250 mA). The diodes guard the system to voltage higher than 50 V and the fuses protect the system
4 R! L- s& i9 ~$ L2 p- P, L" [against high currents. In this way SELV conditions are guaranteed./ k b& D) p) r
Decision:5 q/ g1 K. P) b+ g
In principle the SELV condition can be reached by electronic means at least according to the standards! T) K$ M7 H" w& N4 S7 Q
IEC 60364-4-41 and IEC 61140.
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发表于 2012-9-15 15:23
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