OSMEE 14-2

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广东安规检测
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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

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3 o/ Q2 F* v* cStandard:
+ H; l2 P4 _7 h; ~EN 60950-1:2005+A1+A11+A12+A2
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4 }: h9 }0 X% v( u/ J9 u0 g7 V/ zQuestion:
1. Should a SELV-supplied equipment generating hazardous voltage inside the enclosure, not accessible to the operator, be classified as Class III?
+ f) N( y9 D: P3 h* `! R: b: j2. What kind of equipment can be unclassified?
3. Can unclassified subassemblies be used in class III equipment?
Proposal for Decision: OSM EE conclusion: decision only in the minutes
' c. G2 l$ n& t8 y1 d! M1. No, Class III shall not contain hazardous voltages irrespective of safety measures or means provided to prevent access.
( ~) y6 U4 e1 R& f7 R* R, g2. Only Class ll equipment needs to be identified as such. Any other equipment needs no classification. Subassemblies need not be classified.
  t: G: {5 C* r) E5 W3. A class III equipment can contain unclassified subassemblies, provided that they do not generate hazardous voltages in the particular application.
6 m4 U  P( i3 S, K6 D1 M  }1 a; SExplanatory notes:
+ P+ d" J' I* X. G2 }, H( ]6 C1. See “Class III equipment” and “Hazardous voltage” definitions below:
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# e9 ?) y" l- k* K1 NCLASS III EQUIPMENT
2 t8 L5 w+ I" R3 U' T6 b! W! s8 _0 mequipment in which protection against electric shock relies upon supply from SELV CIRCUITS
  z! x7 R. n" O" w$ iand in which HAZARDOUS VOLTAGES are not generated
NOTE For CLASS III EQUIPMENT, although there is no requirement for protection against electric shock, all other
requirements of the standard apply.
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HAZARDOUS VOLTAGE
9 i0 p  @3 \% D4 Gvoltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the
, s) w! J1 T: q0 O* xrequirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT
6 Z& z1 D+ b5 _% u1 Y+ |/ c3 J" g2. Some equipment used for telecommunication, example radio base stations, are supplied by batteries or power supplies supplying non hazardous voltages. However they do generate hazardous voltages inside. If the equipment fulfill all requirements in the standard but does not fit in any class it can be unclassified.
Comments from TC108 MT2 meeting in Stuttgart November 2013:
Q1: agree
3 t6 n3 L5 T$ Q2 w. x2 V; K4 X& @Q2: only Class ll equipment needs to be identified as such. Any other equipment needs no classification. Subassemblies need not be classified.
Q3: OK Refer also decision 91/17
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