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

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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

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家电温升测试角

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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

! m2 i$ B5 t# m* l+ B$ e1 p- LStandard:
EN 60950-1:2005+A1+A11+A12+A2
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Question:
5 z: {" p! a; r* k+ y1. Should a SELV-supplied equipment generating hazardous voltage inside the enclosure, not accessible to the operator, be classified as Class III?
2. What kind of equipment can be unclassified?
# B0 U$ m- T* I1 v' U3 k, z3 ~) T3. Can unclassified subassemblies be used in class III equipment?
7 r9 s" x! k. r/ J* F. jProposal for Decision: OSM EE conclusion: decision only in the minutes
4 r* E, }; B0 L* m& X9 u1. No, Class III shall not contain hazardous voltages irrespective of safety measures or means provided to prevent access.
* [8 |4 R' t  V* y- P7 k3 i4 S. S4 u- _2. Only Class ll equipment needs to be identified as such. Any other equipment needs no classification. Subassemblies need not be classified.
# p: y; W1 }$ Y+ c2 f0 ~3. A class III equipment can contain unclassified subassemblies, provided that they do not generate hazardous voltages in the particular application.
Explanatory notes:
" F% E; x! p5 w* Z& E" \# b. v8 e1. See “Class III equipment” and “Hazardous voltage” definitions below:
1.2.4.3
7 J; r" d4 q0 ?7 q0 n- b' }+ NCLASS III EQUIPMENT
3 }( ]- K2 k9 s$ l) j" }7 Jequipment in which protection against electric shock relies upon supply from SELV CIRCUITS
# d& \' E. d2 ~' I0 X! I1 ~' B) ]+ ^and in which HAZARDOUS VOLTAGES are not generated
+ [0 J2 s4 o- {& K0 q' S& mNOTE For CLASS III EQUIPMENT, although there is no requirement for protection against electric shock, all other
: w- e5 P+ q/ crequirements of the standard apply.
1.2.8.6
7 o% w  x* X5 O+ q- m3 R, bHAZARDOUS VOLTAGE
voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the
0 d+ u$ t' Y% K. x% _4 j1 hrequirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT
0 F+ {3 {* V6 R: V  J* o+ y2. 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.
6 I* P) y- M5 B/ p: XComments from TC108 MT2 meeting in Stuttgart November 2013:
Q1: agree
Q2: only Class ll equipment needs to be identified as such. Any other equipment needs no classification. Subassemblies need not be classified.
5 L) c: K6 z& |4 M# }# H5 ^Q3: OK Refer also decision 91/17


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