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1.2.4.3% T/ N8 P2 b4 |6 H1 y' b# D! `( h T
CLASS III EQUIPMENT
1 Y( {- n9 q1 M- {( T" W. ?% U! w. Z5 cequipment in which protection against electric shock relies upon supply from SELV CIRCUITS: H$ s7 x3 e- L; R2 a L5 S3 Q. Y
and in which HAZARDOUS VOLTAGES are not generated/ ?7 [- j* E, q: K5 B
1.2.8.6
0 ?! y( M- q& ^) L xHAZARDOUS VOLTAGE+ _. ~5 X9 [6 @! k) B) l
voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the5 J8 {9 Z* _4 c3 @+ R. g
requirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT
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$ g! k) y7 D& c我个人也是觉得定义为三类设备有点勉强,电话机里面没有产生HAZARDOUS VOLTAGE这个可以说得过去,但是电话机连接到TNV电路,而TNV电路又不一定是SELV电路;既然不一定是SELV电路,那就很难满足三类设备的定义。 |
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