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Measurement category I is for measurements performed on circuits not directly connected to
+ ~% Y) Q$ f0 x9 |. y- ZMAINS.
0 `: D7 s+ F2 k+ [5 R# `) _- CExamples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS derived circuits.
4 q: o2 X8 a! \0 T4 n$ v {测量类别一说不直接与电网相连的电路,像次级电路也算吗?
2 v! d, ^: g0 p/ o* L$ I4 iMeasurement category II is for measurements performed on circuits directly connected to the. @( e, v! F0 E7 I" m; `0 S
low voltage installation
) O, W8 y2 Z0 _8 AExamples are measurements on household appliances, portable tools and similar equipment$ Z3 j! v, I4 M
测量类别二说是直接与低压设施相连的电路,但例子又说家用电器,一般的家用电器都是和电网相连的啊,那220V算是低压吗?* r3 B7 z/ n3 J* ]* B9 h2 g
到底像通用的用插头连接电网供电的设备应该算测试类别几啊?感觉测试类别一和测试类别二区分的不太明显,他们的电气间隙在标准中也是一样大的,请知道的人给个准确直接点的回答啊 |
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