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Measurement category I is for measurements performed on circuits not directly connected to' o$ O9 G) O4 L/ }1 }: S8 q, Q
MAINS.# b, {3 T, j6 O8 v& G, i) _1 `- [
Examples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS derived circuits.3 d, e) l' n; J' B
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?0 o( u8 s6 J! O) h) \9 l1 c
Measurement category II is for measurements performed on circuits directly connected to the9 V E+ H) p$ |) A' Z3 F Y
low voltage installation# ?( \$ l" r X( t
Examples are measurements on household appliances, portable tools and similar equipment$ e% g& z; w: i9 W: Z& Z4 Q' N% u ~
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?3 U0 k. L) F9 `! t) h
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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