如何选择合适rating 的 mccb 同 铜线?

Answer 1

更新1:

可能举例说明吗? 例如当我有一个马达
running current 是 60A
要怎样计算和选择呢?

1. 考虑电器起动电流，运行电流。 2. 考虑电源短路电流。 用星角起动，起动电流大约系运行电流既三陪，选择MCB或MCCB时参考mcb tripping curves & mccb tripping curves protekuk.co.uk/portal/default?id=988&idcategoria=1082&idsottocategoria=1089&lang=ita&sez=technicalinfo mcb有type B
C
D 短路电流要计算电源输入端 protekuk.co.uk/portal/default?id=988&idcategoria=1082&idsottocategoria=1083&lang=ita&sez=technicalinfo 铜电线参考Table 4D1A & 4D1B 计算满载电流及电压降 batt.co.uk/upload/files/table4d1abs6004bs6231bs6346_1220253954.pdf 例如 如果MCCB输入端离开火牛100公尺左右，电线用25mm ~ 35mm，MCCB可以用25KA，如果MCCB输入端离开火牛10公尺左右，电线用16mm ~ 25mm ，MCCB可以用50KA。 如果一个马达满载60A，起动就会至少180A，除非你用变频器或软起动，要用MCCB至少75A ~ 100A 如有唔明 [email protected]
you have to calculate the max
short circuit current and the earth fault loop impedance to used up the right size
diameter and right current limitation of the RCCB and the wires. 2010-01-19 23:22:39 补充： add bulk to the diameter of the wires is not work
it can't lower the earth fault loop impedance. 2010-01-25 16:45:54 补充： if your MCCB just for one appliance
you only calculate the earth fault loop impedance
max.short circuit current of the appliance
but if its a home circuit
you should not modified until you were licensed.