Why selective coordination?

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Why selective coordination?

机译：为什么要进行选择性协调？

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The NEC defines selective coordination as "Localization of an overcurrent condition to restrict outages to the circuit or equipment affected...." What this means to the user of a facility is that the failure of a small space heater or fractional horsepower motor will not open the feeder or main overcurrent protective device for the entire building. This may cause all work to stop and the building to be evacuated until the problem is located and removed and the main overcurrent protective device reset or replaced. In a building that has selective coordination, only the branch circuit over-current protective device opens for a fault on the branch circuit. Neither the feeder nor main overcurrent protective device will open.

机译：NEC将选择性协调定义为“过电流情况的局部化，以限制对受影响的电路或设备的中断...。”这对设施的用户而言意味着小空间加热器或小功率电动机的故障不会打开整个建筑物的馈线或主过流保护装置。这可能会导致所有工作停止，建筑物被疏散，直到找到并消除问题，并重置或更换了主要的过电流保护装置。在具有选择性协调的建筑物中，只有分支电路过电流保护装置会因分支电路上的故障而断开。馈线和主过流保护装置均不会打开。

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《Consulting-specifying engineer》 |2012年第1期|p.41|共1页
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Why selective coordination?

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