18.17 If two or more units are interconnected electrically and one of them is grounded, they shall be bonded together, such as by means of a conductor included in an interconnecting cable or by a conductive mechanical means, including the use of starwashers or the equivalent (see 19.7 – 19.11).
如果你的兩個以上的unit 是連接在一起使用的,而一個unit視有接地,那其他unit也需要接地,並且,是與提供PE的那個unit bonding在一起.
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