These boxes must be grounded and have safety labels. This keeps people from touching live wires by mistake. Ground metal boxes with a screw. If you've ever found yourself scratching your head over whether that metal door on your distribution cabinet really needs a grounding wire, you're not alone. In factories, construction sites, and even commercial buildings, this question pops up all the time. Your boss might insist on it, while your. Power from factory ground must be installed by a qualified electrician. Preparation: First, you need to prepare some necessary tools, including grounding wire, grounding rod, voltmeter, insulating gloves and. Misconception: If the cable distribution box is not grounded or has poor grounding, it is easy to cause electric shock accidents when the box is electrified.
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