Household distribution boxes can be installed on the ground or on the wall. 4m away from the ground; when surface installed in the wall, the bottom is. Power from factory ground must be installed by a qualified electrician. Each DISTRIBUTION BOX and controller must be grounded. 26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. Whether in a home or an industrial facility, this box keeps your electrical setup organized, functional, and efficient. Preparation: First, you need to prepare some necessary tools, including grounding wire, grounding rod, voltmeter, insulating gloves and insulating tools. Make sure all tools are intact to prevent accidents during the grounding. What is a Distribution Box? A distribution box, or DB box, is a circuit breaker enclosure.