Each cabinet must be equipped with an earthing bar or a ground reference metal sheet. All shielded cables and external protection circuits must be connected to this point. Plastic. Part VIII of Article 250 deals with grounding and bonding direct-current (DC) systems supplying power to premises. Although most electrical energy produced commercially is generated, transmitted, and. The most effective data center cabinet grounding methods you'll encounter today include the Master Ground Bus Bar (MGB) system, Direct Cabinet-to-Grid Connection, Isolated Ground Path Implementation, Mesh Ground Network Design, and Signal Reference Grid Integration.