Square D Meter Centres provide a compact and versatile metering and distribution centre for today's residential, commercial, and industrial markets. All metering stacks have factory installed meter sockets and vertical bus bars, requiring only onsite installation of circuit breakers and main bus links. The 240VAC bonding bar kit is a Square D Meter Centre meter stack accessory. It is required when connecting five or more individual enclosures together. Order one kit for each meter stack and branch tap box.