An equipotential bonding box is an electrical safety device used for equipotential bonding. It can be connected to the building electrical system via surface mounting or concealed mounting. Its core functions include integrating chassis grounding, lightning protection grounding, static electricity grounding, AC/DC working grounding, and grounding channels for metal components. It uses a crimp interface and four screw terminals to achieve equipotential bonding of multiple devices.
Internally, the device employs varistor or discharge tube elements, utilizing the principle of nonlinear resistance to suppress noise interference. The box has multiple knockout holes, supporting multi-directional connection of flat steel and wires. It connects bathroom metal components (faucets, metal pipes, bathtub supports, etc.) and the power PE line to the main grounding terminal via dedicated yellow-green wires.
According to standards, at least two independent flat steel connection points to the grounding grid must be installed, and the wire cross-sectional area must meet the fault current carrying requirements. When used in areas such as kitchens and bathrooms, BVR 4 square millimeter wires must be concealed in conduits, and the connection status must be checked regularly.
