Circular Specifications of Distribution Box Fixing Plate

Distribution box fixing plates are typically detachable, made of corrosion-resistant metal, and designed to accommodate cable glands and MCCBs with standard mounting provisions.Material and ConstructionFixing plates in LT distribution boxes are generally fabricated from galvanized or brass metal to prevent rusting and ensure durability in outdoor conditions . The plates are designed to be detachable, allowing easy installation or replacement of cable glands and other components without dismantling the entire box . The thickness of the plate is usually sufficient to support the weight of incoming and outgoing cables and MCCBs, often conforming to the overall box fabrication standards (e.g., 2 mm GI sheet for the box body), .Mounting and DimensionsCircular or pre-punched holes are provided on the fixing plate to accommodate cable glands and fasteners. These holes are sized according to the cable diameter and gland type, typically heavy-duty double compression type for secure cable entry .The fixing plate is mounted inside the distribution box with suitable channels or brackets, ensuring proper clearance from busbars and other live components to comply with IE rules and IP-55 protection standards .Tolerances for dimensions are generally ±10%, allowing flexibility in manufacturing while maintaining compatibility with standard MCCB and busbar arrangements .Installation ConsiderationsThe plate should allow adequate spacing for incoming and outgoing cables, ensuring no interference with busbars or other electrical components .Earthing points are often provided on either side of the plate to maintain proper grounding of the distribution box .The fixing plate must support phase-colored insulated tubing or painted busbars (Red, Yellow, Blue, Black) for clear identification of phases .For boxes with multiple MCCBs, metallic or heat-resistant insulating barriers may be integrated on the plate to prevent heat transfer and ensure safety during fault conditions .Compliance and TestingFixing plates, along with the distribution box, should comply with IS 13947 standards and be tested for mechanical strength, corrosion resistance, and electrical safety at approved laboratories such as CPRI . Proper documentation, including type test certificates, is required to ensure adherence to safety and quality standards. In summary, circular fixing plates in distribution boxes are robust, detachable, corrosion-resistant, and designed with pre-punched holes to accommodate cable glands and MCCBs while maintaining safety clearances and compliance with IP-55 and IS standards .