Dimensions of the distribution box with inner door

Distribution boxes with inner doors are available in various sizes, typically constructed from steel with IP-rated protection, customizable inner doors, and mounting provisions for electrical components.

Dimensions

Common wall-mounted metal distribution boxes measure 400x300x200 mm (length x width x depth) for standard applications, with variations depending on the number of modules or ways required.

Larger L

T distribution boxes for substation or industrial use may be fabricated from 2 mm GI sheet steel with reinforced channels and slanted roofs for outdoor installation.

Modular MC

B distribution boxes, such as the L&T 4-way TPN type, accommodate 20 modules and are designed with single or double doors, with dimensions varying according to module count.

Material and Construction

Constructed from 1. 2–2 mm thick steel or CRCA sheet steel, often powder-coated (e.g., RAL 7035 or RAL 9003) for corrosion resistance. Inner doors are fixed inside the box and can be customized; outer doors may include transparent glass for observation.

Mounting plates inside the box are typically 2 mm thick galvanized steel to support electrical components. Protection and StandardsIP ratings range from IP43 to IP65, providing protection against dust and water ingress, suitable for indoor or outdoor installation.

I

K ratings (impact resistance) are IK08 or IK09 for single or double door options.

Outdoor L

T distribution boxes conform to IP55 standards and include solid earthing points on either side.

Features

Locking mechanisms: Quarter-turn closures, Godrej-type 3-position locks, or manual locks with galvanized provisions. Cable entry: Perforations or heavy-duty cable glands for incoming and outgoing cables, often with detachable plates for flexibility. Bus bars and insulation: Copper flat bus bars (e.g., 25x4 mm) with heat-shrinkable tubing or phase-colored insulation for safety.

Doors and hinges: Hinges are concealed from the outside; rubber gaskets ensure watertight sealing.

Customization

Inner doors can be tailored to specific layouts or module arrangements. Outer doors may include transparent panels for monitoring without opening the box. Boxes can be configured for MCB, RCCB, RCBO, or isolator arrangements depending on electrical distribution needs.

These specifications ensure that distribution boxes with inner doors are robust, secure, and adaptable for residential, commercial, or industrial electrical installations.