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Size of a National Standard Level 2 Distribution Box

Fiber and communications infrastructure knowledge brief Published 07 Mar 2023

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Typical Level 2 distribution boxes are fabricated with dimensions that allow for flexibility, generally following illustrative sizes with ±10% tolerance, and are designed to accommodate standard LT busbars, MCCBs, and cable entries.

General Dimensions and Construction

Level 2 distribution boxes are usually outdoor, free-standing enclosures made from 2 mm galvanized steel sheets with reinforced channels for structural stability. The roof is slightly slanted with a 50 mm overhang at the front and back to prevent water ingress. Doors are fitted with Godrej-type 3-position locks and concealed hinges, and the boxes include solid earthing points on either side.

The boxes are designed to meet IP-55 protection standards, ensuring dust and water resistance. The dimensions provided in technical specifications are illustrative, with a tolerance of ±10%, allowing manufacturers to adjust sizes based on project requirements. For example, KVA-rated distribution boxes (63/100/160/315 KVA) have internal arrangements for busbars and incoming/outgoing droppers, with door overlaps and rubber gaskets to ensure proper sealing.

While exact Level 2 dimensions are not universally fixed, typical boxes are sized to accommodate: Busbars: Copper or aluminum flat bars, e.g., 25x4 mm for smaller capacities, larger for higher KVA boxes MCCBs: Provision for 4-pole or 3-pole MCCBs with adequate spacing and insulating barriersCable entries: Heavy-duty double compression cable glands at the bottom for incoming and outgoing cablesPractical ConsiderationsInternal space: Sufficient to house devices, wiring, and future upgrades without overcrowding Mounting: Boxes can be wall-mounted or free-standing, with reinforced channels for stabilityCustomization: Manufacturers may provide custom dimensions to meet site-specific requirements while maintaining compliance with IS/IEC standards SummaryWhile there is no single fixed “National Standard Level 2” dimension, typical Level 2 distribution boxes are designed with flexibility in mind, following illustrative dimensions with ±10% tolerance, reinforced steel construction, IP-55 protection, and provisions for standard busbars, MCCBs, and cable entries.

For precise sizing, it is recommended to consult the technical specification drawings provided by the manufacturer or relevant national standards.

Size of a National Standard Level 2 Distribution Box - ENSAA OPTICAL NETWORKS [PDF]

Size of a National Standard Level 2 Distribution Box

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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