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Bhutanese Standard Requirements for Distribution Box Sizes

Distribution boxes in Bhutan are generally required to meet specifications for material, protection, and configuration, including IP-55 protection, reinforced GI sheet construction, and proper bus bar and earthing arrangements.Material and Construction
  • Distribution boxes should be fabricated from 2 mm galvanized iron (GI) sheet steel for durability and outdoor suitability .
  • The body must have sufficient reinforcement with channels to support the structure and allow secure fixing of components .
  • The roof should be slightly slanting with a 50 mm overhang at the front and back to prevent water ingress .
Protection and Security
  • Boxes must conform to IP-55 degree of protection, ensuring resistance to dust and water jets .
  • Locking arrangements should use a Godrej-type 3-position locking system, with additional galvanized manual locks to prevent rusting .
  • Door hinges should be concealed from the outside for security and aesthetic purposes .
Electrical Configuration
  • Bus bars must be arranged to provide adequate clearance from the box body, following applicable I.E. rules for low-tension supply .
  • Provision for one bus bar arrangement with a 4-pole MCCB for all LTDB capacities is required, along with one outgoing feeder arrangement with 2 sets of 3-pole MCCBs .
  • Earthing points: Two solid earthing points should be provided on either side of the box .
Additional Considerations
  • Preference is given to boxes with insulators fixed on suitable arrangements for safety and reliability .
  • Type test certificates for IP-55 compliance from CPRI or government-approved laboratories are required for procurement .
Accessing Official Standards

For the most authoritative and up-to-date specifications, the Bhutan Standards Bureau (BSB) provides national standards and technical guidelines, which can be purchased or accessed digitally via the eStandards platform . The Ministry of Energy and Natural Resources also issues regulations and grid codes that may include additional requirements for distribution boxes . These specifications ensure that distribution boxes in Bhutan are safe, durable, and compliant with national electrical standards, suitable for both residential and industrial low-tension applications.

Bhutanese Standard Requirements for Distribution Box Sizes

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standardization Services Standardization Division was established as per the Bhutan Standards Act 2010 to develop

Downloads – Bhutan Standards Bureau-BSB

National Standards Conclave Documents NSC proceedings note Stakeholder standards prioritization sheet National standards

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Technical note

This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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