Specifications and dimensions of communication tower power distribution boxes
Communication tower power distribution boxes are typically fabricated from 2 mm GI sheet steel, with IP-33 to IP-55 protection, reinforced doors, and busbar arrangements sized according to KVA ratings.
Construction and Material
Distribution boxes for communication towers are generally outdoor-rated and fabricated from 2 mm galvanized iron (GI) sheet steel for durability and corrosion resistance. The roof is slightly slanted with a 50 mm overhang to prevent water ingress, and doors are reinforced with suitable channels for structural integrity. Locking mechanisms often use Godrej-type 3-position locks or equivalent, with hinges concealed from the outside for security ( ).
Protection and Safety
- Ingress Protection (IP): Boxes are designed with IP-33 to IP-55 ratings depending on the model, ensuring protection against dust and water penetration ( ).
- Earthing: Two solid earthing points are provided on either side of the box.
- Arc Protection: For higher KVA boxes (160/315 KVA), porcelain cutouts and arc chutes are used to extinguish arcs and protect outgoing circuits ( ).
- Insulation: Busbars and droppers are covered with PVC insulating sleeves with standard color coding for phases ( ).
Busbar and Electrical Specifications
- Busbar Sizes:
- 63/100 KVA: 72 x 50 x 8 mm
- 160/315 KVA: 120 x 50 x 15 mm
- Feeder Droppers:
- 63/100 KVA: 50 x 8 mm
- 160/315 KVA: 50 x 15 mm
- Incomer Droppers: Same as feeder droppers for respective KVA ratings ( ).
- Phase Sequence: RYB maintained throughout the box.
- Cable Entry: Standard cable lengths range from 1 m to 10 m, with provisions for service loops not exceeding 10 feet ( ).
Dimensions and Layout
- Door and Base Overlap: 10 mm overlap with rubber gaskets for sealing.
- Hinges: Minimum 50 mm in length, made from 2 mm thick stainless steel, four per side.
- Internal Layout: Busbars and MCCBs are arranged to provide adequate clearance from the box body, with optional lighting inside the cabinet ( ).
- Mounting: Boxes can be wall-mounted or tower-mounted, with adjustable studs and nuts for secure installation ( ).
Additional Features
- Heat Dissipation: Louvers or perforated sheets are provided for ventilation.
- Access and Maintenance: Doors are designed for easy opening with removable handles, and internal components are accessible for maintenance without obstruction.
- Identification: Non-detachable nameplates and punch marks for purchaser identification.
- Compliance: Type-tested at CPRI or NABL-accredited laboratories for impulse and short-circuit withstand ( ). These specifications ensure that communication tower power distribution boxes are robust, weather-resistant, and safe, while providing flexibility for different KVA ratings and installation requirements.
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