Electrical Materials for Container Houses

Electrical materials for container houses mainly include wires, conduit pipes, distribution boxes, and related electrical accessories. The selection of materials should take into account safety, durability, and compliance. The following provides an explanation from the perspectives of electrical material types, material characteristics, supporting materials, and construction points:

I. Core Electrical Material Types

1. Wires
   Copper-core conductors that comply with national standards should be selected, with different cross-sectional areas (such as 2.5mm², 4mm², etc.) chosen according to load requirements. For example, 2.5mm² copper wires are commonly used for lighting circuits, while air conditioners and other high-power appliances require 4mm² or larger specifications. Wires should have flame-retardant properties, with low-smoke zero-halogen (LSZH) types being preferred to reduce fire risks.

2. Conduit Pipes
   PVC flame-retardant pipes or galvanized steel pipes are used to protect wires and prevent mechanical damage. PVC pipes are lightweight and easy to install, suitable for dry environments; galvanized steel pipes have strong corrosion resistance and are suitable for humid or outdoor scenarios. The pipe diameter should be selected according to the number of wires, ensuring that more than 40% of space is reserved for heat dissipation and wire maintenance.

3. Distribution Boxes
   These include components such as circuit breakers and residual current devices (RCDs) and should be of the waterproof and dustproof type (such as IP54 or higher). The rated current of the main switch should match the total load of the house, and branch circuits should have independent circuit breakers to provide overload and short-circuit protection.

II. Material Characteristic Requirements

1. Flame-Retardant Performance
   Electrical materials should pass the national 3C certification, with a flame-retardant rating of B1 or higher. For example, the insulation layer of wires should use cross-linked polyethylene (XLPE) or polyvinyl chloride (PVC) flame-retardant materials, and conduit pipes should comply with the GB/T 20041 standard.

2. Weather Resistance
   Distribution boxes and conduit pipes used outdoors should have anti-ultraviolet and anti-aging capabilities, adapting to a temperature range of -20℃ to 50℃. Galvanized steel pipes should undergo hot-dip galvanizing treatment with a thickness of not less than 65μm to prevent rusting.

3. Electrical Safety
   All metal components should be reliably grounded, with a grounding resistance of ≤4Ω. Equipotential bonding terminals should be set up inside distribution boxes to reduce the risk of electric shock caused by potential differences.

III. Supporting Materials and Construction Points

1. Auxiliary Materials
   These include wire connectors, insulating tape, pipe clamps, expansion bolts, etc. Connectors should use wire caps or welding processes, and the use of black electrical tape for wrapping is prohibited; insulating tape should be of the flame-retardant type with a temperature resistance rating of ≥105℃.

2. Construction Specifications

   • Circuit layout: Strong current (lighting, sockets) and weak current (network, television) should be laid in separate conduits with a spacing of ≥30cm to avoid signal interference.
   • Wiring requirements: The total number of wires in a single conduit should not exceed 3, and the total cross-sectional area should not exceed 40% of the inner diameter of the conduit.
   • Waterproofing: Outdoor wire connections should be sealed with waterproof glue, and distribution boxes should be installed at a height of ≥1.5m with a waterproof base at the bottom.

IV. Compliance Requirements

Electrical materials should comply with the "Code for Design of Low Voltage Electrical Installations" (GB 50054) and the "Standard for Electrical Design of Civil Buildings" (GB 51348). After construction is completed, insulation resistance tests (≥0.5MΩ) and grounding resistance tests should be carried out to ensure safety compliance.