Electrical Installation for Container Houses

Electrical installation in container houses requires integrating structural characteristics with electrical safety standards, achieving safe electricity usage through rational circuit planning, appropriate equipment selection, and enhanced safety measures.

1. Electrical System Planning and Design

The electrical system in container houses should be customized based on their intended use (e.g., residential, office, or commercial). Key steps include:

1. Load Calculation: Calculate the total electrical load based on the house's area, types of electrical equipment (e.g., air conditioners, lighting, appliances), and quantity to determine cable cross-sectional areas and switch capacities. For example, residential container houses equipped with air conditioners should have dedicated circuits and cables larger than 4mm².
2. Circuit Layout: Use concealed or exposed wiring methods, prioritizing hiding circuits within wall panels or ceilings to avoid exposure. If exposed wiring is necessary, protect it with metal conduits or flame-retardant PVC pipes to prevent mechanical damage.
3. Grounding and Lightning Protection: As container bodies are metallic, they must be reliably grounded (grounding resistance ≤ 4Ω) and equipped with surge protectors (SPDs) to prevent lightning-induced equipment damage.

2. Key Equipment Selection and Installation

1. Distribution Box: Choose a waterproof and dustproof type (IP rating ≥ IP54) with built-in leakage protection switches (operating current ≤ 30mA) and overload protectors to ensure electrical safety.
2. Cables and Sockets: Select cable specifications based on load (e.g., 1.5mm² for lighting, 2.5mm² for sockets). Sockets should have protective doors to prevent electric shock.
3. Lighting System: Prioritize LED fixtures for energy efficiency and low heat generation. If installing pendant lights, reinforce the container roof's load-bearing structure.

3. Safety Protection and Acceptance

1. Insulation Testing: After circuit installation, use a megohmmeter to test insulation resistance (≥ 0.5MΩ) to ensure no leakage risks.
2. Waterproofing: Apply waterproof sealant around cable penetrations and sockets to prevent water ingress and short circuits.
3. Acceptance Criteria: Conduct acceptance inspections in accordance with the "Code for Design of Low Voltage Electrical Installations" (GB 50054), focusing on grounding continuity, leakage protection functionality, and clear circuit labeling.

4. Special Scenario Adaptation

For container houses used in photovoltaic integration (e.g., "power-generating skin" solutions), additional equipment such as photovoltaic inverters, energy storage batteries, and energy management systems (EMS) must be installed to enable intelligent switching between photovoltaic power generation and mains electricity, meeting off-grid operational requirements.