How to Connect Electricity to Container Houses
When connecting electricity to container houses, it is essential to follow electrical safety regulations and properly plan the power distribution system, wiring, insulation, and lightning protection grounding measures. The specific operations are as follows:
I. Power Distribution System Design
The power distribution system of a container house should integrate mains power input, battery energy storage (optional), and load distribution functions. If equipped with an energy storage system, the core components include battery packs, a battery management system (BMS), an energy storage inverter, and an AC distribution box. The mains power is connected to the AC side of the energy storage converter through a three-wire power supply and then distributed by the distribution box to load circuits such as air conditioners, lighting, and fans. It is necessary to ensure balanced three-phase loads to avoid power supply abnormalities. The distribution box should reserve an access control signal wire interface, with the terminal connected to the client's control cabinet.
II. Wiring and Cable Selection
The power supply system should use outdoor cross-linked polyethylene insulated flame-retardant cables, distinguishing live wires, neutral wires, and ground wires with different colors. These cables should have independent insulation and sheath layers, with a long-term operating temperature of no less than 105°C and an insulation withstand voltage value one level higher than the actual voltage. Wiring should be fixed along the container frame or dedicated wire troughs, avoiding contact with sharp edges. Strong current and weak current lines should maintain a spacing of more than 30 cm to reduce interference.
III. Insulation and Protective Measures
The gaps between channels and equipment cabinets should be covered with flame-retardant insulating mats with an insulation voltage of ≥5 kV, extending to the entire channel area with neatly trimmed edges. All metal casings of electrical equipment, distribution boxes, and metal pipes should be reliably grounded, with a grounding resistance of ≤4 Ω. Grounding wires should be marked with yellow and green colors, and connection points should have paint and rust removed to ensure good contact.
IV. Lightning Protection and Grounding System
Lightning protection devices should be installed on the roof of the container house and connected to at least two grounding bars through grounding flat steel or round steel. The lightning protection design should comply with the "Code for Design of Lightning Protection of Buildings" (GB 50057). If the area is not covered by the original lightning protection system, a separate lightning protection system should be configured. The grounding post should be welded to the container body at the same potential, and non-functional conductive conductors (such as metal casings) should be connected to the grounding copper bar to form a reliable equipotential network.
V. Lighting and Emergency Systems
Indoor lighting should use LED three-proof lights (dustproof, waterproof, explosion-proof) with a protection rating of IP65 and WF2 or above; outdoor lighting should use explosion-proof lights. An emergency lighting system should be installed, automatically switching in case of a power outage, with an effective lighting time of ≥90 minutes and a luminous flux of ≥50 lm, complying with the requirements of the "Code for Design of Fire Emergency Lighting and Evacuation Indicating Systems" (GB 17945—2010). Lighting control switches should be placed near the door for easy operation during emergency evacuations.
