Wiring for Container-Refit Houses
The core steps for wiring in container-refit houses include route planning, trenching and piping, wire threading and installation, and safety testing, all of which require professional operation based on the structural characteristics of the container and power demands.
I. Route Planning and Layout Design
The positions of electrical appliances should be determined according to the functional zones of the container house (such as bedrooms, kitchens, and bathrooms), including lighting fixtures, sockets, air conditioners, etc. When planning the routes, the principle of "short distance and few intersections" should be followed to avoid voltage loss caused by long routes. For example, the kitchen should be equipped with wires of over 4 square millimeters separately to handle high-power appliances, while ordinary sockets can use wires of 2.5 square millimeters. Spare routes should also be reserved for the addition of equipment in the future.
II. Trenching and Piping
The walls of containers are mostly made of metal, so an angle grinder should be used to cut and trench. The depth should cover the thickness of the PVC conduit (usually 1.5-2 centimeters). After trenching, the cut should be painted with anti-rust paint to prevent metal oxidation. When laying the conduits, the bending radius of the conduits should be kept more than six times the diameter to avoid damage to the wires during threading. High-voltage wires (for lighting and sockets) and low-voltage wires (for networks and televisions) should be laid separately, with a spacing of more than 30 centimeters to reduce interference.
III. Wire Threading and Equipment Installation
Before threading the wires through the conduits, the integrity of the insulation layer should be checked, and damaged wires should be replaced. When threading the wires, steel wires can be used for traction to avoid direct pulling that may cause the insulation layer to fall off. The wire terminals should be crimped firmly, wrapped with insulating tape, and then protected with heat-shrinkable tubing for secondary protection. The distribution box should be installed in a dry and ventilated place, and the circuit breakers should match the specifications according to the line load (for example, a 16A circuit breaker corresponds to a 3.5-kilowatt device).
IV. Safety Testing and Acceptance
After the installation is completed, three tests should be carried out:
- Insulation Resistance Test: Use a megohmmeter to test the insulation value of the lines, which should be greater than 0.5 megohms;
- Grounding Test: Ensure that the metal box is reliably connected to the grounding electrode, and the grounding resistance is less than 4 ohms;
- Power-on Test: Turn on the devices one by one and check whether the socket voltage is stable (220V ± 10%).
Precautions: Since the metal structure of containers is highly conductive, insulating sleeves should be installed on all wires passing through the walls to avoid the risk of short circuits.
