一, Core principles of power location planning
1. Safety priority principle
Electrical isolation: The power driver must be installed in a dry and ventilated independent space, at least 0.5 meters away from the lamp body, to avoid safety hazards caused by high temperature accumulation.
Overload protection: The load power of a single circuit should not exceed 80% of the rated power of the driver. For example, when using a 100W driver, the actual connected power of the lighting fixture should be ≤ 80W.
Grounding specification: The metal casing driver must be reliably grounded with a grounding resistance of ≤ 0.5 Ω, and connected using a yellow green dual color wire (cross-sectional area ≥ 1.5mm ²).
2. Principle of maximizing efficiency
Voltage drop control: Single circuit line length ≤ 50 meters (220V power supply). If low-voltage LED (such as 12V/24V) is used, the wire diameter should be selected according to the current density:
12V system: Voltage drop per meter ≤ 0.3V (recommended to use 2 × 1.5mm ² copper wire)
24V system: Voltage drop per meter ≤ 0.6V (recommended to use 2 × 1.0mm ² copper wire)
Driver layout: Adopting a combination of "centralized+decentralized" approach, a central driver cabinet is set up in large spaces (such as living rooms), and micro drivers are used in small spaces (such as wardrobes).
3. Principle of aesthetic coordination
Concealed installation: The power driver should be concealed in concealed positions such as ceilings, cabinets, and baseboards, and the exposed parts should be covered with decorative panels (such as matte white ABS material).
Beautification of cable trays: PVC cable trays in the same color as the wall should be used for exposed wiring, and 45 ° splicing technology should be used at corners with a gap width of ≤ 1mm.
二, Power supply location planning schemes for different spaces
1. Power supply planning for linear lights in the living room
Typical scenarios: TV background wall, ceiling reflective groove, curtain box lighting
Key planning points:
The television background wall:
The power driver is hidden inside the back panel of the TV cabinet, at a height of 300mm from the ground
Low voltage power supply (24V) is adopted, and the line is laid along the embedded Φ 20PVC pipe inside the wall
Reserved maintenance port (size ≥ 300 × 300mm) for easy maintenance in the later stage
Ceiling reflective groove:
The driver is installed near the air conditioning maintenance port, utilizing the existing space
Using a magnetic track system, the power cord is routed through the interior of the track
Set up a power tap every 8 meters to reduce voltage drop
Case reference: A 120 square meter residential project in Shanghai adopted a "central drive cabinet+partitioned power supply" scheme in the living room, where three drivers were centrally installed in the ceiling of the aisle. The galvanized steel pipe was used to protect the circuit and achieve unified control of linear lights throughout the house.
2. Kitchen linear light power planning
Typical scenarios: cabinet bottom edge, middle island platform, and hanging cabinet bottom
Key planning points:
Lighting along the lower edge of the cabinet:
The driver is hidden inside the cabinet, at a height of 150mm from the ground
Use a waterproof IP65 driver to prevent steam erosion
The circuit is concealed along the back panel of the cabinet, with a groove depth of ≥ 10mm
Zhongdao Tai Lighting:
Power supply is connected from the basement or adjacent cabinets to reduce ground slotting
Adopting a dimmable driver (supporting 0-10V dimming) to match different cooking scene requirements
Reserve backup power interface for future equipment addition
Technical parameters: The working temperature of the kitchen area driver should be ≤ 60 ℃. It is recommended to choose an intelligent driver with temperature control protection (such as the Mean Well HLG series).
3. Power supply planning for bedroom linear lights
Typical scenarios: Bedhead background wall, wardrobe interior, bay window lighting
Key planning points:
Bedside background wall:
The driver is installed behind the bedside table, at a height of 500mm from the ground
Use a dual control switch to control the main light and linear light separately
The line adopts the "live line technology", which is convenient for later renovation
Interior lighting of wardrobe:
The power supply is led down from the ceiling, and a Φ 16 hose is used to protect the circuit
The driver is installed on the top of the wardrobe and used in conjunction with the human body sensing switch
Maintain a distance of ≥ 300mm between the lighting fixtures and clothing to prevent overheating
Innovative solution: A high-end housing project in Shenzhen adopts a combination of "wireless charging+low-voltage power supply" in the bedroom, integrating the driver with the wireless charging module to achieve an integrated design of lighting and equipment charging.
三, Construction specifications and acceptance standards for power supply locations
1. Line laying specifications
Separation of strong and weak electricity: The distance between the LED power cord and the network cable or TV cable should be ≥ 300mm, and aluminum foil should be wrapped around the intersection to prevent interference
Bending process:
Bending radius ≥ 6 times the diameter of the pipe (PVC pipe)
Use a spring-loaded pipe bender to avoid wrinkling of the pipe wall
Fixed spacing: The conduit is fixed with pipe clamps every 800mm, and the trunking is fixed every 500mm
2. Driver installation requirements
Technical requirements for installation environment and protective measures
Waterproof rating ≥ IP67 in damp areas, and installation of waterproof box
Add a cooling fan when the working temperature in high-temperature areas is ≤ 70 ℃
Use anti loosening screws in vibration areas with seismic resistance level ≥ 8
3. Acceptance checklist
Electrical safety testing:
Use a megohmmeter to detect insulation resistance ≥ 2M Ω
Grounding resistance tester detects ≤ 0.5 Ω
Leakage protector action current ≤ 30mA
Functional testing
Dimming function: 0-100% smooth dimming without flicker
Color temperature switching: supports 2700K-6500K adjustment (if equipped with adjustable color temperature driver)
Emergency function: Drivers with backup batteries must meet 90 minute continuous lighting requirements
Appearance inspection:
The driver is securely installed without any shaking
The seams of the trunking are tight and free of burrs
The inspection port opens flexibly and the lock buckle is effective
四, Common problem solutions
1. Insufficient voltage leads to brightness attenuation
Phenomenon: The brightness at the end of the linear lamp is significantly lower than that at the starting end
Solution:
Shorten the power supply distance (≤ 30 meters)
Switch to high-voltage LED strip (220V direct power supply)
Add power tap points (set a driver every 10 meters)
2. Drive noise interference
Phenomenon: You can hear a buzzing sound from the driver at night
Solution:
Choose a flicker free driver (THD<10%)
Move the driver away from the bedroom
Install rubber shock absorbers under the driver
3. Intelligent control failure
Phenomenon: Unable to adjust the lighting through the app
Solution:
Check Wi Fi signal strength (≥ -70dBm)
Confirm that the driver supports the protocol (such as Tuya/Zigbee 3.0)
Update firmware to the latest version
