The distribution box should be installed below the wall surface

Yes, a distribution box can be installed below the wall surface (flush-mounted), provided it meets safety, accessibility, and ventilation requirements.Flush-Mounted vs. Surface-Mounted InstallationA flush-mounted distribution box is installed so that its body is recessed into the wall, with only the cover visible. This method is commonly used in residential settings for aesthetic reasons and to save space. In contrast, surface-mounted boxes are attached directly to the wall surface, with the entire enclosure exposed. Both methods are acceptable if proper installation standards are followed .Recommended HeightFor flush-mounted boxes, the bottom edge is typically 1.2 to 1.4 meters above the floor for indoor residential installations, ensuring easy access without bending or stretching . Surface-mounted boxes are usually installed slightly lower, around 1.2 meters, while the standard height for wall-mounted boxes in general is 1.5 to 1.8 meters above the ground for convenient operation and inspection .Safety and Ventilation ConsiderationsDry and accessible location: Avoid humid, wet, or corrosive areas to prevent equipment damage and overheating .Ventilation: Leave sufficient space around the box for air circulation to prevent overheating and allow maintenance .Grounding: Ensure the metal enclosure, electrical board, and appliances are properly grounded, and connect the protective neutral wire reliably .Protection devices: Include circuit breakers, fuses, and leakage protectors for each circuit .Wiring and Installation TipsUse high-temperature resistant copper wires with appropriate cross-sectional area for the load .Keep wiring neat and organized, using cable ties or channels to avoid short circuits .Ensure all cable inlets and cover joints are sealed properly to prevent dust or moisture ingress .For outdoor flush-mounted boxes, ensure the enclosure has a suitable IP or NEMA rating (e.g., IP66 or NEMA 4) to protect against water and dust .ConclusionInstalling a distribution box below the wall surface is acceptable and often preferred for aesthetics and space efficiency. The key is to maintain proper height, ensure safety, provide ventilation, and follow wiring and grounding standards. Both flush-mounted and surface-mounted installations can be safe and compliant if these guidelines are observed .