Sectional Code for Electrical Design of Civil Buildings:
10.1 General provisions
10.1.1 When designing lighting, according to the visual requirements, the nature of the work and the environmental conditions, through the selection and configuration of the light source and the luminaire, the working area or space has reasonable illumination and color rendering, suitable brightness distribution and comfort. Visual environment.
10.1.2 When determining the lighting scheme, special requirements for lighting of different types of buildings should be considered, and the relationship between electrical lighting and natural lighting should be handled; the relationship between high-efficiency light source, lighting and pursuit of lighting effect should be considered; rational use of construction funds and high adoption The relationship between technical and economic benefits such as performance standard light source lamps.
10.1.3 Electrical lighting design should consider the following elements:
1 Conducive to the safety, comfort and correct identification of the human environment, to avoid the loss of coordination between people and the light environment.
2 Pay attention to the clarity of the field of view, eliminate unnecessary shadows, and control the adverse effects of light and ultraviolet radiation on people and things.
3 Create appropriate brightness distribution and illumination levels to limit the effects of glare on people's discomfort.
4 Deal with the relationship between color temperature and color rendering of the light source; the color difference between the general color rendering index and the special color rendering index to avoid visual psychological disharmony.
5 Effective use of natural light, reasonable choice of lighting methods and control of lighting areas, reducing power consumption.
10.1.4 In the case of electrical lighting design, in addition to complying with this specification, it should also comply with the current national standard "Building Lighting Design Standards" GBXXXX and other relevant specifications.
10.2 Lighting quality
10.2.1 The uniformity of illumination of general illumination in the general workplace (the ratio of the minimum illumination to the average illumination on the reference plane) shall not be less than 0.7.
10.2.2 When the local illumination is shared with general illumination, the illumination value of the general illumination on the work surface should be 1/3 to 1/5 of the total illumination value of the work surface. And should not be lower than 50lx. The illumination of the traffic area should not be lower than the illumination of the work area by 1/5.
10.2.3 The color quality of an illumination source depends on the apparent color of the source itself and its color rendering properties. General lighting sources are classified into three categories according to their correlated color temperatures, and their applicable locations can be selected according to Table 10.2.3:
10.2.4 Lighting design should meet the requirements of the national standard "Architectural Lighting Design Standards" GB***** for the color rendering of different workplace light sources, and coordinate the relationship between color rendering requirements and design illuminance.
10.2.5 The color characteristics of the illumination source and the color matching of the interior surface should be coordinated to form a color environment corresponding to the function of the room.
10.2.6 When designing general lighting, the quality level UGR for direct glare limitation should be reasonably determined according to the characteristics of the visual working environment and the degree of glare. The quality level of glare limitation is shown in Table 10.2.6.
10.2.7 Indoor general lighting The limitation of direct glare should be considered comprehensively from factors such as the brightness of the light source, the apparent area of â€‹â€‹the light source and the luminaire, the background brightness and the position of the luminaire.
10.2.8 In lighting locations where the uniform glare value UGR â‰¤ 22, the light curtain reflection and reflected glare should be effectively limited for damage contrast reduction visibility. The following measures can usually be taken:
1 Avoid installing the luminaire in the interference zone or in areas that may be specularly reflected in the visually working eye.
2 Use lamps with large luminous surface area, low brightness and good light diffusion performance.
3 Low-gloss surface finishes are used in work objects and work rooms.
4 Use special light distribution (small reflected light) fixtures in the direction of the line of sight, or use indirect lighting.
1) Use local illumination.
2) Illuminate the ceiling and wall to reduce the brightness ratio, but avoid spots.
10.2.9 Direct luminaires shall control the relationship between the brightness of the illuminators in the line of sight and the shading angle; the minimum allowable values â€‹â€‹are given in Table 10.2.9:
10.2.10 Long-term visual workplace brightness and illuminance distribution should be selected according to the following ratio:
1 The brightness ratio of the work area brightness to the adjacent environment of the work area should not be lower than 3:1; the ratio of the brightness of the work area to the average brightness around the field of view (such as ceiling, wall, window, etc.) should not be lower than 10:1; the brightness of the lamp and The ratio of work area brightness should not be greater than 40:1.
2 When the lighting fixture is concealed, the reflection coefficient of the ceiling should be greater than 60%, and the illumination of the ceiling should not be less than 1/10 of the illumination of the working area.
10.2.11 In order to make the shape of the illuminated object have a stereoscopic effect, the ratio of the vertical illumination (Ev) to the horizontal illumination (Eh) can be maintained under the following conditions:
0.25 â‰¤ Ev / Eh â‰¤ 0.5 (10.2.11)
10.2.12 In order to meet the requirements of visual adaptability, the horizontal illuminance of the area within 0.5m around the visual work area shall be in accordance with the provisions of the Architectural Lighting Design Standard GB*****.
10.3 Lighting methods and types
10.3.1 Lighting methods can be divided into: general lighting, district general lighting, local lighting and hybrid lighting.
1 When it is only necessary to increase the illumination of certain working areas in the room, it is advisable to use partitioned general lighting.
2 Partial lighting should be used in the following situations:
1) Partially required higher illumination;
2) certain ranges that are not illuminated by general illumination due to occlusion;
3) People with reduced visual function need to have higher illumination;
4) need to reduce the reflection glare in the work area;
5) When enhancing the illumination in a certain direction to enhance the texture.
3 Mixed lighting can be used when general lighting or partitioned general lighting does not meet the requirements.
10.3.2 The types of lighting can be divided into: normal lighting, emergency lighting, duty lighting, security lighting, landscape lighting and obstacle lighting. Emergency lighting includes standby lighting (lighting for continued and temporary work), evacuation lighting, and safety lighting. The duty lighting should utilize some or all of the individual lighting that can be controlled individually.
10.3.3 The alternate lighting should be installed on the wall or ceiling. Evacuation lighting should be installed at the top of the evacuation exit or on the wall of the evacuation walkway and its corner at a distance of less than 1 m from the ground. The distance between the evacuation indicator lights on the walkway should not exceed 20m. The requirements for the setting of emergency lighting shall comply with the relevant provisions of Chapter 13 of this Code.
10.3.4 Aviation obstacle sign lights shall be set in accordance with the Civil Aviation Law, ICAO Annex 14 and the People's Republic of China Industry Standard â€œMH50012000â€. The selection of aviation obstacle lights shall comply with the product standards of the People's Republic of China "MH/T60121999 Aviation Obstruction Light" and have relevant qualifications.
10.3.5 When it is necessary to install an aviation obstacle light, the following requirements should be met:
1 The horizontal and vertical distance of the obstacle sign light should not be greater than 45m.
2 The obstacle sign light shall be installed at the highest part of the building or structure. When the plane height of the commanding point is large or is a building group, in addition to installing the obstacle sign light at the highest end, it should be set at the top of the outer corner.
3 When installing the obstacle sign light on the top of the chimney, it should be installed at a position lower than 1.50~3m below the chimney and arranged horizontally in a triangle.
4 The obstacle sign light should adopt the control device of the automatic on/off power supply, and measures to change the light intensity should be provided.
5 The technical standards for aviation obstacle sign lights shall comply with the functions of Table 10.3.5:
Note: The background brightness corresponding to the time period in the table: 50 cd/m2 at night, 50-500 cd/m2 at dusk and dawn, and 500 cd/m2 at night.
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