The 1971 edition of IS 6060 outlines detailed procedures for incorporating natural lighting in factory structures located in tropical regions. It defines ideal brightness levels for different manufacturing activities, principles for window and roof light design including north light configurations, and examines elements influencing daylight penetration such as glazing characteristics and obstructions. This code serves as a critical resource for architects, engineers, and planners focused on enhancing workplace comfort, energy efficiency, and visibility in industrial settings.
Overview
The 1971 edition of IS 6060 outlines detailed procedures for incorporating natural lighting in factory structures located in tropical regions. It defines ideal brightness levels for different manufacturing activities, principles for window and roof light design including north light configurations, and examines elements influencing daylight penetration such as glazing characteristics and obstructions. This code serves as a critical resource for architects, engineers, and planners focused on enhancing workplace comfort, energy efficiency, and visibility in industrial settings.
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Frequently Asked
IS 6060 specifies illumination targets in lux for a range of industrial tasks, ensuring adequate visibility for worker efficiency and safety. For example, blending and carding operations require about 300 lux (daylight factor 3.75%), while fine assembly work may need up to 700 lux (8.75%). The daylight factor is calculated by dividing the illumination in lux by 80. Additionally, attention to light color quality and supplemental local lighting for precision tasks is advised.
The standard recommends using horizontal or gently sloped glazing over vertical or steeply inclined glass for better daylight efficiency. It considers a solar altitude of 15° as the design baseline, with daylight intensity increasing 1.2 to 1.5 times around noon on clear days. Typical design parameters include sill heights from 5 to 8 meters and bay widths of 4, 7, or 10 meters. Use of diffusing glass with specified transmission factors is encouraged to reduce glare, and illumination calculations can be performed using either the lumen or point-to-point methods.
Recommended glazing types include transparent window glass (transmission 0.80 to 0.85), patterned glass (0.70 to 0.85), wired rough cast glass (0.60 to 0.80), sand blasted glass (0.60 to 0.80), clean acrylic plastic sheets (0.80 to 0.85), clear rigid PVC (0.80), wired rigid PVC (0.70 to 0.75), and corrugated glass fibre sheets (0.55 to 0.80). A transmission coefficient of 0.85 is often used as a design baseline, adjusted for dust and obstructions. Diffusing glass is recommended for roof lighting to minimize glare.
The standard advises identifying all potential obstructions such as structural members, equipment, and nearby buildings early in the design phase to minimize daylight reduction. A glazing transmission coefficient of 0.85 is adjusted downward to account for dust, sashes, and shading from obstructions. The effective daylight factor is calculated by multiplying the base daylight factor by the transmission coefficient and an obstruction reduction factor less than or equal to one, ensuring a minimum daylight factor of about 1.25% is maintained.
IS 6060 outlines two primary methods: the point-to-point method, used when the size and location of glazing are known, which calculates illumination at specific indoor points; and the lumen method, applied when the required illumination level is predetermined, treating daylight similarly to artificial lighting in calculations. The design typically assumes 16,000 lux for total sun and sky illumination, with adjustments for glazing transmission and maintenance factors.
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