Street Lighting
Steel tubular pole on the street are erected for lighting of streets.
✒Distance from road ends - 1.5
✒Base of pole-Concrete plat-form below base plate
✒Earthing-All poles shall be perfectly eart here
-Earth wire shall be carried through G.I. pipe for its protection.
✒Base plate-mild steel 30 cm x 30 cm x 1 cm.
✒Terminal box-contain fuse, nutral link and earth thi able.
✒Wires from terminal box to run through pipe for tube connection.
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| Street Light |
1.Electric Light Sources :
- Incandescent lamps
- Mercury vapour lamps
- Sodium vapour lamps
- Fluorescent tubes
- Solar panels to Fluorescent tubes
- LEDS (Newly coming up pattern low wattage high illumination)
2.Street Lighting Scheme and its Design:
Important points:
(i)Luminous intensity should be uniform.
(ii)Distance between two pole < 30 m to 35 m.
(iii) All crossings and turns should be provided with street light points.
(iv) Height of lamps should be uniform.
(v) Height of illumination fittings should be based on their spacing and nature of load.
(vi) Street mains may be drawn along the distribution line.
(vii) The neutral conductor of the L.V. system should be used as the return conductor of street lighting system also.
(viii) Switch/time switch should be used for controlling street mains.
(ix) A fuse unit should be provided in each lamp circuit.
(x)Fuse unit shall be fitted on pole at a safe distance from ground level.
3.Basic Requirements of Street Lighting
(i) There should not be glace.
(ii)Objects shall be clearly visible upto 40 meters to the car vehicle drivers.
(iii)The road and the background to be illuminated against the objects on the road. Objects are viewed by contrast.
(iv) Location of lamps, types, surface of road, light distribution on road etc. are equally important.
(v) By less lamp power the distant objects on the road should be seen by the car-drivers.
(vi) Objects on the road get lesser incident light which is normally seen by the viewer and appear to be dark against illuminated road and background.
3.Locations of Lamps and their Advantages :
1.Central mounted
-two lamps back to back.
-Useful for very wide road
-Economical
2.Opposite mounting
-Superior to other methods
-Uniform illumination on road surface
-Used for very wide roads.
3.Stag arrangement
-Lamps on alternate columns, on the opposite side of central strip.
-Very suitable for 15 meter wide road on both sides of which there are foot-paths at extreme ends.
4.Single side mounted
-For bends with radius with less than 75X height of mounting.
-Not for straight roads.
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