1： Is the main switch of the street lamp 3P or 4P?
If it is an outdoor lighting fixture, in order to avoid the danger caused by leakage, a leakage switch will be installed, and a 4P switch should be used at this time. If leakage is not considered, a 3P switch can be used for the main switch
2： Advantages and disadvantages of different layout methods for street lamps
Unilateral arrangement - suitable for narrow roads, it requires the installation height of the lamps to be equal to or greater than the effective width of the road surface. The advantages are good inducement and low cost, but the disadvantage is that the road surface brightness (illuminance) on the side without lights is lower than that on the side with lights installed.
Interlocking arrangement - It is required that the installation height of the lamps should not be less than 0.7 times the effective width of the road surface. The disadvantage is that the vertical uniformity of brightness is poor, and the inductivity is not as good as that of single-sided arrangement. Symmetrical arrangement - it is required that the installation height of the lamps should not be less than half of the effective width of the road surface.
3： Reasonable selection of installation height, cantilever length, and elevation angle for street lamps
Installation height (h) - The economical installation height for gas discharge lamps is 10-15 meters. The glare of lighting fixtures installed at a low height increases, while those installed at a high height decrease, but the lighting utilization rate decreases.
Cantilever length - should not exceed 1/4 of the installation height. The impact of excessive cantilever length:
Reduce the brightness (illumination) of the sidewalk and curbstone on the side where the lights are installed.
The mechanical strength requirements for cantilevers have increased, which affects their service life.
◆ Affects aesthetics and causes a mismatch in the proportion between the cantilever and the lamp post.
The cost will increase.
Elevation angle - The elevation angle of the lamp should not exceed 15 degrees.
The installation angle of the lamp is to increase the horizontal illumination range of the lamp on the road surface. Excessive exposure can increase glare and reduce the brightness of slow lanes and sidewalks.
4： Reasonable power compensation selection for street lamps
By adopting a single lamp distributed compensation method, the power factor of various lamps can be increased to 0.9 or above, thereby reducing the capacity of street lamp dedicated transformers by more than 51% and reducing line losses by about 75%, which has a significant energy-saving effect.
