GENERAL INFO
Wind zones are essential to choose the CML pali column among the poles produced by the company, which can be classified as follows:
Lighting columns (single or double arm bracket)
- STRAIGHT STEPPED COLUMNS: designed and built to sustain one or more lamps or projectors
- STRAIGHT CONICAL COLUMNS: designed and built to sustain one or more
lamps for lighting or projectors - CURVED CONICAL COLUMNS: single arm bracket, designed and built to sustain one lighting lamp
- CURVED CONICAL COLUMNS: double arm bracket, designed and built to sustain two lighting lamps
- OCTOGONAL AND POLIGONAL COLUMNS: designed and built to sustain one or more lamps or projectors
- TILTING COLUMNS: designed and built to sustain one or more lamps or projectors
- CYLINDRICAL COLUMNS: prepared for the assembly of arm brackets with lateral attachment; designed and built to sustain one or more lamps or projectors
- COLUMNS FOR URBAN DESIGN: prepared for the assembly of arm brackets with lateral attachment; designed and built to sustain one arm bracket with lamp
Columns for sustaining equipment or accessories
- COLUMNS FOR TRAFFIC JUNCTION: designed and built to support traffic lights on roads, signs for crossroads, signs and advertising boards, electric or electronic static equipment.
- FLAG POLE COLUMNS: used as flag or sign supports
- CONICAL COLUMNS FOR PENNANTS: used as support of the pennant-folder arm bracket
Columns for overhead lines MT - BT
- STRAIGHT STEPPED COLUMNS FOR OVERHEAD LINE: designed and built to sustain lamps or projectors powered by an overhead cable line suspended at the eye-nut; prepared for the assembly of one column head lamp, one series of fittings with pre-fixed inclination to gather from 1 to 4 lamps at the same time, simple, double, triple arm brackets, cross-members for mounting projectors, a power supply line with BT electric cable (max voltage 400 Vac).
- OCTOGONAL AND POLIGONAL COLUMNS FOR OVERHEAD LINE: designed and built to sustain an electric overhead line realized in bare wires or overhead cable
CHOICE OF CML LIGHTING COLUMNS BASED ON WIND ZONES
The necessary features to choose the CML column needed for a specific lighting system are the following:
Height above ground of the installation point of the floodlights
It is the height measured from the lighting plane to the central point of the projector in question: if the projectors will be installed in two overlapping rows it is advisable to evaluate the average height. The required height must be rounded to the upper standard height of the column.
Quantity, dimensions and features of floodlights
It is necessary to have precise data relating to the quantity, unit surface area exposed to the wind, unit weight, brand and model of the floodlights in order to make choices about the type of column needed.
With this data you can:
- calculate the total surface of the floodlights exposed to the wind
- check the suitability of brackets and accessories to allow the installation of the floodlights
Wind zones and conditions of chosen area to install CML columns
This data is needed to determine the forces acting on the CML columns and floodlights and, consequently, identify the performance of the columns based on wind zones. The calculation of the windiness (Vref) is carried out by applying the parameters indicated by the Eurocode UNI ENV 1991-2-4 standard reported in the Ministerial Decree 16/1/96 Technical standards relating to the general criteria for the safety verification of constructions and loads and overloads and by the Circular of the Ministry of Public Works n° 156.AA.GG/STC.
NOTE: TO MAKE THE CHOICE, THE INSTALLATION PLACE OF THE CML COLUMN MUST BE CLEARLY DEFINED; THE MUNICIPALITY AND PROVINCE OF THE INSTALLATION LOCATION AND THE ALTITUDE OF THE INSTALLATION PLACE MUST BE SPECIFIED.
Installation areas based on wind zones
Zone 1
+1000 s.l.m. Vref, 0 25 m/s (0,012)
Valle d’Aosta, Piemonte, Lombardia, Trentino Alto Adige, Veneto, Friuli V. G.
Zone 2
+750 s.l.m. Vref, 0 25 m/s (0,024)
Emilia Romagna
Zone 3
+500 s.l.m. Vref, 0 27 m/s (0,030)
Toscana, Marche, Umbria, Lazio, Abruzzo, Molise, Campania, Puglia, Basilicata, Calabria
Zone 4
+500 s.l.m. Vref, 0 28 m/s (0,030)
Sicily and province of Reggio Calabria
Zone 5
+750 s.l.m. Vref, 0 28 m/s (0,024)
Sardinia (area to the east of the line connecting C. Teulada and La Maddalena Island)
Zone 6
+500 s.l.m. Vref, 0 28 m/s (0,030)
Sardinia (area to the west of the line connecting C. Teulada and La Maddalena Island)
Zone 7
+1000 s.l.m. Vref, 0 28 m/s (0,024)
Liguria
Zone 8
+1500 s.l.m. Vref, 0 30 m/s (0,012)
Province of Trieste
Zone 9
+500 s.l.m. Vref, 0 31 m/s (0,030)
Islands (with the exception of Sicily and Sardinia) and open sea
Vref = Vref, 0+(coefficient for each meter above the zone limit quota-M)
“M” = [ installation height in metres – limit altitude of the affected area ]
For installations at altitudes lower than the limit altitude Vref = Vref, 0
In RED: limit altitude of the affected area
In GREEN: Base reference wind speed
In YELLOW: coefficient for each meter above the zone limit quota
Terrain category
I Marine coast. Lake coast with windward length of at least 5 km. Flat ground, without obstacles.
II Cultivated land surrounded by hedges, some small agricultural buildings, houses or trees.
III Suburban or industrial areas and permanent forests.
IV Urban areas where at least 15% of the surface is covered with buildings with an average height greater than 15 m.
Columns performance table
For each series of columns, the table indicates the column performance, expressed as actual square meters of the surface area (of the CML floodlights+accessories+arms or brackets) exposed to the wind in a specific zone and terrain category at a determined zone limit altitude.
Check lighting columns suitability
Ref.: CML pali
