Steel masts are manufactured according to the European standard EN 40-5. Welding processes correspond to basic requirements of the set of standards ČSN EN ISO 3834 and are supervised by an independent testing company. The masts are certified by the Technical testing Institute in Praha and provided with the conformity symbol
CE. The company ELTODO, a.s. is holder of a quality management system certificate to ČSN EN ISO 9001: 2009.
Steel masts are manufactured of rolled metal sheets and welded steel pipes. The material used is of quality class St35, S235JR and has guaranteed chemical compositions and weldability.
Steel masts are distinguished as follows:
• Purpose of the use – lighting, pedestrian crossing, boom and signalling types.
• Mast shape and appearance – pipe-stepped, pyramidal and historical types.
• Way of fixing – anchored and flanged types.
The masts are earthen by earthing wires or strips, approx. 100mm above ground level. Nuts M10, located under covers, are available there just for this purpose.
Masts in standard designs are provided with fixtures for installation of equipment by Elektro Bečov or Schmachtl. The electric equipment consists of a supporting DIN bar, serial terminals and clamps with fuse disconnectors, if used. According to diameters of the cables used, this equipment can be delivered in two alternatives. It can be
fastened to the mast using two screws M8.
Hot dip galvanising
Hot dip galvanising acc. to ČSN EN ISO 1461 is standard surface treatment. The alloyed coat, resulting from the inter-metallic reaction between iron and zinc, can resist to corrosion and corrosiveness of the environment for several tens of years, depending on its thickness (min. 70 μm). The principle of anti-corrosion protection by this
zinc coat is based on its ability to form continuous and resistant layer of zincic carbonate.
As for anchored masts, the inner and outer surfaces of the anchored section are provided with protective asphalt paint Renolak ALN up to the earthing terminal level. As for flange types, the protective paint is applied on the flange and on the inner and outer surfaces of the mast up to the earthing terminal level. The pipe masts can be
provided with the paint upon request, in RAL shades. Historical (cast iron) masts are protected against corrosion by powder coats.
Principles of manipulations and transportation of the mast
Despite the fact that masts with powder coats and hot-dip galvanised masts are quite corrosion resistant, it is necessary to use stacking strips and textile slings for manipulation with them using a crane. When a high-lift truck is used, it is necessary to use plastic sleeves on the forks.