The concentric conductors is copper and aluminum, is entirely consistent with the rules ASTM D 790, D 1248, D 2655, D 2656, UL 854, UL 44 and other standard.
Each material used in the conductor will be compatible with all other materials used in the concentric conductor manufacture.
Concentric conductor consists of one or two conductors which in turn are coated with a bare conductor distributed helically around the conductors.
According to these configurations will have a phase and outer concentric neutral (bipolar), or two phases and these external neutral (tripolar)
Section of all conductors that form the concentric conductor of both phases as the concentric neutral is the same.
The materials used in the manufacture of concentric aluminum conductors formed by wires keychain aluminum 1350.
Aluminum shall comply with the provisions of ASTM B 3 standard and UL 854.
In the phase conductors with 7 wires, will be able to perform welding wires during wiring. Once this process is completed it will not be allowed two welds closer than 15m (50ft).
Each phase conductor will contain an insulating layer of PE for temperature of 90 C. in the bipolar cables, over the insulating layer will be the braided neutral conductor helically with a passage between 8 and 16 times the outer diameter. In the tripolar cables over the isolation of each phase will have a PVC insulation filling in the joint of both cables and over this will be placed the neutral conductor.
This last layer besides adding firmness should be smooth in appearance and will not be observed depressions caused by unfilled spaces beneath this layer.
Should not produce bubbles, cuts, tears or the presence of foreign materials that are detectable to the naked eye. Besides the envelope will be well centered.
The features of the tape around the bare conductor shall be performed as follows:
A single layer of tape with a convenient width helically applied without wrinkles or folds and with an overlap of at least 6mm. The tape will consist of nylon, with a thickness of at least 0.09mm.
|Features||#8 x 2||#8 x 3||#6 x 3||#4 x 3||#2 x 3|
|No. Of wires||7||7||7||7||7|
|Wire diameter (m.m.)||1,234||1,234||1,555||1,961||2,473|
|phase diameter (m.m.)||3.71||3.71||4.67||5.89||7.42|
|Phase area (mm²)||8,367||8,367||13.3||21.15||33.62|
|Nominal electrical resistance C.C. a 20°C Ohm/Km.||3.43||3.43||2.16||1.36||0.855|
|Nominal weight Kg/Km||22.69||22.69||36.07||57.37||91.21|
|Phase Insulation thickness (m.m.) (PE)||1.14||1.14||1.14||1.14||1.14|
|Diameter over insulation||5.99||5.99||6.95||8.17||9.7|
|Neutral||No. Of wires||37||37||37||65||65|
|Wire diameter (m.m.)||0.536||0.536||0.676||0.643||0.823|
|Area of Neutral (mm²)||8.349||8.349||13.280||21.107||34.578|
|Interior Nylon tape thickness (mm²)||0.05|
|Exterior Thickness for PE cover (mm²)||1.14||1.14||1.14||1.14||1.14|