CuAl (CUPONAL) frequently asked questions

What are the main advantages of Cuponal compared to solid copper busbars?
At the same current carrying capacity Cuponal busbars have a cheaper price and lower weight. This is noticeable especially with larger cross sections.

How can I process Cuponal busbars mechanically (drilling, bending and punching)?
Process Cuponal busbars just as you would process conventional copper or aluminum rails. Also bends of more than 90 degrees are no problem. Neither copper layer nor aluminum core will be damaged.

Does corrosion of Cuponal busbars increase under normal conditions (e.g. indoors) and should it be applied an additional corrosion protection?
No. Under normal conditions, such as, for example, in the Interior, no increased corrosion occurs.

Can I use Cuponal busbars in environments with increased risk of corrosion?
You may experience increased corrosion at the edges and in the area of drilling with increased humidity and the presence of an electrolyte (e.g. sea air). Therefore in case of doubt, we recommend an additional protection against corrosion (e.g. paint, grease, acid-free Vaseline)

Can galvanized screws or screws from stainless steel be used for Cuponal busbars?
Galvanized screws or stainless steel screws can be used under normal conditions.

What quality of copper and aluminum is used for the manufacture of Cuponal busbars?
Cuponal busbars are made of aluminum and copper for conduction purposes (Al  99.5 and Cu  F20 99.9).

What holder distance must I choose to install Cuponal busbars?
In most cases, the same distance of the holder can be used as for Copper busbars.

Are there special holders for Cuponal busbars?
The most commercially available holders can be used for fixation of Cuponal bus bars. If you should choose holders for Cuponal, note however, that about 20% larger cross sections must be used compared to massive copper rails at the same rated current.

How can thermal and dynamic behavior of Cuponal busbars be described in the short-circuit case?
Thermal behavior of Cuponal busbar is similar to copper rail. The dynamic properties range lie between copper and aluminum rails.

Can I find more information on Cuponal busbars in the DIN standard?
For busbars from Cuponal Applies standard DIN 43 670, part 2 (copper-coated rail made of aluminum).


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