Nominal power 

The rated power refers to the highest continuous power of an electronic device specified by the manufacturer that can be implemented or generated without affecting the service life or safety.In this context, the rated power is binding - this means that changes due to aging, damage or wear are not permitted.

If there is a constructive reason for a reduction of the nominal power, an expert opinion by the main customs office is obligatory.

Compare also the article on "rated current".