Regulating apparatus and instruments, apparatus for regulating electricity; testing apparatus, not for medical purposes, in particular for solar technology; devices for conducting, switching, transforming, accumulating, regulating and/or controlling electricity; electrical and electronic circuits; voltage surge protectors, electrical conduit control systems, protective systems for solar, photovoltaic and energy supply installations, mainly consisting of apparatus for analysis and monitoring of energy supplies, of tensions and current passages as well as for analysis and monitoring the temperature of energy supply apparatus; transformers, inverters, converters, direct current converters, accumulators as well as measuring and control devices therefor; solar plant systems for electricity generation