Electrotechnically instructed person (EiP)
Works exclusively under the direction and supervision of an electrical specialist in a voltage-free state on PV systems or carries out non-electrical work in the vicinity (safe distance) of active systems.

Electrical specialist for defined tasks (ESfdt)
Carry out standardized electrical work on your own responsibility, including disconnection and commissioning. However, with the restriction: Only according to work instructions (checklist) and only in the low-voltage range (up to 1000 V AC / 1500 V DC).

Electrical specialist (ES)
The electrical specialist carries out the necessary work independently, including troubleshooting. Can and may also independently select suitable work equipment. Suitable maintenance of professional competence must be ensured. The corresponding additional qualification is required for live line work.

Live line work (LLW) on photovoltaics
Additional qualification for ES and ESfdt for authorization to work under voltage, if required.
This is not uncommon for systems such as photovoltaics, as a PV system always supplies voltage during daylight hours.

Chief responsible electrical specialist (CRES)
The chief responsible electrical specialist assumes corporate responsibility for electrical safety. Depending on their responsibilities, this may relate to the construction of a power plant or its operation.