In accordance with NEN1010:2020 (provision 712.462.101), for the purpose of maintenance, for example, where physical injury may occur, the installation must be provided with an isolating switch. This applies to both the DC and AC sides. The switch is clearly recognizable for laymen and switches off the entire installation. The switch must be capable of being locked or fitted with a warning sign.
This does not apply if the facility to switch off is constantly under the supervision of the person performing the work. The isolating switch shall meet the requirements set out in NEN1010 (provision 536.3.2).
Note: The isolating switch must be suitable for switching the maximum power.