First the cabinets (new, old and the combination) must be designed according to the codes IEC60364 and NEN1010 (is the dutch interpretation of the IEC60364). The design documents need to be assessed/reviewed to check conformity with the directives. After assessment the cabinets can be constructed according to the IEC60364 and NEN1010. When cabinets are installed on site, they have to be certified. After certification/approval according NEN1010 commissioning can be started. Only when the cabinets are NEN1010 approved the power is allowed to be switched on.