Requirements for construction power box Construction power distributor

I also got a distributor at Kleinanzeigen for 220 EUR and built in a FI (type B) for 140 EUR (trusted online retailer - no brand product). Additionally, I fiddled in an old lockable main switch. Now the resale value will probably decrease due to lower demand. But I think I could maybe get 400 EUR for it, and I would be more than satisfied with that. Keep in mind that a 22 kW distributor (2 x 16 A CEE and one 32 A) might be too small for a crane. Older - also smaller - models often have a 63 A plug on the supply line. That’s why I also hammered in a 63 A CEE socket instead of the 32 A socket, which I protected with 50 A. That is technically okay. The biggest problem is the installation space. With the smaller distributor boxes, you can’t close the door anymore when a 63 A plug is inserted. For me, it just barely worked. Disclaimer: Stay away from electricity if you don’t know what you are doing.