systems a standard for ac or dc, v , phase choice and hz makes sense to avoid the need for both small and big(on the micro scale) transformers and inverters to standardise the outputs from rooftop pv, wind turbines up the hill, the high and low pressure water power units and the central base load/storage...
storage and organization bath and kitchen bath and kitchen hooks cabinet shelves drawer organizers hair and beauty organization over the door cabinet organization shower caddies closet organization closet organizers closet rods hangers shoe organization hand trucks and carts hand trucks storage and utility...