Power supplies for lighted shelves in a refrigerator

A refrigerator appliance comprising:

• a cabinet having a temperature-controlled compartment defined therein;
• a first shelf ladder disposed at least partially in the temperature-controlled compartment providing a plurality of shelf mounting positions, the shelf ladder comprising an electrical bus having an electrically grounded first bus conductor a second bus conductor and a third bus conductor;
• a first adjustable shelf carrying a first lighting device, the first adjustable shelf being removably mountable in one of the plurality of shelf mounting positions such that the first lighting device is electrically coupled to the electrical bus when the first adjustable shelf is removably mounted in one of the plurality of shelf mounting positions, wherein the first adjustable shelf comprises a mounting bracket configured to engage the shelf ladder to cantilever the first adjustable shelf in one of the plurality of shelf mounting positions, the mounting bracket comprising a first tab configured to electrically couple to the first bus conductor and a second tab configured to couple to the second bus conductor when the first adjustable shelf is cantilevered in one of the plurality of shelf mounting positions;
• and further providing that the first and second tabs of the mounting bracket are each electrically isolated from a body of the mounting bracket that supports the first adjustable shelf;
• wherein at least one of the second bus conductor and third bus conductor is separated into a first section and a second section such that the first section is exposed in a first slot and forms a first independent circuit with the electrically grounded conductor when the adjustable shelf is removably mounted in the first slot and the second section is exposed in a second slot and forms a second independent circuit with the electrically grounded conductor when the adjustable shelf is removably mounted in the second slot.