What type of branch circuits shall furnaces be supplied by?

Furnaces should be supplied by individual branch circuits, which are designed to solely serve one specific appliance or piece of equipment. This ensures that the furnace operates with the necessary voltage and current without sharing the supply with other devices, which could potentially lead to power interruptions or overloads. Individual branch circuits help in managing the electrical load effectively, protecting the furnace from variations in power due to other connected devices, and ensuring compliance with electrical codes that often specify such arrangements for energy-intensive appliances.

In contrast, shared or continuous branch circuits would allow multiple devices to draw power from the same line, which could compromise the performance and reliability of the furnace. Dedicated branch circuits, while focused on only one appliance, differ in that they might include specific requirements for certain appliances, whereas individual branch circuits can also encompass a broader range of uses, focusing specifically on ensuring that each device has its unique and adequate wiring support.