Which type of wire is acceptable and most cost-effective for concealed supply wiring of a new appliance in a residential basement?

When considering the appropriate type of wire for concealed supply wiring of a new appliance in a residential basement, NMD (non-metallic sheathed cable, often referred to as "Romex") is a suitable choice due to its versatility and cost-effectiveness. NMD wiring is designed for interior applications and is well-suited for residential environments, including basements, where it can be concealed behind walls or ceilings.

NMD is moisture-resistant and can handle typical basement conditions, making it a reliable option for wiring appliances. Its non-metallic sheath also helps reduce installation complexity and cost compared to metal conduit alternatives, as it is more lightweight and easier to work with for typical residential installations.

In contrast, other wire types may not be as practical for this specific application. For instance, NMW (non-metallic sheathed cable rated for wet locations) and UFB (underground feeder cable) are designed for more specific environments or uses. NM (non-metallic sheathed cable) is similar to NMD but may not have the same specifications for moisture resistance in the context of basement wiring. Therefore, NMD emerges as the preferred and most economical choice for concealed supply wiring in this scenario.