Which of the following is a common known fuel package?

Furniture and other furnishings are considered a common known fuel package because they are typically composed of combustible materials that can easily ignite and contribute significantly to a fire's intensity and spread. Items such as upholstered chairs, sofas, and wooden tables contain materials like fabrics, foams, and wood that can burn readily and produce a large amount of heat and smoke when involved in a fire.

In fire investigation, understanding fuel packages is crucial for assessing fire behavior and potential hazards. The presence of various furnishings can create a more hazardous environment, leading to quicker fire development and potentially more severe consequences in terms of damage and risk to life. This vital knowledge allows investigators to reconstruct fire scenes and determine fire origins more effectively.

The other options do not qualify as common known fuel packages. For instance, household appliances, while they may contain some combustible components, primarily function as devices and not as primary sources of fuel like furnishings do. Electrical wiring generally does not burn in the same way that organic materials do; instead, it may serve as an ignition source without contributing substantial fuel. Non-combustible materials, by definition, do not support combustion and therefore cannot be considered part of a fuel package.