Which of the following are potential sources of ignition for LP gas?

Fans and electrical switches are indeed potential sources of ignition for LP gas because they can create sparks or heat that ignite gas vapors if there is a leak. Electrical devices can produce static electricity or engage in switching that might create an arc, particularly if they are not properly maintained or designed for environments where flammable gases are present. In contrast, non-conductive materials, water, ice, and heat-resistant equipment typically do not create sparks or direct heat sources that could ignite LP gas. This makes fans and electrical switches a significant concern when considering safety around LP gas handling and storage. Always ensuring proper maintenance and using equipment rated for use in potentially explosive environments is critical to minimizing ignition risk.