What property do lead sheaths primarily enhance in electrical applications?

Lead sheaths are primarily used in electrical applications for their ability to enhance moisture resistance. This is important because moisture can lead to corrosion and deterioration of the electrical conductors within cables, potentially causing failures or safety hazards. The lead sheath acts as a barrier, preventing moisture from reaching the internal components, thereby ensuring the integrity and longevity of the electrical system.

While flexibility, electrical conductivity, and heat resistance are valid properties in electrical applications, they do not specifically relate to the primary purpose of lead sheaths in this context. Lead is not known for its conductivity advantages compared to other materials typically used in electrical applications, and while it can offer some degree of thermal properties, the central role of lead sheaths is particularly their capacity to protect against moisture ingress.