Fire-resistant coaxial cables are described as well as methods to manufacture them. The 
dielectric between the coax cable's central conductor and outer coaxial conductor ceramify under 
high heat, such as those specified by common 
fire test standards (e.g., 1850° F. / 1010° C. for two hours). The 
dielectric can be composed of ceramifiable 
silicone rubber, such as that having a polysiloxane matrix with inorganic flux and 
refractory particles. Because thick 
layers of uncured ceramifiable 
silicone rubber deform under their own weight when curing, multiple thinner 
layers are coated and serially cured in order to build up the required thickness. A sacrificial sheath mold is used to hold each layer of uncured ceramifiable 
silicone rubber in place around the central conductor while curing. The outer conductor can be a 
metal foil, 
metal braid, and / or corrugated 
metal. Another layer of extruded ceramifiable silicone 
dielectric or an outer wrap of 
ceramic fiber yarn surrounds the outer conductor and continues to insulate it from the outside if a 
low smoke zero halogen jacket burns away. Methods of testing and installation are described.