Fire-resistant and water-resistant halogen-free low-voltage cables

electric low voltage cable fire resistant and water resistant, including a conductor and a first internal layer to protect it against water based on a polymer compound containing no halogen, crosslinked or not, and a second outer layer consisting in a mixture of a homopolymer or crystalline propylene copolymer and a copolymer of ethylene and at least one a-olefin, optionally with a diene, and an agent having fire retardant properties, characterized by the fact that the relationship of the thickness of the outer layer and the inner layer is between 1 and 7.