Electric cables with metallic protective sheaths

An electric cable protected by a corrugated hollow metallic sheath composed of an aluminum alloy having the following composition in percentage by weight:

• manganese 1.0-1.5, magnesium 0.8-1.3, balance aluminum;
• wherein a specimen of the hollow sheath having a length of 150 millimeters exhibits a radial deformation not exceeding 5% upon application of a crushing force of 1000 pounds;
• wherein the sheath has an outer diameter D and a sheath thickness S, where S is defined by the thickness of the sheath, said sheath having a D/S ratio approximately defined by the equation D/S=1.1[D]+10 wherein D and S are defined in millimeters or by the equivalent equation D/S=2.6[D]+10 wherein D and S are defined in inches:
• and wherein an increase in the crushing force applied to the specimen within the range of 1000 to 1600 pounds produced a corresponding decrease within the range 95% to 0.65% in the radial diameter of the specimen.

An electric cable protected by a corrugated hollow metallic sheath composed of an aluminum alloy having the following composition in percentage by weight:

• manganese 1.0-1.5, magnesium 0.8-1.3, balance aluminum;
• wherein a specimen of the hollow sheath having a length of 150 millimeters exhibits a radial deformation not exceeding 5% upon application of a crushing force of 1000 pounds;
• wherein the sheath has an outer diameter D and a sheath thickness S, where S is defined by the thickness of the sheath, said sheath having a D/S ratio approximately defined by the equation D/S=1.1[D]+10 wherein D and S are defined in millimeters or by the equivalent equation D/S=2.6[D]+10 wherein D and S are defined in inches:
• and wherein an increase in the crushing force applied to the specimen within the range of 1000 to 1600 pounds produced a corresponding decrease within the range 95% to 0.65% in the radial diameter of the specimen:
• and wherein the range of the D/S ratio as plotted against D over a diameter range of 10 to 100 millimeters increases linearly from 20 at a diameter of 10 millimeters to 100 at a diameter of 100 millimeters.