Not to be confused with Jacketed Bluewire, which is crafted in a similar manner (except with a Blue Alloy Ingot in place of a Red Alloy Ingot) but serves the function of carrying Blutricity instead of carrying a Redstone current.
Also not to be confused with Red Alloy Wire, which serves the same purpose but requires a block to attach to.
Jacketed Wire is a block added by the RedPower 2 mod. Jacketed Wire carries Redstone currents for a much longer distance than Redstone Dust does; whereas Redstone Dust has a limit of 16 blocks without repeaters and/or inverters, Red Alloy Wire can carry a current for several dozen blocks without need for repeaters or inverters. Jacketed Wire can also connect to Redstone Tubes and provide them with a Redstone current. Jacketed Wire can be used in conjunction and in any combination with Red Alloy Wire.
A generic cover and a generic jacketed wire image is shown here; any type of cover microblock can be used, and the pattern upon the jacketed wire will change accordingly.