* Type: Twin Twist (T/T or TT) flexible non-sheathed wire. *Structure: Two parallel or twisted copper-conductor cores (typically red and black). * Numbering System: The "14/76" designation means the core consists of 14 strands of copper wire, 41 no copper with each individual strand having a diameter of 0.076 inches (or 0.76 mm depending on regional shorthand). * Voltage Rating: Usually rated for 300/500V