Cable spacer shall be used with approved cable ties at
intervals of not greater than 8 inches (203.2mm) to maintain
separation between wires in order to prevent relative motion
between harnesses in critical applications. The spacer design
shall provide smooth, rounded edges in order to not accelerate
abrasion between itself and a wire bundle. The spacer shall
maintain a distance between parallel wires of greater than 0.5
inch (12.70mm) or alternatively 0.3 inch (7.62mm), and shall
maintain a distance between perpendicular wires at greater
than 0.3 inch (7.62mm). The cable spacer shall weigh less
than 0.75 gram.