NLC Electrical Grid 2 Practice Test

Bundling conductors means several sub-conductors carry the same phase, so the phase behaves more like a single, larger conductor. This increases the effective radius of the conductors as seen by the electric field, which lowers the line’s inductance and thus reduces the impedance to a greater extent. At the same time, having multiple conductors increases the line’s capacitance to the surrounding environment (to ground) because there is more surface area and a more favorable geometry for storing charge. The result is higher total charging capacitance and lower per-sub-conductor impedance, which together affect the line’s surge impedance and how the voltage rises or falls along the line. So, the statement that bundling increases total charging capacitance and can reduce per-sub-conductor impedance, influencing surge impedance and voltage profile, best describes the effect.