As long as no part of the chicken wire touches the ground, or a steel post is set in the ground, it can be electrified. Existing chicken wire fences usually have ground contact somewhere, so electrifying those fences won’t work. For predator control, adding a separate hot wire and connecting the chicken wire to the ground wire is probably a better choice. If you want to keep chickens in, consider using an electric net fence made specifically for poultry.