After stripping), the ground is located and is connected from the transformer to the ground wire (green).
How do you wire a neon transformer?
Some smaller signs have the transformer attached directly to the sign, while larger neon signs have the transformer separated from the sign. Many are labeled to show the terminal specifically for the grounded conductor, and some transformers are also sensitive to connecting to a multi-wire branch circuit. If you encounter broken, exposed, or touching wires, do not connect or operate the neon sign and contact the manufacturer immediately. Gas discharge tubes are used to hold neon or argon gas and provide a closed environment for the gas to be received. They are basically the long glass tubes that light up to give the neon sign its appeal and have electrodes attached to both ends.