Grounding is important
In order to have an optimal circuit in the electric fence and thus optimal current, it is absolutely crucial that the energizer is connected to an optimal earth connection.
Therefore, the electric fence must be provided with earth spikes of min. 1, 5 meters located with approx. 3 meters apart. The ground spikes must be placed at least 10 meters from other ground spikes, such as for HFI relays. It is a legal requirement.
If the ground abuts around the spears, more must be fitted. Galvanized steel wire or earth cable can be used as a connection between earth spike and voltage transmitter.
Many people are amazed at how many ground spikes one actually has to use. Yes, the stronger the voltage transmitter you have, the more powerful a circuit you get and here the earth connection must not be the weakest link. To stick to the water metaphor, one can compare the earth connection with a well that must be able to receive the amount of water that comes, otherwise it runs dry. This can result in horses or humans being shocked when standing on the ground.