In the context of geyser installation, Supply and fit: External isolator, including waterproof box refers to the process of installing an electrical isolator switch outside the building or structure where the geyser is being installed. The purpose of the isolator switch is to allow for safe isolation of the electrical circuit that powers the geyser, which is important for maintenance or repair purposes.

The installation process involves fitting the isolator switch inside a waterproof box to protect it from exposure to the elements and prevent water from entering the electrical circuit. The waterproof box is typically mounted on a suitable surface, such as a wall or post, and the cable gland is installed to seal the cable entry point. The live, neutral, and earth wires are then connected to the isolator switch, and the installation is tested to ensure that it is functioning correctly.

It is important to note that the installation of the isolator switch and waterproof box should be performed by a qualified and licensed electrician to ensure that all safety regulations and guidelines are followed. In addition, it is essential to follow the manufacturer's instructions for the geyser installation and to ensure that all electrical connections are properly secured and insulated to prevent any electrical hazards.