Supply and fit: Internal isolator complete when installing a geyser refers to the process of installing an electrical isolator switch inside a 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 an electrical enclosure or box, typically located near the geyser. The enclosure should be suitable for indoor use and provide protection from moisture and other environmental factors. 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 internal isolator switch 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.