This tubing provides an excellent insulating layer and flashover protection over copper or aluminium busbar. Insulating Tube use of the tubing provides equipment designers an ability to reduce the air spacing between busbar heat shrink sleeve by providing insulation enhancement. Its built-in flexibility can be used on irregular shapes without creasing of the tubing occurring. It has excellent resistance to tracking and weathering. Can be used indoors or outdoors. https://thepcatech.com/product/heat-shrink-busbar-insulating-tubes-medium-wall-tubing/