Cable Trunking of H.S.is an enclosed wire management system designed to support and protect electrical wires and cables. HT1- IR Inside Riser is one of the components,used as vertical downward bend. There are various types and sizes of trunking. Learning about the different options is essential. Below are popular trunking types: Cable trunking. In this type of trucking system, the lid is kept in place by turnbuckles.Bus-bar trunking. In this trunking type, copper or aluminum is used to protect the components.Lighting trunking. This trunking type is installed with the opening facing downward. It is commonly used for luminaries.Multi-compartment trunking. This type of trunking system allows for the separation of different services and voltages.