This guide deals with the distribution transformer construction (core, windings, cooling, tank & cover, conservator, pressure relief device, Buchholz relay, silica gel breather, winding temperature indicator, etc. ), transport & packing & despatch, installation procedure, fittings & accessories. This Manual applies to all cast-resin dry-type Cast-resin dry-type transformers are widely used transformers of Siemens with three-phase and single- indoors, especially in fire hazard areas and underground phase, including special purpose transformers such as: flooding areas. Generally, cast-resin. The way a transformer is handled and the procedures that are used to receive, assemble, process and test the transformer are of fundamental importance to the long life of the transformer. Therefore, extra caution is needed when selecting transformers. 1 Pre-installation Requirements for Complete Distribution Cabinets, Control Cabinets, and Distribution Boxes: - The indoor ceiling and wall decoration works should be completed with no water leakage. - The foundation steel and cable trench under. Utilizing GIS tech-nology, both the high-voltage part and the medium-voltage part can be built using metal-enclosed indoor-type switchgear.