Combined with on-site practical diagrams (such as transformer hoisting diagrams, Transformer Box foundation diagrams, etc. 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. substations with installed power limited to 2000 kVA or two 1000 kVA MV/LV transformers. The purpose of this guide is to give an overview of the guidelines and requirements specified by current regulations for the design and construction nt V1: Syst uary 2008, updated by the Decree of 19 July. 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. See Minimum Distance Marked on Nameplate NEC 450. Filtered air may reduce maintenance if the location of the transformer presents a problem. The transformer shall be installed in the correct position, with complete accessories, the oil level of the oil-immersed transformer shall be normal, and there. In the construction of power systems, the installation quality of transformers and Transformer Boxs directly determines the operational stability and safety of equipment.