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In air insulated outdoor switchyard, an equipment is connected to conductors through connectors and conductor to conductor overhead connection are through clamps and tee connectors. Erection Key Diagram (EKD) is a drawing in which requirement of various kinds of connectors and clamps are identified and BOQ is formed for procurement. The BOQ also includes quantity of conductor, shield wire and Aluminium tube bus.
The drawing is prepared on the basis of Purchaser's technical specification and relevant national/international standards.