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B. Substation Single-Line Diagrams _____ 1. Collector Substation _____ 2. Distribution Substation _____ C. PT/Laboratory _____ Have trainees examine a single-line substation drawing with a matching legend. Ask them to interpret the symbols, letters, and numbers associated with For pipeline, refinery, and industrial clients, we offer substation design and power distribution system services. From feasibility studies to detailed design and project management, through construction support, EN Engineering is a trusted provider of engineering services to the electric utility and telecommunications industries.