• ETT Level 3.5: System Analysis and Operation

    Learn how to read and interpret various types of AC and DC diagrams, and apply data found in published data to specific tasks.

    1. Electrical drawings and symbols - Read and interpret ac and dc schematic diagrams, ac three-line diagrams, connection and interconnection drawings, electrical symbols, and ANSI device numbers.
      • ANSI/IEEE Standard Device Numbers Device numbers are specified in ANSI/IEEE Standard C37.2 and are used to identify the functions of a device shown on a schematic diagram.
      • Electrical One-Line Diagram Symbols One-line diagrams are an important means of communicating the components, relationships, and connections within a circuit or electrical system.
      • Power Distribution System Arrangements Several commonly-used distribution system topologies are presented here, along with the pros and cons of each including: radial, radial with primary selectivity, expanded radial, loop, secondary-selective, primary-selective, secondary spot-network, ring bus, and composite.
    2. Manufacturers' product data - Select and apply the data found in manufacturers' published data to testing, troubleshooting, maintenance, and/or repair. Interpret time-current curves.

    External links are provided by our community of test technicians. Please submit any resources that you feel may be helpful to this topic.

    Recommended: Study tips for the NETA exam

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