Menu (linked Index) Electric Power Line Structures Last Update: August 3, 2026 Introduction The Electricity Grid Transmission/Sub-transmission Structures Typical North American Distribution Pole Introduction The electrical grid relies on a specialized hierarchy of structures designed to transport power safely across vast distances and into residential neighborhoods. These structures range from massive steel transmission towers to
Menu (linked Index) From the Grid to Residential Circuits Last Update: August 3, 2026 Introduction United States Power Grid System From the Power Plant to the Home (Transmission, Distribution) Home Breaker Panel/s Home Circuit Classification Home Circuit Example 1 (simple branched circuit) Home Circuit Example 2 (dedicated circuit off of a subpanel) Appendix 1 –
Menu (linked Index) Transformers Last Update: January 8, 2026 Introduction Transformer Descriptions Transformers Across the Grid Transformer Governing Equations Transformer Classifications Transformer Characteristics by Grid Level Anatomy of a Residential Pole Transformer How a Pole Transformer Connects to Your House Transformer Size and Rating Appendix 1 – Assumptions for Idealized Transformer Equations Introduction The electrical
Menu (linked Index) Wye and Delta Three Phase AC Circuits Last Update: January 14, 2026 Introduction Three Phase Electrical Power Generation Phase Meanings Electrical Sources and Loads Wye (Star) 3-Phase Circuit Wye (Star) 3-Phase Circuit Example Delta 3-Phase Circuit Delta 3-Phase Circuit Example Balanced Circuits Wye and Delta Circuit Configurations Along the Grid Appendix 1
