This document discusses different types of electrical loads and wiring systems. It describes domestic, commercial, street light, agricultural, industrial, and other loads. It also outlines overhead and underground supply systems. Several wiring systems are covered, including cleat, casing capping, CTS, metal sheathed, and conduit wiring. Each system is described and their advantages and disadvantages are provided. The document provides information on selecting wiring systems based on factors like durability, appearance, cost, safety, and maintenance.