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Types of poles – Wooden poles, Concrete poles, Tubular steel poles, Latticed steel tower
Types of poles Line supports or the poles which hold the conductors to a height they are above the ground level. In general, four types of poles are used, depending on the size and shape of the conductor used. i. Wooden poles ii. Concrete poles iii. Tubular steel poles iv. Latticed steel tower i. Wooden […]
Laws of illumination – Inverse square law, Lambert’s cosine law, Light, Electrical method of producing light
Laws of illumination The illumination on a surface depends upon the luminous intensity, distance between the source and surface and the direction of rays of light. It is governed by following laws. 1. Inverse square law 2. Lambert’s cosine law Inverse square law It states that the illumination of a surface is inversely proportional to […]
Three phase cable – they are a. Belted cable up to 11 KV, b. Screened cable 22KV to 66 KV, c. Pressure cable above 66 KV
Three phase cable Commonly, underground cables are used to transmit three phase power supply. For three phase service, the following cables are used. a. Belted cable up to 11 KV b. Screened cable 22KV to 66 KV c. Pressure cable above 66 KV a. Belted cable up to 11 KV The crosssection view of the […]