Arc lamp The principle of an arc lamp is that when two electrodes carrying current are separated through a small distance, an arc is struck between them. The arc lamps were used in the past for street lighting purposes but nowadays these are used when extreme brightness is required. Carbon arc lamp is most commonly […]
Mercury vapour lamp On the basis of pressure inside the discharge tube, the mercury vapour lamps are classified as High pressure mercury vapour lamp and Low pressure mercury vapour lamp. High pressure mercury vapour lamps are classified as: 1. MA type (Mercury vapour lamp with auxiliary electrode) These are operated at 220 ‐ 250 volt, […]
Classification of cables a. According to the rating of voltage the cables are classified into i. Low tension cables up to 1 KV ii. High tension cable up to 11KV iii. Super tension cables 22 KV to 33KV iv. Extra high-tension cables 33KV to 66 KV v. Oil filled cables 66KV to 132 KV vi. […]
