Factors behind safe electric wiring
The Hindu : Factors behind safeelectric wiringThe design and planning involve consideration of envisaged load, earthing arrangements and energy conservationThe function of wiring safety codes is to give technical, performance and material standards that would allow proper use of the electrical energy. Materials required for wiring a building depend on factors such as rating of the circuit, type of occupancy of the building, type of electrical system, national and local regulations and conditions in which the wiring must operate. The design and planning of an electrical wiring installation involve consideration of all prevailing conditions such as the type of supply, envisaged load, earthing arrangements, safety aspects and energy conservation. It is essential that adequate provision is made for all services such as lighting, power requirement for A/C, fridge and kitchen heating. Proper planning will avoid the householder to rely on use of long flexible cables and multi-plug adopters which are dangerous and not recommended.Estimation of load requirementAll conductors and switches and other accessories should be having a rating such that they are not exceeded under any circumstance of use. This may be calculated knowing the rating (W) of the lights, fans and equipment connected. The size of the conductor of the circuit should be chosen so as to permit only minimum voltage drop form the inlet to any point in the installation. In each circuit or sub-circuit the fuse shall be such as to match the cable rating to ensure desired protection.InstallationIn the case of concealed wiring,installation should begin immediately on completion of the main structural work and before finishing works such as plastering.In the case of surface wiring, it can be carried out after plastering.Generally, installation should not start before the building is reasonably weatherproof.However, where electrical wiring is to be concealed within the structure as in a RCC building, the necessary conduits or ducts shall be positioned firmly and tied to the reinforcement before concreting. When…More
