What is the primary purpose of estimation and costing in unit earthing for commercial installations?

Concept:

Estimation and costing in electrical installations, especially for unit earthing, involves assessing the quantity and cost of materials, labour, and other resources needed to create a reliable, safe, and compliant earthing system.

Given

Application: Commercial electrical installation

Focus: Estimation and costing of unit earthing

Calculation

The aim of estimation and costing in earthing systems is not decorative or aesthetic but functional and safety-oriented. It includes identifying suitable materials (like earthing rods, wires, plates), estimating labour requirements, and calculating total expenditure. This ensures the installation meets safety standards and is economically planned.

Other options like eliminating earthing, focusing on aesthetics, or avoiding insulation are incorrect and do not align with the purpose of proper earthing system design.

Final Answer: To determine the materials, labour and costs required for a safe and effective earthing system