1 CHAPTER ONE 1.0 INTRODUCTION Electrical installation and maintenance are a crucial aspect of modern life as it involves the design, installation, and upkeep of electrical systems in residential, commercial, and industrial settings. Electrical installation involves the planning and implementation of electrical systems to ensure that they meet safety regulations and standards. This includes the installation of electrical wiring, circuit breakers, transformers, and other electrical components. The goal is to ensure that electrical systems are safe and reliable for use [1]. Maintenance is the ongoing process of inspecting, repairing, and upgrading electrical systems to keep them functioning effectively and efficiently. This includes regular checks on wiring and components, replacement of damaged or worn parts, and updates to meet changing safety regulations. Regular maintenance can help prevent electrical failures and ensure that systems are always operating at their best. One of the key aspects of electrical maintenance is safety. Electrical systems can pose a significant hazard if not properly maintained, and it is important that only trained and qualified professionals carry out maintenance tasks. This helps to minimize the risk of electrical fires, shocks, and other dangers. In conclusion, electrical installation and maintenance play an essential role in maintaining the safety and functionality of electrical systems in various settings. Regular maintenance and upgrades are crucial to ensuring that electrical systems are always working efficiently and safely [1]. Numerous industrial facilities in Nigeria have legacy electrical systems installed that have been in operation for decades. Over time, these systems have been modified and upgraded to ensure operation and production continues with minimal interruption. From site wide distribution of medium voltage to localized low voltage systems, modifications have left many systems virtually