Electrical engineers design, assess and oversee electrical systems used in buildings, infrastructure and industrial settings. Their work may cover power distribution, lighting, emergency supplies, wiring layouts, control systems, motors and equipment. They can prepare technical drawings and specifications, calculate electrical loads, advise on energy use and check that proposed systems meet relevant safety and building requirements. Depending on their specialism, businesses in this category may provide consultancy, feasibility studies, inspections, testing, fault investigation and project management, as well as installation or maintenance through suitably qualified staff or contractors. Customers may include property owners, construction firms, manufacturers and public-sector organisations. Some engineers focus on building services, such as electrical systems for offices and homes, while others work on automation, renewable energy, infrastructure or specialist industrial equipment.