Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation.The interconnected lines which facilitate this movement are known as a transmission network.
This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution.
The combined transmission and distribution network is known as the "power grid" in North America, or just "the grid".In the United Kingdom, the network is known as the "National Grid". A wide area synchronous grid, also known as an "interconnection" in North America, directly connects a large number of generators delivering AC power with the same relative frequency, to a large number of consumers. For example, there are four major interconnections in North America (the Western Interconnection, the Eastern Interconnection, the Quebec Interconnection and the Electric Reliability Council of Texas (ERCOT) grid), and one large grid for most of continental Europe.Źródło: https://en.wikipedia.org/wiki/Electric_power_transmission
An electrical contractor is a business person or firm that performs specialized construction work related to the design, installation, and maintenance of electrical systems?a $130 billion industry in the United States.1 An electrical contractor is different from an electrician; an electrician is an individual tradesman and an electrical contractor is a business person or company that employs electricians.
Both usually hold licenses and insurances to properly and safely operate a business, protecting the employees and home owners/business owners from insurance liabilities.These requirements vary from state to state. Electricians may work for an electrical contractor, or directly for individuals or companies.Źródło: https://en.wikipedia.org/wiki/Electrical_contractor
Electrical contractors employ workers in many capacities, determined by their level of training and experience.