What master electrician does?
In theatre, the master electrician (or chief electrician in the UK) is responsible for implementing the lighting design for a production drawn up by the lighting designer. This involves overseeing the preparation, hanging, connection and focusing of stage lighting fixtures.
This can be done on a show-by-show basis, or as a resident position of a specific theatre. The tool of the trade of the theatrical master electrician is the adjustable spanner or crescent wrench, used to secure stage lighting instruments from lighting positions in the theatre. This wrench is typically attached to the belt or wrist with a lanyard, which is important because the master electrician tends to work at great height, from ladders, lift tables, catwalks, or lighting trusses, where a falling wrench may hurt people or damage property below.
Electrical contractor - by Wikipedia
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.
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.
Cooperation electrician - customer
As in most of the industry, also in the case of electrical services such as repair of electrical installations and the like services, longer cooperation is beneficial to both contracting parties. In the case of electricity and its principal advantages are significant enough that, thanks to them we can, for example, to increase their own safety. Electrician who is familiar with the electrical system of our building and who is exercising over her custody certainly much faster and more efficiently will also remove any irregularities. Here cooperation electrician and his client is so important that many owners especially larger objects to such cooperation prevails.