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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.
Źródło: https://en.wikipedia.org/wiki/Master_electrician
Encyclopedically about IEC
The International Electrotechnical Commission (IEC; in French: Commission électrotechnique internationale) is a non-profit, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology". IEC standards cover a vast range of technologies from power generation, transmission and distribution to home appliances and office equipment, semiconductors, fibre optics, batteries, solar energy, nanotechnology and marine energy as well as many others. The IEC also manages three global conformity assessment systems that certify whether equipment, system or components conform to its International Standards.
The IEC charter embraces all electrotechnologies including energy production and distribution, electronics, magnetics and electromagnetics, electroacoustics, multimedia, telecommunication and medical technology, as well as associated general disciplines such as terminology and symbols, electromagnetic compatibility (by its Advisory Committee on Electromagnetic Compatibility, ACEC), measurement and performance, dependability, design and development, safety and the environment.
Źródło: https://en.wikipedia.org/wiki/International_Electrotechnical_Commission
Relations service provider and the client
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.