Occupational Standards for Engineering must be followed by all construction companies that have involvement in electronics. Any building will have a supply of electricity and therefore anyone dealing with that aspect of construction must have a electro-technical certification.
"National Occupational Standards" are a set of statements for individuals which explain the levels of performance that they must achieve when carrying out functions within a workplace. There are many different national occupational standards created due to the requirements that must be met within different industries.
When setting standards within an industry, employers within the specific industry must define the skills that are required in employees in order for them to work within the sector. There are many organisation in the UK that provide a service of helping employers indentify the skills they need in an employee to then go on to create their personal set of national occupational standards for their business.