This technical report is for use as a guide for temporary installations provided only for the period of construction, during which they may be frequently modified and relocated. They are dismantled and removed upon completion of the works. The object of this report is to give more detailed guidance on the application of the requirements of IEC 364 to these particular types of installation, in a form convenient for use by persons concerned with these types of installation. To make it easier for users, definitions are repeated, and several examples of important items are listed. It describes practical means of satisfying the requirements, based on experience and practice, but it does not exclude the use of other means which provide the same level of safety and reliability.