Work at power lines in live-line work technology or work in the vicinity of voltage or in off-line work, requires the appropriate assembly of the safety equipment. The set of tools and equipment includes group for securing the workplace and for performing appropriate assembly: repair, maintenance or switching operations in overhead lines, cable lines or distribution devices. What's more, the performance of this work can only be carried out by qualified personnel who have the appropriate qualifications, and skilfully use tools and equipment that meet the relevant safety standards. The direct impact on the condition of tools and equipment is to comply with the regulations and instructions for use of the product, as well as storage conditions and control of the technical condition and dielectric properties of the equipment and equipment currently in use. Therefore, it is important to ensure the highest quality of delivered products and regular control of dielectric properties.