Fingrid publishes different brochyres and guides on safety close to transmission lines. The publications can be found from the section Publications, under the sections News. Included in the publications in English are for example brochyres Living adjecent to transmission line and Welcome to work on the transmission grid in Finland.
Below is a direct link to section:
Working at a substation requires local instruction on-site
Under normal conditions, the electricity grid and its equipment do not cause danger, if instructions and safety distances based on these instructions are observed. This guide booklet gives instructions for moving about and working at substations managed by Fingrid.