When is a firm obliged to hire a safety technician?

With the enactment of the new law 4488/2017 on labor, every company that employs staff has the obligation to report in detail the responsible Safety Technician in the annual staff list:

Depending on their activity, companies are divided into three risk categories:

A B Γ
Mines Leather industries/Other Textile Industries Agriculture
Mines
 
  Livestock
Pesticide industries of explosive insecticides, fireworks Manufacturers of rubber candles, cosmetics, pharmaceuticals, photographic material, etc. Trade
Textile industries (dyehouses, printing presses, finishing plants)

Transfers from line maintenance workshops

Brokers and agents
Chemical industries Oil and coal producers Focus
Quarries Cement industries Hotels
Oil refining Manufacture of finished metal products (tools, pipes) Transports
LPG bottling  Food & Beverage Industries Warehousing
Manufacture of asbestos Tobacco industries Communications
First iron processing Paper and furniture wood industry Banks
Shipbuilding Forestry, deforestation Insurance
Electricity, Gas Thira, fishermen, salt pans Education
  Petroleum by-products Rentals
  Refrigerated storage Medical
    Services