The NESC requires a safety sign at each entrance to an electric supply station and on each side of the fence. Almetek Manufactures a wide variety of Substation Safety and Identification signage – Choose from a selection of standard Aluminum, Polyethylene, Lexan or Porcelain Warning/Danger Signs, or have your sign customized to include your logo, colors, text, images, etc. Styles include Printed, Reverse Print (Lexan) Engraved and optional Reflective. Standard sizes are 7×10 or 10×14. Custom sizes available.