National Marker Company sign alerts workers, employees or individuals about a high voltage area and informs that only authorized personnel are allowed inside it. It is mostly used to in office and industrial facilities to prevent electrical hazards. The danger signage has the legend âDANGER - HIGH VOLTAGE - AUTHORIZED PERSONNEL ONLYâ printed in bold and legible font to give more readability. The sign is UV resistant, chemical resistant and graffiti proof. It has White text on a Red base and Black text on a White base. The rectangular danger sign complies with OSHA 29 CFR 1910.145 standards and has an NMC Sign Muscle coating to protect the text against fading, scratches, scuffing, mold, and moisture. The UV- cured, clear coating creates a strong bond and boosts the color and clarity.