National Marker Company Sign with legend ?! DANGER - Electrical hazard authorized personnel only? is specifically designed to restrict unauthorized people from entering a potentially hazardous zone with high electrical voltages. It is often used to keep the employees safe when around the restricted zones and thus, maintaining a safe environment. As a part of safety-related signage; this sign manufactured using premium material that boosts the durability and induces impeccable strength to withstand extreme weather. The ANSI danger sign with bold and legible text is clearly visible in busy premises and corridors. The crystal-clear Sign Muscle coating on the sign boosts clarity of text, while it simultaneously protects from pre-mature fading, and environmental damage.