OSHA signs are the perfect way to alert your employees and guests when a hazard is present in your facility. Keep your facility safe, buy an OSHA regulated sign today and prevent an accident tomorrow. These OSHA signs comply with OSHA 29 CFR 1910. 145. OSHA Compliant. Complies With All Safety Regulations. Aluminum. 7"x10". National Marker "Danger 480 Volts" Safety sign measuring 7" x 10" is made of 0. 040" aluminum material for durability.