OSHA Warning Safety Sign: Electrical Hazard - Authorized Personnel Only. Provide a warning that an area contains a potential electrical hazard. Restricts access to areas with electrical hazards to authorized personnel only in order to prevent electrical injury. Available in two sizes and eight materials, including Adhesive Dura-Vinyl™ which adheres to most surfaces easily and is excellent in harsh environments. Newer ANSI-style signs and labels are gaining in popularity and are recognized by OSHA as an acceptable safety notification device. Warning header indicates a hazardous situation that, if not avoided, could result in death or serious injury.