Cables Unlimited LED Emergency Beacon Road Flare - Red NOV-911 Perfect for color coded electrical work. Provide primary electrical insulation for splices up to 600V UL electrical tape. 3/4"x60' Spool. 7 Mil thick, 600 Volt. This rugged tape will not bubble, telescope, or crack even in extreme temperature UL electrical tape. 3/4"x60' Spool. 7 Mil thick, 600 Volt.