How to Tell if You Have a CTL-Rated Panel

Panels are used in all electrical distribution systems regardless of their level of complexity as they provide electrical systems with circuit control and over-current protection. While panels differ in size and design, all panels are mounted in or against a wall and are only accessible from the front. Further, all panels are used exclusively to control light, heat or power circuits. Additionally, CTL-rated panels have the ability to prevent the installation of more than 42 over-current devices or the exact number of devices the panel was designed and rated to handle. Regardless of the way a CTL-rated panel is designed or installed, there are ways to ensure that a panel is CTL-rated even after is installed.

Instructions

1. • 1

     Consult any available documentation available on the age of the panel. Non CTL-rated panels were not produced after 1965 so it is highly unlikely that a non CTL-rated panel will be found in a more modern building.

   • 2

     Inspect the panel to ensure that tandem circuit breakers are installed as opposed to standard breakers. CTL-rated panels are designed to prevent the installation of non-tandem breakers.

   • 3

     Check the panel for a UL mark labeled "CTL" or "Class CTL." Most CTL-rated panels are labeled with the marking in order to help inspectors confirm that the correct type of panel was used during installation.