Does NEC require that Class 2 and Class 3 circuits be installed in a raceway?

The National Electrical Code (NEC) does not mandate that Class 2 and Class 3 circuits be installed in a raceway under typical conditions. Instead, the NEC allows for flexibility in the installation of these circuits, as they are designed to operate at lower voltage levels (up to 60 volts for Class 2 and 100 volts for Class 3), which reduces the risk of fire and electric shock when compared to higher voltage installations.

Class 2 and Class 3 circuits can be run in free air or along structures, which can include walls or ceilings, allowing for various installation methods as per the specifications of the installation environment and the local code requirements. However, it is crucial to understand that if these circuits are installed in a location where they could be exposed to damage or in a situation where they might violate other NEC conditions (like physical damage rules), then additional protective measures, which might include the use of raceways, could be necessary.

In summary, the rule allows for alternative installation methods rather than requiring raceway installation, thereby making it clear that the premise of the question aligns with a more flexible interpretation found within the NEC.