New York State Master Electrician Practice Exam

What are Class 2 and Class 3 cables suitable for according to general use regulations?

1. Environmental air spaces

2. General purpose use

3. Outdoor installations

4. Temporary wiring

The correct answer is: General purpose use

Class 2 and Class 3 cables are specifically designed for low-voltage applications and are recognized for their safety features in various installation scenarios. These cables are capable of carrying power or communication signals under 60 volts for Class 2 and under 100 volts for Class 3, making them suitable for a wide range of general-purpose uses, such as in security systems, fire alarm systems, and certain types of lighting systems. The regulations governing these cables facilitate their use in applications where increased safety measures are required due to their lower voltage and current capacities. This designation allows for flexibility in installation, as Class 2 and Class 3 cables can be used in areas that may not permit higher voltage cables, thus emphasizing their appropriateness in general installations without needing more stringent requirements. In contrast, the options related to environmental air spaces, outdoor installations, and temporary wiring are typically subject to more stringent codes and regulations. While specific installations may permit the use of Class 2 and Class 3 cables in those scenarios under controlled conditions, they do not represent the primary intended application of these cables. Therefore, identifying Class 2 and Class 3 cables as suitable for general-purpose use aligns with their design characteristics and regulatory approval.