What type of cable should be used for PV source and output circuits operating at over 30V when installed in accessible locations?

Type MC cable, or Metal Clad cable, is the correct choice for use in photovoltaic (PV) source and output circuits operating at over 30V when installed in accessible locations. This type of cable is specifically designed to provide protection for electrical circuits and is suitable for use in environments where the cable may be exposed or accessible to individuals.

One of the significant advantages of Type MC cable is its robust construction, which includes a metal shield that enhances its durability and offers superior mechanical protection compared to other types of cables. This protection is crucial for photovoltaic applications where environmental factors and human interaction may occur.

Furthermore, in accessible locations, it is paramount to use a cable that not only meets electrical safety standards but also protects against potential hazards such as physical damage or moisture ingress. Type MC cable is rated for wet locations and can withstand harsh conditions, ensuring safety and reliability in installations.

While the other options may serve in specific applications, they do not provide the same level of protection or suitability for the unique requirements of PV systems operating at high voltages in accessible areas.