What type of raceways are required for DC photovoltaic source or output current inside a building?

The requirement for metal raceways for DC photovoltaic source or output current inside a building is based on safety and performance considerations. Metal raceways provide a number of advantages in this application.

Firstly, metal raceways have superior grounding capabilities which are crucial for the safe operation of electrical systems. Grounding helps prevent electrical shocks and can facilitate the function of overcurrent protection devices in the event of a fault. This is particularly important in photovoltaic systems that deal with direct current (DC), which can present unique challenges in terms of arcing and fault conditions.

Secondly, metal raceways offer protection against physical damage, which is essential in ensuring the integrity and safety of the wiring system, especially when it carries a substantial amount of current and is part of a solar power installation, where exposure to environmental conditions might be a concern.

Additionally, metal raceways can reduce the risk of electromagnetic interference (EMI) that might affect the performance of sensitive equipment often associated with photovoltaic systems.

While other materials may be suitable for certain electrical applications, the specific requirements of DC photovoltaic systems typically dictate the use of metal raceways within buildings for optimal safety and performance.