What is the minimum conductor size specified for DC circuits in Article 690?

The minimum conductor size specified for DC circuits in Article 690 is 10 AWG. This size is established to ensure that the conductors can carry the necessary current without overheating and to reduce the risk of voltage drop, which is particularly important in solar photovoltaic (PV) systems where efficiency is critical.

In the context of DC circuits, conductor sizing must also consider factors such as the ambient temperature, the installation conditions, and the total current flow. The National Electrical Code (NEC) sets forth this requirement to promote safety and reliability in solar energy systems.

Using a conductor size smaller than 10 AWG could lead to excessive voltage drop and potential overheating, creating safety hazards. Conversely, larger conductors can be used if necessary, but the minimum standard is aimed at balancing safety, efficiency, and cost. Additionally, the NEC also specifies other conditions under which different sizes may be needed. It is important for installers and engineers to be aware of these standards to ensure compliance and optimal performance of the system.