How must DC wiring systems be installed for safety according to Article 690?

DC wiring systems must be installed in a way that provides adequate protection against environmental factors and potential physical damage. Article 690 emphasizes the importance of ensuring that DC wiring is weatherproofed, which refers to its ability to withstand exposure to moisture and other elements without compromising safety or functionality. Additionally, these wiring systems need to be safeguarded against physical damage, which means they should be installed in a manner that minimizes the risk of mechanical impact or abrasions that could lead to failures or hazards.

The requirement for DC wiring to be weatherproofed and physically protected is critical, particularly for solar power installations, where wiring is often exposed to outdoor conditions. By ensuring that the wiring can resist both environmental wear and mechanical stress, safety is enhanced, fulfilling the NEC guidelines intended to protect persons and property. This underscores the importance of proper installation practices specific to DC wiring systems.