Which table in the NEC provides power limitations for DC power-limited fire alarm circuits?

• A. Table 12(a)
• B. Table 12(b)
• C. Table 13
• D. Table 14

Answer: (B)

Power-limited fire alarm circuits have specific maximum power wired into code tables to keep energy use predictable and components safe. For DC-powered fire alarm setups, the applicable limits are found in the second part of Table 12. That section is designed specifically for DC power-limited configurations and tells you the maximum current or power you can have on a circuit given the conductor size and insulation, ensuring the system can operate reliably from the power source (like a central supply or battery) without overheating or overloading.

The first part of Table 12 covers a different category, so when dealing with DC power-limited fire alarm circuits you rely on the second portion. This separation helps installers quickly reference the exact limits needed for DC lighting you’re powering, keeping systems consistent and safe.