The maximum general purpose branch circuit rating of a flat conductor cable is ____ amperes.

• A. 15 amps
• B. 20 amps
• C. 25 amps
• D. 30 amps

Answer: (B)

The key idea is that the rating of a general-purpose branch circuit is limited by the cable’s listing and conductor size. Flat conductor cable used for general-purpose branch circuits is listed for a maximum of 20 amperes. That means this type of cable can be used on a circuit protected at 20 A, but not safely on a higher rating like 25 A or 30 A, and it isn’t restricted to only 15 A in all cases. The 20 A rating reflects the typical conductor size and insulation of the flat cable, ensuring it can carry the current without overheating under normal conditions.