How many extension blocks or receptacle strips are allowed on the same branch circuit?

• A. One
• B. Two
• C. Three
• D. Unlimited

Answer: (A)

You should not chain or stack extension blocks on a single branch circuit. The rule allows only one extension block or receptacle strip on a given branch circuit because adding more does not increase the circuit’s capacity and can hide overloads, cause overheating, and defeat proper overcurrent protection. A single strip consolidates outlets in one location and keeps total load within what the circuit and the strip are rated for. If more outlets are needed, the safer approach is to install fixed receptacles or use a separate circuit rather than adding another strip.