An electrical panel schedule shows Circuit 12 as '20A/1P/GFCI'. What type of circuit protection and configuration does this represent?
Correct Answer
D) 20 amp, single pole, with GFCI protection
This notation indicates a 20-amp, single-pole circuit breaker with Ground Fault Circuit Interrupter (GFCI) protection, typically used for bathroom, kitchen, or outdoor outlets.
Why This Is the Correct Answer
The notation '20A/1P/GFCI' follows standard electrical panel schedule conventions where 20A indicates the amperage rating, 1P stands for single pole (not 1 phase), and GFCI specifies Ground Fault Circuit Interrupter protection. Single pole breakers are used for 120V circuits and occupy one slot in the panel. This type of circuit is commonly required in wet locations like bathrooms, kitchens, garages, and outdoor areas where GFCI protection is mandated by the NEC.
Why the Other Options Are Wrong
Option A: 20 amp, 1 phase, with ground fault circuit
While '1P' might seem like it could mean '1 phase,' in electrical panel schedules it specifically means 'single pole.' Additionally, the phrase 'ground fault circuit' is incomplete - the correct term is 'Ground Fault Circuit Interrupter' or GFCI protection.
Option B: 12 amp, single pole, with GFCI protection
Single pole (1P) circuits cannot be 3-phase. Three-phase circuits require three poles and would be designated as '3P' in the panel schedule. A 20A single pole breaker is designed for single-phase, 120V applications.
Option C: 20 amp, 3 phase, with GFCI protection
This option incorrectly reads the circuit number (12) as the amperage rating instead of the actual amperage notation (20A). The circuit number identifies the position in the panel, while the amperage is specifically noted with the 'A' designation.
Memory Technique
Use 'APP' - Amperage/Poles/Protection to remember panel schedule format. Think '1P = 1 Pole = 1 slot in panel' rather than phase.
Reference Hint
Florida Building Code - Electrical, Chapter 2 (NEC Article 210 - Branch Circuits) and panel schedule reading standards
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