NASCLA Commercial General Building Contractor Exam — All Questions
AllProcurement & Contracting RequirementsGeneral RequirementsSite ConstructionConcreteMetalsMechanical & PlumbingWood, Plastics & CompositesThermal & Moisture ProtectionFinishesMasonryOpenings (Doors, Windows & Glazing)Electrical
1 questions
Electrical
On a construction site, what is the primary purpose of ground-fault circuit-interrupter (GFCI) protection on temporary power?
- a.To quickly interrupt the circuit when it senses a ground fault, protecting workers from electric shock✓
- b.To prevent overloading the generator
- c.To increase the voltage delivered to tools
- d.To reduce the amperage drawn by motors
A GFCI monitors the current going out and returning; if it detects an imbalance (a ground fault, such as current flowing through a person), it trips quickly to prevent electrocution. OSHA requires GFCI protection (or an assured equipment grounding conductor program) for temporary construction power.GFCI protection (NEC / OSHA 1926.404)