NASCLA Commercial General Building Contractor Exam — All Questions
Alltopics.nascla_procurement_contractingtopics.nascla_general_requirementstopics.nascla_site_constructiontopics.nascla_concretetopics.nascla_metalstopics.nascla_mechanical_plumbingtopics.nascla_woodtopics.nascla_thermal_moisturetopics.nascla_finishestopics.nascla_masonrytopics.nascla_doors_windows_glazingtopics.nascla_electrical
1 questions
topics.nascla_electrical
On a construction site, what is the primary purpose of ground-fault circuit-interrupter (GFCI) protection on temporary power?
- a.To increase the voltage delivered to tools
- b.To prevent overloading the generator
- c.To reduce the amperage drawn by motors
- d.To quickly interrupt the circuit when it senses a ground fault, protecting workers from electric shock✓
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)