Question 61
What is the primary purpose of a ground-fault circuit interrupter (GFCI) in residential wiring?
Question 62
What is the primary purpose of an arc-fault circuit interrupter (AFCI) in a dwelling unit?
Question 63
In a residential service, what is the primary purpose of the main bonding jumper between the grounded (neutral) conductor and the equipment grounding conductors at the service disconnect?
Question 64
A driven ground rod is installed for a residential service, and its resistance to earth tests higher than acceptable. What is a common corrective action?
Question 65
When setting up an extension ladder against a wall, which general rule best describes a safe angle?
Question 66
What is the primary purpose of a ground-fault circuit interrupter (GFCI) receptacle?
Question 67
Why is it important to label each circuit in a residential panelboard directory?
Question 68
What is the primary function of a GFCI receptacle in a bathroom circuit?
Question 69
Which best describes an arc-fault circuit interrupter (AFCI) used in dwelling units?
Question 70
What is the main purpose of a ground-fault circuit interrupter (GFCI) receptacle in a bathroom?
Question 71
What is the main purpose of an arc-fault circuit interrupter (AFCI)?
Question 72
An extension cord used on a job site is found to have a damaged outer jacket exposing the conductors. What should the electrician do?
Question 73
What is the primary purpose of an equipment grounding conductor (EGC) in a branch circuit?
Question 74
Which statement best describes the function of the equipment grounding conductor?
Question 75
What is the primary purpose of the equipment grounding conductor in a branch circuit?
Question 76
In a commercial office, multiple circuits share a metal junction box. What must be done with the equipment grounding conductors?
Question 77
Which statement best describes the purpose of the equipment grounding conductor in a branch circuit?
Question 78
What is the main purpose of an AFCI device in dwelling unit circuits?
Question 79
A large open office uses a dimming system with 0–10 V control wiring to LED drivers. Several fixtures remain at full brightness even when the dimming control indicates low output. What is the most probable electrical cause?
Question 80
What is the purpose of the equipment grounding conductor in a branch circuit?
Question 81
Which of the following BEST describes a GFCI device in a 120 V branch circuit?
Question 82
What is a likely result of using an undersized conductor for a continuous load on a branch circuit?
Question 83
What is the primary purpose of an equipment grounding conductor in a branch circuit?
Question 84
An outdoor GFCI receptacle used for a spa is frequently tripping. The spa pump and heater are on the same circuit. Which is the most appropriate first step in troubleshooting?
Question 85
Which type of protection system is primarily intended to protect personnel from fatal electric shock by interrupting the circuit when a current imbalance (leakage) to ground is detected?
Question 86
Which safety term describes a permanent short circuit between an ungrounded conductor and a metallic equipment enclosure or raceway?
Question 87
Which of the following describes a key safety feature of a $120\text{ V}$ three-wire cord on a power tool?
Question 88
When installing a metal device box in a metal stud wall, how should the equipment grounding conductor be handled?
Question 89
When laying out conduit runs from a panel to several branch circuits, why is a one-line diagram helpful?
Question 90
An extension ladder is set up to access a roof that is 16 ft above the ground. Approximately how far should the base of the ladder be from the wall to follow the 4-to-1 rule?