Question 121
A bathroom remodel adds a large whirlpool tub and a high-wattage hair dryer receptacle. What is the most appropriate approach regarding branch circuits for these loads?
Question 122
Which condition is an indication that a receptacle outlet may be overloaded?
Question 123
A 20 A, 120 V branch circuit feeds four identical receptacles. Each receptacle serves a 4 A continuous load. What is the total connected load and is it within the circuit rating for continuous loading?
Question 124
A panelboard in a small commercial space has multiple multiwire branch circuits. What must be ensured about the breakers for each multiwire branch circuit?
Question 125
A 20 A, 120 V general-purpose branch circuit using copper conductors is being installed. Which minimum conductor size is typically required?
Question 126
A multiwire branch circuit (MWBC) shares a neutral between two hot legs. What must be done with the breakers serving the two hot conductors?
Question 127
You are installing a 120 V, 20 A small-appliance branch circuit in a kitchen. Which of the following receptacles is most appropriate to install on that circuit at the counter?
Question 128
Which device is typically used to protect a branch circuit from overcurrent in a residential panelboard?
Question 129
A 15 A, 120 V branch circuit is most commonly wired with which minimum copper conductor size in a typical US dwelling?
Question 130
You are installing a 20 A, 120 V small-appliance branch circuit in a US kitchen. Which receptacle rating is appropriate for this circuit?
Question 131
A multi-wire branch circuit supplies two small-appliance circuits in a kitchen. The shared neutral is loose in a junction box. What condition could this create at the receptacles?
Question 132
In a US residential bathroom, which type of receptacle is generally required near the sink for personnel protection?
Question 133
In a typical US dwelling, bedroom receptacle circuits commonly require which type of protection under current codes?
Question 134
Which kitchen appliance in a typical US dwelling is most likely to require a dedicated branch circuit under current codes?
Question 135
Where is a ground-fault circuit interrupter (GFCI) MOST commonly required in a dwelling unit?
Question 136
What is the purpose of the 'TEST' button on a GFCI receptacle?
Question 137
Several kitchen counter receptacles have lost power, but the breaker in the panel is not tripped. What should the apprentice check FIRST?
Question 138
A 120 V, 20 A general-purpose branch circuit in a dwelling will be wired with copper conductors. Which conductor size is MOST commonly used, assuming typical conditions and code requirements?
Question 139
Arc-fault circuit interrupter (AFCI) protection is primarily intended to reduce the risk of which hazard in dwelling unit branch circuits?
Question 140
In a dwelling, a multiwire branch circuit feeds two small-appliance circuits in the kitchen. Several receptacles on one leg show unusually high voltage while others on the opposite leg show low voltage when measured to neutral. What is the MOST likely problem?
Question 141
A dwelling small-appliance branch circuit is 120 V and protected by a 20 A breaker. If it is loaded to 80% of its rating, what is the load current?
Question 142
You are troubleshooting a kitchen receptacle that has no power. The breaker is on and tests good, and other receptacles on the circuit still work. What is the most likely next thing to check?
Question 143
Which residential areas most commonly require AFCI protection under modern US codes?
Question 144
A bathroom GFCI receptacle trips intermittently when a hair dryer is used on a different circuit that shares the neutral. What is the most likely cause?
Question 145
Which branch-circuit rating is commonly used for general-purpose receptacles in a dwelling unit in the US?
Question 146
What is the primary purpose of a ground-fault circuit interrupter (GFCI) receptacle in a bathroom?
Question 147
For a typical 120 V, 15 A dwelling bedroom circuit in the US, which overcurrent device is commonly required by current standards?
Question 148
A dwelling unit kitchen requires small-appliance branch circuits. Which statement best reflects common US code requirements?
Question 149
A 20 A, 120 V branch circuit serves a continuous lighting load in a commercial space. Based on common US code practice, what is the maximum continuous load that should be planned on this circuit?
Question 150
Which location is most likely to require GFCI protection in a dwelling unit?