Question 91
An outdoor 120 V receptacle on a dwelling is being replaced. Which combination is typically required by code?
Question 92
Which location most clearly requires GFCI protection in a typical US dwelling?
Question 93
Which American Wire Gauge (AWG) size is typically used for a 20 A, 120 V branch circuit with copper conductors?
Question 94
In a US dwelling kitchen, which type of branch circuit is commonly required for countertop receptacle outlets?
Question 95
Which of the following best describes a branch circuit?
Question 96
A 20 ampere, 120 volt branch circuit in a dwelling supplies only small appliance receptacles in a kitchen. Which conductor size is typically required for copper conductors?
Question 97
On a set of drawings, the symbol for a duplex receptacle appears with a slash through it and the note 'half switched'. What does this indicate?
Question 98
A receptacle circuit frequently trips its 15 ampere breaker when a space heater and vacuum cleaner operate together. What is the best corrective action?
Question 99
You are wiring a residential air conditioning condenser that requires a dedicated 240 V circuit. Which is the most appropriate type of circuit for this load?
Question 100
In a typical US dwelling unit, which location requires GFCI protection for receptacles?
Question 101
In a typical US dwelling, what is the maximum standard circuit breaker rating used for a general lighting branch circuit wired with 12 AWG copper conductors?
Question 102
In a typical US dwelling kitchen, why are at least two 20 A small-appliance branch circuits required to serve countertop receptacles?
Question 103
A bedroom in a new dwelling unit has receptacles that are required to be both AFCI and GFCI protected. Which device choice can satisfy both requirements with the least wiring complexity at the first outlet?
Question 104
On a commercial electrical drawing, several receptacles are labeled with the same circuit number but are located in different rooms. What does this typically indicate?
Question 105
On a 120/240 V multiwire branch circuit serving two small-appliance circuits, what is the primary hazard if the shared neutral is disconnected while both ungrounded conductors remain energized and supplying 120 V loads?
Question 106
A contractor installs a single 20 A, 120 V branch circuit to supply receptacles in two bathrooms of a dwelling. No other loads are connected to this circuit. Under typical US code rules, is this arrangement generally acceptable and why?
Question 107
On a multiwire branch circuit feeding two small-appliance circuits, an installer replaced the first two receptacles with individual GFCI receptacles but left the shared neutral. Afterward, both GFCIs trip as soon as loads are connected. What is the most likely cause?
Question 108
A 120-volt receptacle in a residential bathroom in the US must have which type of protection?
Question 109
A standard duplex receptacle symbol on a residential plan usually indicates what?
Question 110
A 15-amp general lighting branch circuit in a dwelling using copper conductors typically uses which minimum conductor size?
Question 111
A 20-amp, 120-volt branch circuit in a dwelling must be wired with at least what size copper conductor?
Question 112
Which condition is most likely to cause nuisance tripping of a GFCI receptacle?
Question 113
Which conductor size is commonly used for a 20 A, 120 V copper branch circuit in a dwelling?
Question 114
A kitchen small-appliance branch circuit is repeatedly tripping when multiple countertop appliances are used. Which is the most appropriate first step?
Question 115
A 16 A continuous load is planned on a 120 V branch circuit. What is the minimum standard branch-circuit rating that should be used?
Question 116
A receptacle in a garage no longer has power. The breaker is not tripped and other receptacles on the circuit work. What is the most likely first troubleshooting step?
Question 117
Which device provides both overcurrent and short-circuit protection for a branch circuit?
Question 118
A 15 A general-purpose branch circuit in a dwelling is normally wired with which minimum copper conductor size?
Question 119
A 15 A residential lighting circuit is being wired. What is the typical conductor size used for this general-purpose branch circuit in copper?
Question 120
A bathroom receptacle is dead, but the breaker is on. Several outdoor receptacles are also dead. What should the electrician check FIRST?