Question 61
You are called to investigate a nuisance tripping on a 20 A kitchen small-appliance branch circuit. Two countertop receptacles serve a toaster oven (12 A) and a kettle (12 A). What is the most likely cause?
Question 62
A 20 A, 120 V branch circuit in a dwelling unit serves general receptacles. What is the maximum continuous load that should normally be connected to this circuit?
Question 63
A journeyperson asks you to calculate the total current drawn by three 600 W, 120 V heaters connected on the same 120 V branch circuit. What is the total current?
Question 64
A motor nameplate shows 7.5 kW at 600 V, three-phase, with a full-load current of 9 A. What is the best way to size the branch-circuit overcurrent device?
Question 65
Before working on a 120 V branch circuit in a dwelling unit, what is the first safety step an apprentice electrician should take?
Question 66
Which statement best describes the purpose of the equipment bonding conductor in a branch circuit?
Question 67
A 120 V, 15 A branch circuit has a continuous load of 12 A. How does this relate to typical code guidance on loading of overcurrent devices?
Question 68
A Level 4 apprentice is reviewing a panel schedule and sees that several neutrals are shared among circuits in a multiwire branch circuit. What is a critical requirement for the breakers of those circuits?
Question 69
In a parallel circuit, how does the voltage across each branch compare to the supply voltage?
Question 70
What is the main purpose of a junction box in a branch circuit?
Question 71
A 15 A, 120 V general-purpose branch circuit in a dwelling is typically wired with which minimum conductor size in copper?
Question 72
When installing receptacles in a Canadian dwelling unit kitchen, what is one key code consideration for the counter receptacle circuits?
Question 73
Which protective device is most appropriate for protecting a motor branch circuit against short-circuit and ground-fault conditions?
Question 74
In a typical Canadian residential branch circuit using copper conductors, which colour is normally used for the ungrounded (hot) conductor?
Question 75
What is the main function of the bonding (grounding) conductor in a branch circuit?
Question 76
For a 15 A general-purpose branch circuit in a Canadian dwelling using copper conductors, which minimum conductor size is typically used?
Question 77
A continuous load on a branch circuit is calculated to be 16 A. What is the minimum standard circuit breaker rating that should typically be selected?
Question 78
A multi-wire branch circuit shares a neutral between two ungrounded conductors on different phases. What requirement applies to the disconnecting means?
Question 79
Before energizing a newly installed branch circuit, the electrician performs a continuity test between the bonding conductor and the metal boxes. Why is this test important?
Question 80
A 15 A general-purpose branch circuit is supplying a continuous load. According to typical design practice, what is the maximum continuous load that should be placed on this circuit?
Question 81
A 15 A, 120 V general-use branch circuit in a dwelling is most commonly wired with which copper conductor size?
Question 82
Which type of receptacle should be installed in a residential bathroom to help protect people from electric shock?
Question 83
What is the nominal voltage for general-purpose receptacle circuits in a typical US dwelling?
Question 84
Which device is specifically designed to protect against arc-faults in branch circuits, especially in dwelling unit bedrooms and similar areas?
Question 85
What is the minimum copper conductor size typically used for a 20 A residential branch circuit in the US?
Question 86
A 15 A general-purpose branch circuit in a dwelling unit is most commonly wired with which copper conductor size?
Question 87
A 20 A, 120 V branch circuit has a continuous load of 12 A and a noncontinuous load of 6 A. Is this acceptable on the circuit?
Question 88
A 120 V, 20 A branch circuit supplies a continuous lighting load only. What is the maximum continuous load in amperes that should be connected?
Question 89
What is the minimum copper conductor size typically permitted for a 15 A general-purpose lighting and receptacle branch circuit in a US dwelling?
Question 90
In a bedroom branch circuit of a modern US dwelling, what type of protection is commonly required at the origin of the circuit?