Question 1
Lighting on a long corridor circuit appears dimmer at the far end compared to near the panel. Which action is most appropriate to reduce voltage drop?
Question 2
A 30 m run of #12 Cu conductors supplies a 20 A load at 120 V. The client complains of slightly dim lights when the load is high. Which measure is MOST effective at reducing voltage drop on this circuit?
Question 3
A 20 A, 120 V circuit feeds a load 30 m away. The voltage drop is found to be close to the recommended maximum. Which action is MOST effective to reduce the voltage drop while keeping the same load and distance?
Question 4
A long 120 V branch circuit to an outbuilding experiences noticeable voltage drop under load. What is the most appropriate corrective action to reduce voltage drop?
Question 5
A 50 m run of copper feeder must be installed to supply a 100 A, 120/208 V three-phase panel. To limit voltage drop to approximately 3%, which design consideration is most appropriate?
Question 6
You are asked to verify that a feeder conductor size is adequate for both ampacity and voltage drop. Which steps are most appropriate?
Question 7
A 50 m run of copper conductor supplies a 20 A load at 120 V. The voltage drop is higher than acceptable. What is the most practical corrective action?
Question 8
A commercial kitchen has multiple large motors and heating loads. The voltage at the far end of a long feeder drops significantly during peak operation. What design change most directly reduces voltage drop?
Question 9
What happens to the voltage available at a load when the length of a properly sized conductor run is increased significantly?
Question 10
A 120 V, 15 A branch circuit supplies a receptacle 30 m away using #14 AWG copper conductors. The circuit is lightly loaded at 8 A. Which statement best describes the expected voltage at the receptacle?
Question 11
A 30 m run of copper conductor has a total resistance of 0.25 Ω. If a load draws 12 A, what is the approximate voltage drop on the conductors?
Question 12
A long 120 V branch circuit supplying receptacles in a corridor is found to have excessive voltage drop under load. Which corrective action is most appropriate?
Question 13
What is the maximum allowable voltage drop in a feeder conductor according to CEC Section 8?
Question 14
Calculate the percent voltage drop on a 240V circuit if the voltage at the load is 232V.
Question 15
A 20A branch circuit using #12 AWG copper wire is 45 meters long. If the load is 16A and voltage is 120V, what is the approximate voltage drop? (Assume R = 5.3 ohms/km for #12)
Question 16
According to CEC concepts, what is the maximum allowed voltage drop for a branch circuit and feeder combined, from the point of service to the furthest outlet?
Question 17
According to CEC concepts, what is the maximum recommended voltage drop for a branch circuit and feeder combined, from the service point to the furthest outlet?
Question 18
A 120V circuit has a measured voltage of 114V at the furthest outlet under full load. What is the percentage voltage drop for this circuit?
Question 19
A 30 m run of copper conductor supplies a 20 A load at 120 V. If voltage drop is a concern, which design choice is MOST appropriate?
Question 20
A feeder calculation for a small commercial building shows a demand load of 150 A at 120/208 V three-phase. Which of the following conductor selections BEST reflects good practice if the code requires ampacity not less than the calculated load and voltage drop must be kept low?
Question 21
A 50 m run of copper conductor supplies a 20 A load at 240 V. If voltage drop is becoming an issue, which strategy is most effective?
Question 22
A feeder in a commercial building is heavily loaded and runs a considerable distance. Which issue is most likely if the conductor size is too small for the run length?
Question 23
A 45 m run of 12 AWG copper is feeding a continuous 16 A load at 120 V. Voltage measurements at the load show a noticeable drop under load. Which is the most appropriate corrective measure?
Question 24
A 30 m run of copper conductor has too much voltage drop for a sensitive load. Which action is most effective in reducing voltage drop?
Question 25
On a large commercial project, voltage drop calculations show that a feeder run will have excessive drop at full load. The design currently uses copper conductors in conduit. Which combination of changes is the most effective solution?
Question 26
When laying out receptacle circuits in a commercial office, what is a key consideration to maintain good voltage regulation and code compliance?
Question 27
For a feeder run of significant length, what practice helps limit voltage drop to acceptable levels?
Question 28
A Level 3 apprentice calculates that a feeder has a significant voltage drop over a long run. Which adjustment can help reduce voltage drop?
Question 29
A 10 hp, 460 V three-phase motor will be installed 200 ft away from the panel. To minimize voltage drop and ensure proper operation, what general action is most appropriate?
Question 30
An equipment grounding conductor run with a feeder is accidentally undersized. Which hazard does this most directly create?