Question 1
A feeder supplies a calculated continuous load of 80 A at 240 V. According to typical Canadian practice, what is the MINIMUM ampere rating of the feeder overcurrent device if the load is 100% continuous?
Question 2
When calculating load for a commercial panel, why are continuous loads often multiplied by 125 percent when sizing conductors and overcurrent devices?
Question 3
A fluorescent lighting circuit in a commercial hallway keeps blowing its breaker shortly after being turned on. Several new fixtures were recently added. Which is the most likely cause?
Question 4
An apprentice is sizing conductors for a feeder. The ambient temperature in the mechanical room is higher than usual. What effect does this have on ampacity?
Question 5
During an inspection, you find that a feeder neutral conductor is smaller than the phase conductors. Under what condition can this be acceptable?
Question 6
Which statement best describes conductors installed in a wet location, such as an underground conduit?
Question 7
What is the minimum ampacity rating required for conductors supplying a capacitor bank per CEC Section 26?
Question 8
Which factor must be considered when grouping more than 3 current-carrying conductors in a raceway?
Question 9
Which CEC table is used to determine the ampacity of copper conductors in a raceway?
Question 10
When installing a capacitor bank, the conductors must be rated for at least what percentage of the capacitor's rated current?
Question 11
Which CEC table is used to find the maximum ampacity of copper conductors in a raceway?
Question 12
Which conductor insulation type is specifically rated for use in wet locations?
Question 13
CEC Section 4 principles dictate that if more than three current-carrying conductors are installed in a single raceway, their ampacity must be adjusted. What is the adjustment factor for 4 to 6 current-carrying conductors?
Question 14
You are asked to verify that feeder conductors meet temperature rating limits at terminations. What must be checked against the Canadian Electrical Code?
Question 15
In a typical Canadian dwelling unit, what is the usual nominal voltage for general-purpose receptacles?
Question 16
When working in a damp location outdoors, which type of receptacle and cover combination is typically required for general-purpose outlets?
Question 17
Which factor will reduce the ampacity of conductors according to common code principles?
Question 18
A conduit run contains three current-carrying #10 AWG copper conductors in an ambient temperature of 30 °C. Which factor primarily determines the ampacity of these conductors?
Question 19
A feeder is required to carry 40 A using copper conductors under typical installation conditions. Which minimum conductor size is usually selected, assuming standard temperature ratings and no derating?
Question 20
A bundle of loaded current-carrying conductors is installed in a raceway passing through a hot mechanical room. According to typical Canadian code principles, what must the electrician consider when selecting conductor ampacity?
Question 21
Which conductor color is typically used for equipment grounding conductors in branch circuits in the US?
Question 22
You must select a raceway size for multiple feeders routed together to a rooftop mechanical room. Which information is most critical to determine the correct raceway size?
Question 23
Which NEC table is used to find the ampacity of insulated conductors rated 0-2000V?
Question 24
When determining the ampacity of conductors, what adjustment must be applied if more than three current-carrying conductors are bundled in a raceway longer than 24 inches?