Question 1
You are sizing service conductors for a small commercial building. After calculating loads, demand factors, and continuous load adjustments, the calculated demand load is 140 A. Which standard service size is most appropriate?
Question 2
A dwelling unit has a calculated general load of 10 kW at 120/240 V, plus a 6 kW range and a 5 kW electric dryer. When applying typical Canadian demand factors, which statement BEST describes the impact on service size selection?
Question 3
In a load calculation for a small commercial occupancy, which principle is commonly applied when combining lighting and receptacle loads?
Question 4
A feeder supplies a subpanel that serves mainly lighting and receptacle loads. When planning the installation, what is a key step in determining the feeder ampacity?
Question 5
A dwelling has a 120/240 V, 200 A service. The calculated general lighting and receptacle load after applying demand factors is 10 kVA. There is a 12 kW range and a 5 kW electric dryer, both at 240 V. Ignoring other loads, what is the approximate total calculated load in amperes at 240 V for service sizing?
Question 6
A feeder calculation for a small commercial panel must consider demand factors for various loads. Which load type often qualifies for demand factors that reduce the calculated load in US practice?
Question 7
In a multifamily building, a Master electrician is sizing the main service. Which approach best reflects proper practice?
Question 8
A commercial kitchen has several large loads, including dishwashers and refrigerators. The journeyperson is calculating feeder size and must consider the possibility that not all loads run simultaneously. Which concept is MOST relevant here?
Question 9
A journeyperson calculates a total load of $5000 \text{ VA}$ for lighting and general-purpose receptacles in a dwelling unit. According to the NEC standard method, what is the demand load applied to this portion of the service calculation?
Question 10
According to NEC Article 210, a fixed electric space-heating load shall be calculated at what percentage of the total connected load in a dwelling unit?
Question 11
A commercial kitchen has three $30 \text{ A}$ fixed electric cooking appliances. According to NEC Table $220.55$, what is the calculated demand load for these appliances?
Question 12
A feeder conductor is rated 125 A according to the ampacity table, and it supplies a continuous load of 100 A plus a noncontinuous load of 20 A. Based on typical NEC calculation practice, is the conductor adequately sized?
Question 13
During a service upgrade, you must coordinate the utility transformer size with the building load. Which document or calculation do you rely on first?
Question 14
A feeder calculation for a mixed-use building shows several continuous and noncontinuous loads. Which method best reflects proper load calculation practice?
Question 15
You are planning a new service for a small commercial building. The calculated demand load is close to the existing 200 A service rating, and future expansion is expected. What is the BEST design approach?