Load Calculations - Branch and Feeder Circuits (Chapter 1) Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

Load Calculations - Branch and Feeder Circuits (Chapter 1) Questions and Answers | Latest Version | 2024/2025 | Correct & Verified What is the primary purpose of a branch circuit in an electrical system? A. To distribute electrical power to individual loads or outlets What is the role of a feeder circuit in an electrical distribution system? A. To carry electrical power from the service panel to branch circuits How do you calculate the total load on a branch circuit? A. By summing the wattage of all connected devices or appliances What is the formula for calculating the amperage of a circuit? A. Amperage = Wattage ÷ Voltage How do you determine the required wire size for a feeder circuit? A. By considering the current, distance, and voltage drop 2 What should be considered when calculating the load for a branch circuit? A. The total wattage of all devices connected to the circuit What is the recommended maximum load for a 15-amp branch circuit? A. 1,800 watts Why is it important to account for voltage drop when calculating load for long feeder circuits? A. To ensure efficient operation and prevent equipment damage How do you calculate the total load for multiple branch circuits connected to a single feeder? A. By summing the individual load calculations for each branch circuit What is the purpose of overcurrent protection in a branch circuit? A. To prevent the circuit from overheating or causing a fire What factors influence the ampacity of a conductor in a branch circuit? A. Conductor material, insulation type, and ambient temperature 3 How do you calculate the load on a 240-volt circuit? A. By dividing the total wattage by 240 volts What is the purpose of a panelboard in the distribution of electricity? A. To house the circuit breakers and distribute electrical power to branch circuits What is the recommended load factor when calculating load for circuits with intermittent or non- continuous use? A. 75% of the rated capacity What is the maximum allowable load for a 20-amp branch circuit? A. 2,400 watts How do you calculate the maximum allowable load on a feeder circuit? A. By considering the feeder’s ampacity and the total load it will carry What is the importance of considering the diversity factor in load calculations? 4 A. To account for the fact that not all devices will be used at full load simultaneously How do you calculate the total connected load for a commercial building? A. By summing the wattage of all devices and equipment that will be connected Why is it important to use the correct voltage rating when calculating load for a branch or feeder circuit? A. To prevent overloading and ensure compatibility with the electrical system What is the purpose of a circuit breaker in a branch circuit? A. To protect the circuit from overloads and short circuits How do you calculate the total load for a multi-phase feeder circuit? A. By summing the individual loads for each phase and considering the phase imbalance What is the role of the NEC (National Electrical Code) in load calculations? A. To provide standards and guidelines