184 Modern Commercial Wiring Copyright Goodheart-Willcox Co., Inc. Copyright Goodheart-Willcox Co., Inc. Review Questions Answer the following questions using the informa- tion provided in this chapter. 1. What type of conductor extends beyond the fi nal overcurrent device? fi 2. What type of conductor originates at the main disconnect device and terminates at panelboards and load centers? 3. How is the rating of a branch circuit determined? 4. What is the smallest conductor permitted for use in a branch circuit? 5. Define fi continuous load. 6. What are the fi ve general types of branch- fi circuit loads? 7. If the exact number of receptacles is unknown, how can the receptacle load be calculated? 8. How is the show-window lighting load determined? 9. How many receptacles must be installed for the nondwelling receptacle loads derating to reduce the total receptacle load? 10. A large hotel has 2500 ft2 of hallway space. Assuming continuous load, how many volt-amperes should be allowed for this load for service computation? 11. Calculate the general lighting load for a commercial warehouse having an area of 90,000 ft2. Assume continuous duty. 12. What is the demand factor used for four kitchen equipment loads in a commercial cafeteria? 13. Compute the receptacle load for a retail store having 165 duplex receptacles. 14. A furniture store has 60 linear feet of show window. Calculate this continuous load. 15. What is the minimum outside sign lighting load required by the Code? 16. What is the general lighting load for a 50-room motel where each room is 12′ × 20′? × 17. A 24-hour service restaurant has 75 duplex receptacles. Calculate the total load for feeder calculations. 18. What is the service demand for a small bank measuring 2500 ft2 and supplied with 208/120-volt, three-phase service? Assume lighting as continuous. The bank has the following loads: 15 kW heating (208-volt) 7.5 hp air conditioning 50 linear feet of show window 25 duplex receptacles. 19. A new high school is to be supplied with 208/120-volt power. Calculate the total feeder conductor and feeder neutral loads. Assume all lighting loads are continuous. 30,000 ft2 classroom space 6000 ft2 auditorium 5000 ft2 cafeteria (use restaurant load) 10 kW outside lighting (120-volt) 225 duplex receptacles (120-volt) Kitchen equipment: (2) 15 kW ovens (208-volt) (2) 10 kW ranges (208-volt) (4) 4 kW fryers (208-volt) (1) 10 kW water heater (208-volt) (1) 3 kW dishwasher (208-volt) (2) 2.5 kW toasters (208-volt) (1) 1/2 hp vent fan (120-volt) (1) 3/4 hp blower motor (120-volt) Heating: 40 kW electric heat (208-volt) Know the Code Refer to the National Electrical Code to answer the following questions. 1. In addition to Article 210, which other section contains information on branch circuits supplying pipe organs? 2. What is the minimum branch-circuit current rating for cooking ranges with ratings of 8 3/4 kW or higher? 3. How near to the appliance does a dedicated appliance receptacle need to be installed? 4. How is the size for a feeder overcurrent protective device determined? 5. Article 220 addresses branch-circuit, feeder, and service calculations. How are fractions of amperes handled in calculations? 6. Show-window loads can be computed in two ways. Name the ways.