Row 2: Calculated load in amperes divided by voltage factor. Row 3: Row 4: Row 5: Load type: C = continuous; N = noncontinuous; M = motor; R = receptacle. Load modifier, 1.25 for C and M load types, 1.0 for R and N load types. Calculated load amperes (Row 2) multiplied by load modifier (Row 4). 67115 ch04_pip01_085-00998 Row 6: OCPD rating is equal to or next higher standard ampere rating than OCPD selection amperes (Row 5). Row 7: Ampacity of conductor equal to or greater than the calculated load amperes (Row 2). Row 8: Conductor size with ampacity equal to or greater than calculated load amperes (Row 2). Select from Table 310.16 using the appropriate 60°C for circuits rated 100 amperes or less, and the 75°C column for loads over 100 amperes. Row 9: From problem statements. Row 10: From NEC Table 310.15(B)(1)(1). Row 11: From load calculation. Row 12: From problem statements. Row 13: From NEC Table 310.15(C)(1). Row 14: From NEC 310.16 for conductor type specified in the problem statement: (THHN/THWN). Row 15: Value from Row 13 multiplied by correction and/or adjustment factors. This value must be equal to or greater than the minimum conductor ampacity value in Row 7. 230303 4:07 PM Complete the following table using the following circuits: 1. Eleven 120-volt duplex receptacles for general use. Receptacle loads are considered to be noncontinuous and are not subject to the 80% load limitation as applied for contin- uous loads. 2. Ten 120-volt fluorescent luminaires, rated at 150 volt-amperes each. 3. Eight 120-volt incandescent luminaires, rated at 200 watts or VA each. 4. One 240-volt exhaust fan, rated at 5000 watts or VA. 5. One 120/240-volt single-phase, 3-wire feeder, 40-kVA continuous load, originating in a room with an ambient temperature of 100°F (38°C). ROW CIRCUIT NUMBER 1 Calculated Load in Volt-Amperes Calculated Load in Amperes 2 3 Load Type 4 Load Modifier 5 OCPD Selection Amperes 6 OCPD Ampere Rating 7 8 9 10 Minimum Conductor Ampacity Minimum Conductor Size Type THHN/THWN Ambient Temperature Temperature Correction Factor 11 Number of Branch Circuits Required 12 Number of Current-Carrying Conductors 13 Raceway Fill Adjustment Factor 14 15 Conductor Ampacity Before Correcting/Adjusting Conductor Ampacity After Correcting/Adjusting 1 2 4 5 Factors: • Circuits 1, 2, 3, and 4 are installed in the same raceway for a distance of 10 ft in an environment where the maximum ambient temperature will be 86°F (30°C). ⚫ Type THHN/THWN conductors shall be used for all circuits. • Minimum conductor size 12 AWG. Row 1: Calculated load in volt-amperes from problem statements. Row 2: Calculated load in amperes divided by voltage factor.

Row 2: Calculated load in amperes divided by voltage factor. Row 3: Row 4: Row 5: Load type: C = continuous; N = noncontinuous; M = motor; R = receptacle. Load modifier, 1.25 for C and M load types, 1.0 for R and N load types. Calculated load amperes (Row 2) multiplied by load modifier (Row 4). 67115 ch04_pip01_085-00998 Row 6: OCPD rating is equal to or next higher standard ampere rating than OCPD selection amperes (Row 5). Row 7: Ampacity of conductor equal to or greater than the calculated load amperes (Row 2). Row 8: Conductor size with ampacity equal to or greater than calculated load amperes (Row 2). Select from Table 310.16 using the appropriate 60°C for circuits rated 100 amperes or less, and the 75°C column for loads over 100 amperes. Row 9: From problem statements. Row 10: From NEC Table 310.15(B)(1)(1). Row 11: From load calculation. Row 12: From problem statements. Row 13: From NEC Table 310.15(C)(1). Row 14: From NEC 310.16 for conductor type specified in the problem statement: (THHN/THWN). Row 15: Value from Row 13 multiplied by correction and/or adjustment factors. This value must be equal to or greater than the minimum conductor ampacity value in Row 7. 230303 4:07 PM Complete the following table using the following circuits: 1. Eleven 120-volt duplex receptacles for general use. Receptacle loads are considered to be noncontinuous and are not subject to the 80% load limitation as applied for contin- uous loads. 2. Ten 120-volt fluorescent luminaires, rated at 150 volt-amperes each. 3. Eight 120-volt incandescent luminaires, rated at 200 watts or VA each. 4. One 240-volt exhaust fan, rated at 5000 watts or VA. 5. One 120/240-volt single-phase, 3-wire feeder, 40-kVA continuous load, originating in a room with an ambient temperature of 100°F (38°C). ROW CIRCUIT NUMBER 1 Calculated Load in Volt-Amperes Calculated Load in Amperes 2 3 Load Type 4 Load Modifier 5 OCPD Selection Amperes 6 OCPD Ampere Rating 7 8 9 10 Minimum Conductor Ampacity Minimum Conductor Size Type THHN/THWN Ambient Temperature Temperature Correction Factor 11 Number of Branch Circuits Required 12 Number of Current-Carrying Conductors 13 Raceway Fill Adjustment Factor 14 15 Conductor Ampacity Before Correcting/Adjusting Conductor Ampacity After Correcting/Adjusting 1 2 4 5 Factors: • Circuits 1, 2, 3, and 4 are installed in the same raceway for a distance of 10 ft in an environment where the maximum ambient temperature will be 86°F (30°C). ⚫ Type THHN/THWN conductors shall be used for all circuits. • Minimum conductor size 12 AWG. Row 1: Calculated load in volt-amperes from problem statements. Row 2: Calculated load in amperes divided by voltage factor.

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter3: Determining The Required Number Of Branch Circuits, Lighting Outlets, And Receptacle Outlets

Section: Chapter Questions

Problem 12R: How many lighting branch circuits are provided in this dwelling? __________ a. What is the minimum...

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