8:33Refer to the National Electrical Code or the working drawings when necessary.Where applicable, responses should be written in complete sentences.Complete the following table using the following circuits:1. Eleven 120-volt duplex receptacles for general use. Receptacle loads are consideredto be noncontinuous and are not subject to the 80% load limitation as applied for con-tinuous loads,2. Ten 120-volt fluorescent luminaires, rated at 150 volt-amperes each.3. Eight 120-volt incandescent luminaires, rated at 200 watts each.4. One 240-volt exhaust fan, rated at 5000 watts.5. One 120/240-volt single-phase, 3-wire feeder, 40-kVA continuous load, originating ina room with an ambient temperature of 100°F (38°C).RowCircuit Number13.1Calculated Load in Volt-AmperesCalculated-Load in Amperes3Load Type4Load Modifier5OCPD Selection Amperes6OCPD Ampere Rating7.Minimum Conductor Ampacity8.Minimum Conductor Size Type THHN/THWN9.Ambient Temperature10Temperature Correction Factor11 Number of Branch Circuits RequiredNumber of Current-Carrying ConductorsRaceway Fill Adjustment FactorConductor Ampacity Before Correcting/ Adjusting12131415Conductor Ampacity After Correcting/ AdjustingFactors:• Circuits 1, 2, 3, and 4 are installed in the same raceway for a distance of 10 ft in an environment where themaximum 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 3:Load type: C = continuous; N = noncontinuous; M = motor; R = receptacle. 8:311 Searchul : O88CHAPTER 4 Branch CircuitsRow 4: Load modifier, 1.25 for C and M load types, 1.0 for R and N load types.Row 5: Calculated load amperes (Row 2) multiplied by load modifier (Row 4).Row 6: OCPD rating equal to or next higher standard ampere rating than OCPD selection amperes(Row 5).Row 7: Ampacity of conductor equal to or greater than calculated load amperes (Row 2).Row 8: Conductor size with ampacity equal to or greater than calculated load amperes (Row 2). Selectfrom Table 310.16 using the appropriate 60°C for circuits rated 100 amperes or less, and the75°C column for loads over 100 amperes.Row 9: From problem statements.Row 10: From NEC Table 310.15(B)(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 problem statement: (THHN/THWN).Row 15: Value from Row 13 multiplied by correction and/or adjustment factors. This value must beequal to or greater than the minimum conductor ampacity value in Row 7.

Refer to the National Electrical Code or the working drawings when necessary. Where applicable, responses should be written in complete sentences. 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 con- tinuous loads.

Refer to the National Electrical Code or the working drawings when necessary. Where applicable, responses should be written in complete sentences. 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 con- tinuous loads.

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter28: Overcurrent Protection–fuses And Circuit Breakers

Section: Chapter Questions

Problem 3R

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