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.
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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,
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 in
a room with an ambient temperature of 100°F (38°C).
Row
Circuit Number
1
3.
1
Calculated Load in Volt-Amperes
Calculated-Load in Amperes
3
Load Type
4
Load Modifier
5
OCPD Selection Amperes
6
OCPD Ampere Rating
7.
Minimum Conductor Ampacity
8.
Minimum Conductor Size Type THHN/THWN
9.
Ambient Temperature
10
Temperature Correction Factor
11 Number of Branch Circuits Required
Number of Current-Carrying Conductors
Raceway Fill Adjustment Factor
Conductor Ampacity Before Correcting/ Adjusting
12
13
14
15
Conductor Ampacity After Correcting/ Adjusting
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 3:
Load type: C = continuous; N = noncontinuous; M = motor; R = receptacle.
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CHAPTER 4 Branch Circuits
Row 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). 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).
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 be
equal to or greater than the minimum conductor ampacity value in Row 7.
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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 continuous loads.
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