Compliance with NEC and Other Code Requirements

PowerCalc automatically applies many requirements including:

*Items in blue are automatic calculations exclusive to PowerCalc.

IEEE 141 

Recommended Practice for Electric Power Distribution for Industrial Plants

NEC Article 110

Requirements for Electrical Installations

NEC 110.4


NEC 110.6

Conductor Sizes*

NEC 110.9

Interrupting Rating

NEC Articles 210

Branch Circuits

NEC 210.3


NEC 210.8

Ground Fault Circuit Interrupter Protection for Personnel*

NEC 210.10

Ungrounded Conductors Tapped from Grounded Systems

NEC 210.12

Arc Fault Current-Interrupter Protection*

NEC 210.19

Conductors Minimum Ampacity and Size*

NEC 210.20 (A)

Overcurrent Protection Continuous and Non continuous Loads*


NEC Article 215


NEC 215.2

Minimum Rating and Size*

NEC 215.2 A (3)

Minimum Rating and Size: Individual Dwelling Unit or Mobile Home Conductors

NEC 215.3

Overcurrent Protection*

NEC 215.4

Feeders with Common Neutral Conductor

NEC 215.5

Diagrams of Feeders

NEC 215.9

Ground Fault Circuit Interrupter Protection for Personnel*

NEC 215.10

Ground Fault Protection of Equipment*


NEC Article 220

Branch Circuit, Feeder, and Service Calculations

NEC 220.5


NEC 220.12

Lighting Load for Specified Occupancies

NEC 220.14

Other Loads All Occupancies

NEC 220.16

Loads for Additions to Existing Installations*

NEC 220.18

Maximum Loads

NEC 220.40

Feeder and Service Load Calculations*

NEC 220.42

General Lighting*

NEC 220.44

Receptacle Loads Other Than Dwelling Units

NEC 220.50


NEC 220.51

Fixed Electric Space Heating

NEC 220.52

Small Appliance and Laundry Loads: Dwelling Unit

NEC 220.53

Appliance Load: Dwelling Unit(s)

NEC 220.54

Electric Clothes Dryers-Dwelling Unit(s)

NEC 220.55

Electric Ranges and Other Cooking Appliances Dwelling Unit(s)

NEC 220.56

Kitchen Equipment Other Than Dwelling Unit(s)

NEC 220.60

Non coincident Loads*

NEC 220.61

Feeder or Service Neutral Load

Table 220.84

Optional Calculations Demand Factors for Three or More Multifamily Dwelling Units

NEC Article 225

Outside Branch Circuits and Feeders

NEC 225.36

Suitable for Service Equipment*


NEC Article 230


NEC 230.23

Overhead Service Conductor Size and Rating

NEC 230.31

Underground Service Conductor Size and Rating

NEC 230.42

Service: Minimum Size and Rating*

NEC 230.79

Rating of Service Disconnecting Means

NEC 230.90

Service Equipment Overcurrent Protection*

NEC 230.95

Ground-Fault Protection of Equipment*


NEC Article 240

Overcurrent Protection

NEC 240.4

Protection of Conductors*

NEC 240.6

Standard Ampere Ratings

NEC 240.13

Ground Fault Protection of Equipment*

NEC 240.15

Ungrounded Conductors

NEC 240.21

Location in Circuit

NEC 240.23

Change in Size of Grounded Conductor*

NEC 240.30



NEC Article 250

Grounding and Bonding

NEC 250.30

Grounding Separately Derived Alternating-Current Systems*

NEC 250.30 (B)(1)

Grounding Electrode Conductor

NEC 250.52

Grounding Electrodes

NEC 50.66

Size of Alternating Current Grounding Electrode Conductor*

Table 250.66

Grounding Electrode Conductor for Alternating Current Systems*

NEC 250.122

Size of Equipment Grounding Conductors*

NEC 250.122(B)

Increased in Size*

NEC 250.122(C)

Multiple Circuits*

NEC 250.122 (D)

Motor Circuits*

NEC 250.122 (F)

Conductors in Parallel*

NEC 250.122 (G)

Feeder Taps

Table 250.122

Minimum Size Equipment Grounding Conductors for Grounding Conductors for Grounding Raceway and Equipment*


NEC Article 285

Surge Protective Devices (SPDs), 1kV or Less


NEC Article 300

Wiring Methods

NEC 300.1(C)

Metric Designators and Trade Sizes*

NEC Article 310

Conductors for General Wiring

NEC 310.4

Conductors in Parallel

NEC 310.10

Temperature Limitation of Conductors*

NEC 310.15

Ampacities for Conductors Rated 0-2000 Volts

Table 310.15(B)(2)(a)

Adjustment Factors for More than Three Current Carrying Conductors in a Raceway*

Table 310.15(B)(6)

Conductor Types and Sizes for 120/240-Volt, 3 Wire, Single Phase Dwelling Services and Feeders

Table 310.16

Allowable Ampacities of Insulated Conductors Rated 0 Through 2000 Volts, Correction Factors*

NEC 310.60

Conductors Rated 2001 - 35,000 Volts


NEC Article 312

Cabinets, Cutout Boxes, and Meter Socket Enclosures

NEC 312.2

Damp or Wet Locations


NEC Article 344

Rigid Metal Conduit: Type RMC

NEC 344.22

Number of Conductors


NEC Article 408

Switchboards and Panelboards

NEC 408.3(C)

Used as Service Equipment*

NEC 408.3(E)

Phase Arrangement

NEC 408.3(F)

High Leg Identification

NEC 408.4

Circuit Directory or Circuit Identification

NEC 408.30


NEC 408.36

Overcurrent Protection*

NEC 408.40

Grounding of Panelboards*

NEC 408.54

Maximum Number of Overcurrent Devices*


NEC Article 422


NEC 422.11

Overcurrent Protection

NEC 422.52

Electric Drinking Fountains


NEC Article 430

Motors, Motors Circuits, and Controllers

NEC 430.21

Motors Circuit Conductors: General

NEC 430.22

Single Motor*

NEC 430.24

Several Motors or a Motor(s) and Other Load(s)*

NEC 430.25

Multi motor and Combination Load Equipment*

NEC 430.31

Motors and Branch Circuit Overload Protection*

NEC 430.42

Motors on General Purpose Branch Circuits

NEC 430.52

Rating or Setting for Individual Motor Circuit

Table 430.52

Maximum Rating or Setting of Motor, Branch Circuit Short Circuit and Ground Fault Protective Devices

NEC 430.53

Several Motors or Loads on One Branch Circuit

NEC 430.54

Multi motor and Combination Load Equipment*

NEC 430.62

Rating or Setting Motor Load

NEC 430.92

Motor Control Centers

NEC Table 430.248

Full Load Currents in Amperes, Single Phase Alternating Current Motors

Table 430.249

Full Load Current, Two Phase Alternating Current Motors (4 Wire)

Table 430.250

Full Load Current, Three Phase Alternating Current Motors


NEC Article 440

Air Conditioning and Refrigerating Equipment

NEC 440.6

Ampacity and Rating

NEC 440.11

Disconnecting Means

NEC 440.12

Rating and Interrupting Capacity

NEC 440.22

Branch Circuit Short Circuit and Ground Fault Protection

NEC Article 695

Fire Pumps*


NEC Article 700

Emergency Systems


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