Inspector Calculations Topics

Electrical Inspector Calculations Topics Practice Worksheets

Here is a list of Electrical Inspector calculation topics. You may want to set this index page as a shortcut on your desktop with a right click.

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These practice worksheets are intended to be used with a Texas Instruments® TI-30Xa calculator.

Ohms Watts  Series  Parallel Circuits  AC Circuits

1 Ohms Watts Calculations EIRP
2 Ohms Watts Calculations EIRP
3 Ohms Watts Calculations EIRP
4 Ohms Watts Calculations EIRP
5  Ohms Watts Story Problems
6  Worksheet
7  Worksheet
8  Pythagorean Theorem
9  Trigonometry  sin  cos  tan
10  Alternating Current Circuit Calculations
11  AC Circuit Story Problems  1Ų
12  Worksheet
13  Worksheet
14  AC Circuit Calculations  E  I  R  Xl  Z  angle   sin  cos  tan
15  AC 1Ų Power Calculations
16  AC 3Ų Power Calculations
17  AC 1Ų Horse Power
18  AC 3Ų Horse Power
19  AC Story Problems 3Ų
20  Worksheet
21  Worksheet
22  Series Circuit Story Problems
23  Worksheet
24  Worksheet
25  Parallel Circuit Story Problems
26  Worksheet
27  Worksheet
28  AC Circuit 3Ų Story Problems
29  Worksheet 
30  Worksheet 

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Box Sizing  Pull Boxes  Conduit Fill  Wireways  Nipple Fill

31  Box Sizing
32  Junction Box Sizing
33  Box Fill  -  NM Cable
34  Box Fill  -  Story Problems
35  Box Fill  -  Story Problems
36  Box Fill  -  Story Problems
37  Box Fill  -  Story Problems
38  Pull Boxes  -  Straight Pulls  -  Angle Pulls
39  Pull Boxes  -  U Pulls  -  Back-of-the-Box Pulls
40  Pull Boxes  -  Multiple Entries
41  Pull Boxes  -  Multiple Entries
42  Gutter Sizing
43  Metal Wireways
44  Conduit Fill  -  Maximum Number of Conductors Permitted
45  Conduit Fill  -  Look Ups
46  Conduit Fill  -  Table Based on 2005 NEC®  -  40%
47  Conduit Fill  -  Calculation Worksheet
48  Conduit Fill  -  Calculation Worksheet
49  Conduit Fill  -  Calculation Worksheet
50  Conduit Fill  -  Various Raceway Types
51  Conduit Fill  -  Story Problems
52  Conduit Fill  -  Story Problems
53  Surface Metal Raceway  -  Wiremold®
54  Nipple Fill  -  Table Based on 2005 NEC®  -  60%
55  Nipple Fill  -  Various Raceway Types
56  Nipple Fill  -  Look Ups
57  Nipple Fill  -  Story Problems
58  Nipple Fill  -  Story Problems
59  Conduit and Nipple Fill  -  Percentage Practice
60  Multioutlet Assemblies

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 Ampacity Determination  Conductor Resistance  Voltage Drop

61  Ampacity Look Ups
62  Ampacity Correction  -  Ambient Temperature Correction Factor
63  Ampacity Correction  -  Conduit Fill Correction Factor
64  Ampacity Correction  -  Continuous Load Correction Factor
65  Ampacity Correction  -  All Three Factors
66  Ampacity Correction  -  Find Conductor When Load is given
67  Ampacity Correction  -  Story Problems
68  Worksheet
69  Worksheet
70  Paralleled Conductor Ampacity Correction
71  Resistance of Small Conductors
72  Conductor Resistance
73 Ampacity Correction  -  Free Air
74  Combination Load  -  Ampacity Determination
75  Maximum Unbalanced Load  -  Single Phase
76  Voltage Drop  -  Constants
77  Voltage Drop  -  Calculations
78  Voltage Drop  -  Calculations
79  Voltage Drop  -  Calculations
80  Voltage Drop  -  Percentages
81  Voltage Drop  -  Story Problems
82  Worksheet
83  Worksheet
84  Voltage Drop  -  Resistance Method
85  Voltage Drop  -  Percentages
86  Voltage Drop  -  Feeders  -  Branch Circuits
87  Voltage Drop  -  Multiple Legs
88  Voltage Drop  -  Three Phase
89  Voltage Drop  -  Three Phase
90  Voltage Drop  -  Three Phase

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Transformers  Residential Service Aspects

91  Transformer Calculations  -  Ep  Es  Np  Ns
92  Transformer Calculations  -  Ep  Es  Ip  Is  Np   Ns  eff
93  Transformer Calculations  -  Ip  Is  Np  Ns  eff
94  Transformer Calculations  -  Ep  Es  Np  Ns  ratio
95  Transformer Calculations  -  Ep  Es  Ip  Is  Pp   Ps  eff
96  Transformer Calculations  -  Ep  Es  Ip  Is  Pp   Ps  Np  Ns  eff step
97  Transformer Calculations  -  Ep  Es  Ip  Is  Pp   Ps  Np  Ns  eff  step
98  Transformer Proportionalities
99  Transformer  -  Story Problems
100  Worksheet
101  Worksheet
102  Transformer  -  Story Problems
103  Worksheet
104  Worksheet
105  Transformer  -  Story Problems
106  Worksheet
107  Worksheet
108  Combination  -  Feeder Amps  -  Branch Circuit Amps
109  General Lighting Loads
110  Receptacle Loads  -  Receptacle Demand
111  Lighting Load Feeder Demand
112  Dryer  -  Residential Demand
113  Kitchen Appliances  -  Commercial Demand
114  Feeder Neutral
115  Grounding Electrode Conductor for Paralleled Services
116  Equipment Grounding Conductor Due to Voltage Drop Change
117  Open Neutral  -  Volts/Ohms
118  Open Neutral  -  Volts/Voltamperes
119  Tap Conductor Sizing
120  Appliance Output at Below Nameplate Voltage

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Motor Aspects  Utilization Equipment  Short Circuit Current

121  Motor Full Load Current  -  Disconnect Size
122  Motor Full Load Current  -  Interpolation
123  Motor Conductor Sizing
124  Motor Branch Circuit Protective Devices
125  Motor Overloads
126  Motor Overcurrent Protection
127  Motor Feeders  -  Feeder Protection
128  Motor Feeder Overcurrent Protection
129  Motor Efficiency  -  Generator Efficiency
130  Motor Volt amperes
131  Motor Power
132  Motor Calculations  -  Story Problems
133  Motor Calculations  -  Story Problems
134  Motor Full Load Current  -  3Ų
135  Motor Full Load Current  -  3Ų Synchronous Type
136  Motor Full Load Current  -  3Ų Interpolation
137  Motor Conductor Sizing  -  3Ų
138  Motor Overcurrent Protection  -  3Ų
139  Motor Overloads  -  3Ų
140  Motor Feeder Overcurrent Protection  -  3Ų
141  AC Refrigeration Equipment
142  Transformer Calculations
143  Capacitor Calculations
144  Cranes and Hoists
145  Individual Welders
146  Groups of Welders
147  Resistance  -  per 1000 feet  -  Copper
148  Multiple Motor Disconnect Horse Power
149  Three Phase 4 - wire Neutral Current
150  Available Short Circuit Current 

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 Residential Services  Branch Circuit Conductors  Commercial Services

151  Residential Lighting Loads  -  Circuits
152  Residential Service Calculations  -  Net Lighting
153  Residential Service Aspects  -  Standard Calculation
154  Range Feeder Demand  -  Column  A B C
155  Range Feeder Demand  -  Note 1
156  Range Feeder Demand  -  Note 2
157  Range Feeder Demand  -  Weird Combinations
158  Household Cooking Appliances  -  Story Problems
159  Complete Service Calculations  -  Residential Standard
160  Branch Circuit Conductors  -  Household Cooking Appliances
161  Branch Circuit Conductors  -  Dryers Water heaters
162  Branch Circuit Conductors  -  Heat and AC
163  Service Calculations  -  Mobile Home Park
164  Service Calculations  -  Standard  -  Duplex
165  Service Calculations  -  Optional  -Duplex
166  Service Calculations  -  Duplex Dwelling Units
167  Service Calculations  -  Multi Family Dwelling
168  Service Calculations  -  Multi Family Dwelling
169  Service Calculations  -  Multi Family Dwelling
170  Service Calculations  -  Recreational Vehicle Park
171  Commercial Service Calculations  -  Barber Shop
172  Commercial Service Calculations  -  Beauty Parlor
173  Commercial Service Calculations  -  New Restaurant  -   Standard
174  Commercial Service Calculations  -  New Restaurant  -   Optional
175  Commercial Service Calculations  -  Office Building
176  Commercial Service Calculations  -  Bank
177  Commercial Service Calculations  -  School Service  -   Standard
178  Commercial Service Calculations  -  School Service  -   Optional
179  Commercial Service Calculations  -  School Service  -   Optional
180  Service Configurations

Listen to my audio file on Bad Questions and how to handle them. Click HERE.

Listen to my audio file on Tricky Questions. Click HERE.

Helpful stuff:

Search Term Index

Reference
Formulas
Appendix

Substitution Algebra

Math Tips 

Journeyman Electrician  Practice Exams

Master Electrician Practice Exams

Math Book For Electricians

Theory Book For Electricians

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