# Electrical Calculations and Formulas

 By Dave Rongey Summary: Basic Electrical Calculations for Voltage Drop, Wire Sizing and Power Factors help you understand the requirements for Electrical Projects and Safe Circuit Wiring.

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## Install a Generator Interlock Switch

### So Keep Watching So I Can Help You Wire it Right!

Electrical Calculations and Formulas

Voltage Drop Calculations
Voltage drop is an essential factor in determining the correct wire size to prevent voltage loss which will occur in long distance runs of electrical wire or cable.

Electrical Power Calculations
Electrical power calculations are required to determine the initial load requirement for any given circuit. Power Factors are identified and taken into consideration as well to maintain safety for circuit integrity and performance.

## Related Discussions About Electrical Calculations and Formulas

I am wanting to run wire under ground in a conduit 160' to a 100 amp panel from a meter panel at the pole which will supply power to a carport, future plans are to enclose the carport.

Voltage Drop Calculations
*Disclaimer
Other electrical projects will require extensive consideration when it comes to voltage drop due to the length of the electric service or generator sizing especially when motors will be used, such as well pumps.

To assist you in the planning process I have selected a few resources to help you in the calculation process that I find very helpful.

Voltage Drop Calculator
Calculate the Conductor Size Based On The Project

This Calculator will determine the minimum size conductor needed based on a 3% Voltage Drop. It does not take into consideration other factors such as minimum ampacity based on the National Electric Code Table 310-16. (Allowable ampacity of conductors). Consult The Electrical Code for further details. Voltage Drop Calculation by Nick Debaggis.

Step #1 Describe the Electrical Circuit:

 Conductor Type Phase Voltage Copper Single Phase 120 Volts Aluminum Three Phase 208 Volts 240 Volts 277 Volts 480 Volts

Step #2 Describe the Application:

Distance in Feet, One-Way
Total Amperage of the Circuit

« This is the Minimum Wire Size

### More Electrical Calculations and Formulas:

Generator Sizing Calculator
Ohms Law Formula
Electrical Wire and Cable Selection
Codes for Electrical Service Panels
Electrical Codes for Grounding
Electrical Codes for Underground
Electrical Projects Guidelines

Electrical Power Calculators
Calculators to help you determine the size of generator required for your specific application.  Other calculators for unit conversions and other power related calculations.

Power Calculators

Disclaimer
* Ask-The-Electrician takes no responsibility for any false or misleading information. The use of these calculators are the responsibility of the user only. The results produced by these calculators are not guaranteed to be correct or applicable in all situations.The user must also understand the Electrical Code may or may not be legally acceptable in their area and may be modified or superceded by the locality in which the work is installed.

## Home Electrical Wiring

### Helping You Wire it Right

NOTE: A List of All my Helpful Videos
Will Display at the End of This Video

## Learn more about Home Electrical Wiring with my online Video Course:Basic Home Electrical Wiring by Example

Be sure to get your copy of my BIG New eBook:

Complete Guide to Home Electrical Wiring

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Perfect for Homeowners, Students and Electricians
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Home Electrical Wiring - Room by Room
120 Volt Circuits
240 Volt Circuits
Multi-Wired Circuits
Wiring Methods for Installing Home Electrical Circuit Wiring
Electrical Codes for Home Electrical Wiring
....and much more.

## The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

## The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

## Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.

### More about Electrical calculations and formulas

How to Install an Electrical Sub Panel
Thinking about installing a Sub Panel? Here is what must be considered first, and you may find that you really do not need a sub panel at all.

How to Wire a Generator Transfer Switch Video
What is the Basic Wiring Configuration for a Generator Transfer Switch: Each Wiring Termination must be correct for the Power Conductors of the Line or Load.

Long Distance Electrical Wiring
How to Install and Connect Long Distance Electrical Wiring: Ohms Law and Voltage Drop Calculations, Increased Wire Sizes and Connections to Electrical Devices, Sizing the Circuit Breaker.

Electric Power Supply Wiring for a Solenoid
Power Supply and Wiring for a Solenoid Valve [ad#block]Question: I’m running water through a Ehcotech 12 VDC 450 mA Electric Solenoid Valve. What amp 12 VDC power supply would I need to run this valve if the power supply is 35 feet away from the valve? Should I use a 450 mA, 700 mA, 2 […]

Electrical Wiring for a 220 Volt Compressor
How Electrical Circuit Wiring is Installed for a 220 Volt Air Compressor: I am trying to run 10-3 with ground out to my garage to run a 220 volt air compressor.

UK 220 Volt Electrical System
UK Wiring System and Canadian Circuit Wiring Standards: I will be moving from the UK to Canada and want to bring with me some garage tools 220 volt.

Wire Size for a Home Electrical Service Panel
How to Size Wire for an Electrical Service Panel: What kind of wires do I need to get power to my home?

Is Your Electric Service Panel Big Enough
Is my electric panel big enough for all my appliances? Estimating the Required Electrical Service, Home Electrical Panel Sizes, Circuit Breaker Spaces in Electric Panels.

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