Home Electrical Wiring
»NEW eBOOK«
wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs
wire outdoor light fixture Residential Wiring Layouts
wiring home generator and transfer switch wiring a 220 volt range cord outlet Wiring for GFCI Outlets Wiring Outlets and a Switched Outlet Wiring and Installing Ceiling Fans and Remote Controls wire dimmer switch wiring diagrams for switches wiring a dryer cord and 220 outlet circuit breaker panel
Electrical Wire and Cable
Do-it-Yourself Electrical Wiring Articles | Electrical Wiring Diagrams | Electrical Questions and Answers | Electrical Questions Blog
electrical-wiring
electrical-repairs

What is the Electrical Wire Capacity

electrical-wire-code

Summary: The amperage capacity of electrical wire is determined by a few factors. as shown in the NECT table 310-16 below the temperature rating of the insulation has much to do with how much electrical current the wire is designed to withstand.

Safe Home Electrical Wiring Practices when choosing Wire Sizes


Electrical Wire Capacities
It is essential to understand that there are allowable ampacities of insulated wire conductors.

The insulation materials used to protect the actual wire conductor are designed for specific applications.

Some types of wire insulation protect the wire against overheating and external elements such as direct sunlight exposure, moisture as well as some corrosive substances, to mention just a few.

Not all wire insulation types are designed the same, therefore they have specific amperage capacities.



Allowable Ampacities of Insulated Wire Conductors
Based on NEC Table 310-16
  60 Deg C
(140 Deg F)

75 Deg C
(167 Deg F)

90 Deg C
(194 Deg F)
60 Deg C
(140 Deg F)

75 Deg C
(167 Deg F)

90 Deg C
(194 Deg F)
Wire
Types
TW,
UF
RHW, THHW, THW, THWN, XHHW THHN,
THWN-2,
XHHW
TW,UF RHW, THHW, THW, THWN, XHHW THHN, THWN-2, XHHW
Size Copper Aluminum
#14 20 20 25 - - -
#12 25 25 30 20 20 25
#10 30 35 40 25 30 35
#8 40 50 55 30 40 45
#6 55 65 75 40 50 60
#4 70 85 95 55 65 75
#3 85 100 110 65 75 85
#2 95 115 130 75 90 100
#1 110 130 150 85 100 115

Although this table is true and accurate, many times the wire type is not known. There are also instances where more than one type of wire is used on a circuit. This is why it is best to use this default chart to determine the capacity of the wire sizes listed below
.
Please Note: This table is for Copper Wire Only:

Wire
Amperage
#14 15
#12 20
#10 30
#8 40


related



»Avoid Costly Mistakes«
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project,
Perfect for Homeowners, Students and Electricians!
Complete Guide to Home Electrical Wiring
» Click here to learn more about Home Electrical Wiring «
Including:

  • Fully Illustrated
  • Home Electrical Wiring - Room by Room
  • Wiring 120 and 240 Volt Circuits
  • Wiring Main Panels
  • Underground and Overhead Services
  • Grounding and Bonding
  • 55 Electrical Code Topics
  • 6 Most Commonly Used Code Tables
  • 11 Home Wiring Plans
  • Over 370 Photos
  • 28 Wiring Diagrams and Illustrations
  • Illustrated Wiring Methods
  • Wiring Codes for Home Electrical Wiring
  • ....and much more.

Be Sure to Get Your Copy Today!
electrical wiring
 


Top of Page



Site Terms | Disclaimer | | Privacy Policy | Disclosure Policy
Site Map | Trademark Copyright Information | Contact Dave | Electrical Troubleshooting Blog


Do You Need Electrical Help? Ask an Electrical Question

Part P - Electrical Safety is registered Crown Copyright of the UK Government Planning Department for Communities
CE and Canadian Electrical Code CSA C22.1 are registered trade marks of the Canadian Standards Association (CSA)
NEC and National Electrical Code are registered trade marks of the National Fire Protection Association (NFPA)
©Copyright Ask-The-Electrician.com -