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Electrician Training Electrical Certification wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs wire outdoor light fixture Home Electrical Wiring Diagrams
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

Electrical Code NEC-Table310-16

electrical-wiring
Summary: Table 310-16. Allowable Ampacities of Insulated Conductors Rated 0 through 2000 Volts 60° to 90°C (140° to 194°F) Not More Than Three Current-Carrying Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F).


Allowable Ampacities of Insulated Conductors



Although this is the most common table used to determine wire size, this is just one example.

Based on NEC Table 310-16 as shown in the NEC 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.

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
NEC® and National Electrical Code® are registered trade marks
of the National Fire Protection Association (NFPA).

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Electrical Tips to Help You Wire it Right

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.



Electrical Wiring Questions and Answers