What size wire you need to use for the current draw you need.
Wiring Home > Electrical > Wire sizes and current draw
When wiring electrical devices yourself, it is extremely important to use the proper size wire for the amount of current that the device will draw. Below ia a quick guide of what size wire to use for the size of the current draw of the device.
Important: This is a general guide, never exceed 80% of the amphere rating. For Example: If the circuit is likely to draw 15 amps, you will need to install a 20 amp circuit.
Note: If your wire run is over 300ft, you will need to consider voltage drop in your circuit.
|Wire Size / AWG.
||Aluminum Wire Max Current
||Copper Wire Max Current
It is important to note that you will not be using aluminum wire to wire receptacles, switches or appliances. These days this really only comes into play with your home service panel.
Conductor Sizes for Service Feeders.
The table below covers the conductor size and type for 120/240 volt, 3 Wire, Single-Phase home services and feeders.
If you are having problems, Play it Safe.
Make sure you check the regulations in the National Electrical Code and your local codes. If you are still unsure of how to properly wire the circuit you are working on, you will need to contact
a qualified electrician in your area. You can also ask questions in our forum.
National Electrical Code Handbook 2008
2008 National Electrical Codebook
Stallcup's Illustrated Code Changes, 2008 Edition
The Complete Guide to Home Wiring (Black and Decker Complete Guides Series)
Guide to Using the National Electrical Code
Residential Remodeling and Repair Professional Reference
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