Wire Gauge Ampacity: Difference between revisions
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=Basics= | =Basics= | ||
*How much Electrical Current a wire, and to an extent a circuit, can carry | |||
*Important to calculate so that you don't have [[Electrical Fires]] due to Overheating | |||
*Copper resistivity - 100 compared to aluminum 160. [https://help.leonardo-energy.org/hc/en-us/articles/205394842-Why-use-copper-rather-than-aluminium-as-the-conductor-in-power-cables-] | *Copper resistivity - 100 compared to aluminum 160. [https://help.leonardo-energy.org/hc/en-us/articles/205394842-Why-use-copper-rather-than-aluminium-as-the-conductor-in-power-cables-] | ||
*Aluminum has about 60% the conductivity of copper, but 30% the weight for a given diameter. All together, aluminum cable is half the weight of copper for the same ampacity. [https://www.anixter.com/en_us/resources/literature/wire-wisdom/copper-vs-aluminum-conductors.html] | *Aluminum has about 60% the conductivity of copper, but 30% the weight for a given diameter. All together, aluminum cable is half the weight of copper for the same ampacity. [https://www.anixter.com/en_us/resources/literature/wire-wisdom/copper-vs-aluminum-conductors.html] | ||
**It is however cheaper, at least in terms of the conductors, [[Aluminum Wire Compatible Outlets]] etc may complicate the budgeting, but Aluminum or [[Copper Clad Aluminum]] (CCA) are worth considering | |||
=Tables - Copper= | =Tables - Copper= | ||
#Engineering Toolbox - [https://www.engineeringtoolbox.com/wire-gauges-d_419.html] | |||
#Powerstream - [https://www.powerstream.com/Wire_Size.htm] | |||
=[[Copper Clad Aluminum]] (CCA)= | |||
=Copper Clad Aluminum (CCA)= | |||
*[http://wire.buyawg.com/viewitems/all-categories-appendix-allowable-ampacities/sulated-aluminum-or-copperclad-aluminum-conductors] | *[http://wire.buyawg.com/viewitems/all-categories-appendix-allowable-ampacities/sulated-aluminum-or-copperclad-aluminum-conductors] | ||
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=22 Ga for D3D= | =22 Ga for D3D= | ||
*At 24V we need 5A for the main power supply, so 22 ga should be good. 80C rating of [https://smile.amazon.com/gp/product/B00QTCBZ4I/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1]. Engineering Toolbox says 1 strand is good for 5A. | *At 24V we need 5A for the main power supply, so 22 ga should be good. 80C rating of [https://smile.amazon.com/gp/product/B00QTCBZ4I/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1]. Engineering Toolbox says 1 strand is good for 5A. | ||
=Discussion= | |||
*What are the limits to motor startup current, and common house wire? See discussion at Wire Ampacity: | |||
<html> <iframe src="https://docs.google.com/presentation/d/e/2PACX-1vQQpffQ16pxxJbCkwWsZcO1-4it8DByYepnV72iBmrHqki8IYkVVWk384NzwADCFKiTbjRsdm6FHPoy/embed?start=false&loop=false&delayms=3000#slide=id.g1090e189c8c_0_0" frameborder="0" width="480" height="389" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe> </html> | |||
[https://docs.google.com/presentation/d/1qzTNV2n-UMCY6J5qQG_geLeMq_7ycntecO-R-snSdx0/edit#slide=id.g1090e189c8c_0_0 edit] | |||
[[Category: Electronics]] [[Category: Calculators, Quick References, and Tables]] | |||
Latest revision as of 18:28, 31 August 2023
Basics
- How much Electrical Current a wire, and to an extent a circuit, can carry
- Important to calculate so that you don't have Electrical Fires due to Overheating
- Copper resistivity - 100 compared to aluminum 160. [1]
- Aluminum has about 60% the conductivity of copper, but 30% the weight for a given diameter. All together, aluminum cable is half the weight of copper for the same ampacity. [2]
- It is however cheaper, at least in terms of the conductors, Aluminum Wire Compatible Outlets etc may complicate the budgeting, but Aluminum or Copper Clad Aluminum (CCA) are worth considering
Tables - Copper
Copper Clad Aluminum (CCA)
Free Air
- "Directly from 4-004(1)(a), you must maintain a cable spacing not less then 100% of the larger cable diameter" - [6]
22 Ga for D3D
- At 24V we need 5A for the main power supply, so 22 ga should be good. 80C rating of [7]. Engineering Toolbox says 1 strand is good for 5A.
Discussion
- What are the limits to motor startup current, and common house wire? See discussion at Wire Ampacity: