What size feeder do you recommend for a 100 amp sub panel located over 250 feet away, using aluminum instead of copper?
Asked by Angel Lopez 
2 months ago
Last Updated: July 26, 2024
What size feeder do you typically use for a 100 amp sub panel that is over 250 feet away? Also, do you use aluminum instead of copper in this situation?
They actually have an app for that, pretty funny!
Do you know what the app is called?
Is a pro in electrical wiring.
An electrician can help determine the appropriate size for that
Using a lamp cord should suffice
Hey , if you bury it directly, the dirt should help keep it cool.
Try using the Southwire voltage drop calculator
#2 aluminum service entrance wire
Exposed to air or buried underground?
Just need to size the voltage drop based on the load. The 100 amp panel shouldn’t exceed 80 amps. I used 3/0 aluminum for a 300′ run at 240 volts
750 kcm is definitely 750…
If you just use #10 thhn wire, you’ll probably be okay.
Oh hey, I forgot to mention burying #10 THHN directly in the ground without using conduit.
14-2 romex
4/0 4/0 4/0 2/0 aluminum mobile home feeder
4 gauge Copper
You can calculate that
Voltage?
Much larger than what can fit in a 100 amp lug
String drenched in salty water.
If you run 14-2, you’ll have a blast.
Voltage drop calculation for single phase: 2 x Length x Constant x Current / Cross-Sectional Area. It is advised to keep the voltage drop under 3%. There you have it.
What type of sheetrock are you utilizing? What type of hammer are you utilizing? What type of nails are you utilizing? What type of medication are you currently taking? 🤣🤣🤣
It seems like there’s a specific guideline for this…but it’s probably best for non-experts to skip it.