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Correct gauge wire for ev 14-50 installation. Garage is up to 50' from breaker

Home Improvement Asked by Keon Young Park on August 14, 2021

new here.
I’ve decided to diy my basement bathroom, but before I close it up I wanted to upgrade the electrical.
The garage is very far from the panel (very conservatively 50 ft away, more likely close to 40 ft). Will a 6 gauge wire be sufficient? I’m not sure if I’m reading the voltage drop calculators right etc. I think at the end of the day it will be a GFCI 14-50. Any feedback is much appreciated.

One Answer

There are variables that determine temperature rating of circuit, wire type, wire insulation type, cable/conduit temperature rating, conduit fill or cable grouping, and device (breaker and receptacle) rating. The minimum rating of any component subjects the whole circuit to the minimum rating.

#8 copper THWN in conduit with only a few circuits, and a high quality 75°C you are likely good to go. 60°C receptacle you are going to need #6.

#6 aluminum SE cable you are good to go if you have a 75°C receptacle, if you have a typical retail 60°C receptacle you would need #4 aluminum.

Your specific wiring method and routing could modify the end result.

50 feet is not an issue, the code has built in deratings that easily cover 100'.

Answered by NoSparksPlease on August 14, 2021

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