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3 awg vs 6 wag length 100 feet and over

RAM1950

New Member
Sep 7, 2015
4
0
Smithfield RI
I'm expecting delivery of my preowned P85 in 2 weeks. Should I spend the extra$ and upgrade my home charger wiring to 3awg from 6awg. The length of wire required will be near or slightly over 100 ft. I will charging at 40 amps Nema 14-50 connector.
 

kennybobby

Member
Sep 14, 2014
478
37
Heart o' Dixie
Not if the 6awg is copper wire, but if aluminum then yes. At 40A with copper you only drop 3 volts for that run, with 3awg copper you drop 1.5 volts.
 
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kennybobby

Member
Sep 14, 2014
478
37
Heart o' Dixie
No with aluminum it would drop 6 volts, but 40A is right at the limit for 6 AWG aluminum, 3 wires in a cable, UF TW wire, etc. FlasherZ is the expert on NEC, i'm just doing voltage drop calculations...
 
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