Indoor charger plug temp 166f, dangerous?

Space_Pony

Well-Known Member
Joined
Jun 7, 2023
Threads
4
Messages
1,707
Reaction score
1,442
Location
Indiana
Vehicles
2023 Premium Mach-E awdX
Country flag
So, long story is my old indoor garage charger failed when I had my 2017 focus, the plastic of the wall plug itself split and the charger stopped working. The plug prongs and socket had burn marks in I of course replaced both.

fast forward to the new socket and charger, it can go as high as 240/40amp.

the photo was taken at 32amps after about 1 hour and 45 minute of charge in a 70f garage.

is 168f something to be worried about? Setting it to 40amps will drive the temp even higherI’ve run it at 40a a couple times when I needed as much charge as possible in a short time but never for more than an hour or 2.

I normally have it set at 20amps. The charger plug barely gets warm this way. If I’m going to charge overnight I’m more comfortable this way.

anyway, I realize your all not electricians and that would be the smartest/best advice to seek.

just curious if this is considered normal as far as you know.

IMG_3470.webp
If you're interested in safety get a quality hardwired EVSE and skip the receptacle. My hardwired Autel has been set at 48 amps for two years with no problems or excessive heat.
Sponsored

 

JohnFoxeSheets

Well-Known Member
First Name
John
Joined
Jan 29, 2022
Threads
28
Messages
3,415
Reaction score
5,514
Location
San Francisco
Website
johnfoxesheets.com
Vehicles
2022 Iced Blue Silver Mach E GT
Occupation
Retired Engineer
Country flag
What @Mach-Lee and @HuntingPudel said. In the interim, before the electrician arrives are the appointed time, in addition to obtaining and having on hand a Hubbell or Bryant 50A outlet (not 40A), yes, if you need to charge your car, you should charge at 20A. (Note, the fact that the wire going into the breaker box isn't hot doesn't mean you don't have a problem elsewhere. Apparently the wire to the outlet is the correct gauge. That's great, as it's harder to change out the wire than the outlet. But the outlet does need to be changed, pronto. (Or and @Space_Pony says, get a hard-wired EVSE and have the electrician install it instead. Unless you have a strong reason to be able to unplug the EVSE, hard-wiring is the way to go. It is much less likely to result in a problem.)
 

PilotMark

Well-Known Member
First Name
Mark
Joined
May 28, 2022
Threads
22
Messages
272
Reaction score
305
Location
Virginia
Vehicles
2022 Mach E Extended, Mini Moke, FRS, Prius, FJR, 1966 Shelby Mustang
Country flag
As explained to me when I wanted a plug instead of hard wired.
There are 3 types of 40 amp receptacles. All say 40 amps and all look pretty much the same.

Residential designed to be cheap for dryers or ovens as they only draw 40 amps very briefly while they are on. $9 or $10 - do not use!

Commercial designed to be used with heavy shop equipment drawing heavy amperage for longer periods but not really full 32 amps for 10 hours straight. $50

Industrial designed to pull the full 40 amps 24x7 $100 I chose this one so I could charge and sleep at the same time.
 

Trielectric

Well-Known Member
Joined
Feb 12, 2025
Threads
1
Messages
119
Reaction score
87
Location
SouthEast US
Vehicles
Mach e Rally 2025, had 2 Ford Focus Electrics & an I-Pace
Occupation
Retired
So, long story is my old indoor garage charger failed when I had my 2017 Focus
In 2016 Ford Focus Electrics had a recall on the 120v chargers that came with the car. Ford swapped them out for the same charger with a temperature switch(bimetal) in the Plug head that would trip the charger on a high temperature. Mine still works. I had problems with my 2012 FFE getting the plugmold hot and I changed the 120v plug mold out for a heavy duty socket and never had any more problems with that. I also purchased a heavy duty 240v plug mold and have had no problem with it on my Jag or my Rally. Unfortunately the temperatures in the Jags battery are too high now and it is a buy back.
 

HuntingPudel

Well-Known Member
First Name
Steve
Joined
Mar 23, 2021
Threads
88
Messages
12,942
Reaction score
17,391
Location
Bay Area, CA
Vehicles
2024 MME GT with Performance Upgrade, 1979 Fire-Am, 1972 K/5 Blazer
Occupation
Engineering
Country flag
As explained to me when I wanted a plug instead of hard wired.
There are 3 types of 40 amp receptacles. All say 40 amps and all look pretty much the same.

Residential designed to be cheap for dryers or ovens as they only draw 40 amps very briefly while they are on. $9 or $10 - do not use!

Commercial designed to be used with heavy shop equipment drawing heavy amperage for longer periods but not really full 32 amps for 10 hours straight. $50

Industrial designed to pull the full 40 amps 24x7 $100 I chose this one so I could charge and sleep at the same time.
Small correction to this: There are no common 40A NEMA receptacles. The common receptacle types are rated at 15A, 20A, 30A, 50A, and 60A. The most common home 240V receptacles are 50A (6-50 or 14-50) since L2 EVSEs are commonly 32A or 40A. In the NEMA schema, the number before the hyphen is the Receptacle/Plug family (which indicates voltage/phase compatibility), the number after the hyphen is the maximum ampere load it's designed to handle, and the letter following the second number designates whether it's a Receptacle (R) or a Plug (P). See the chart below. ??

Ford Mustang Mach-E Indoor charger plug temp 166f,  dangerous? NEMA configuration
 


jh2021

Active Member
First Name
Jay
Joined
Feb 6, 2024
Threads
1
Messages
26
Reaction score
6
Location
Illinois
Vehicles
2021 Mustang Mach E
Occupation
Retired
Country flag
So, long story is my old indoor garage charger failed when I had my 2017 focus, the plastic of the wall plug itself split and the charger stopped working. The plug prongs and socket had burn marks in I of course replaced both.

fast forward to the new socket and charger, it can go as high as 240/40amp.

the photo was taken at 32amps after about 1 hour and 45 minute of charge in a 70f garage.

is 168f something to be worried about? Setting it to 40amps will drive the temp even higherI’ve run it at 40a a couple times when I needed as much charge as possible in a short time but never for more than an hour or 2.

I normally have it set at 20amps. The charger plug barely gets warm this way. If I’m going to charge overnight I’m more comfortable this way.

anyway, I realize your all not electricians and that would be the smartest/best advice to seek.

just curious if this is considered normal as far as you know.

IMG_3470.jpeg
Mine was doing that after a melted outlet. GrizzlE eventually replaced the charger and temps returned to normal range.
 

HuntingPudel

Well-Known Member
First Name
Steve
Joined
Mar 23, 2021
Threads
88
Messages
12,942
Reaction score
17,391
Location
Bay Area, CA
Vehicles
2024 MME GT with Performance Upgrade, 1979 Fire-Am, 1972 K/5 Blazer
Occupation
Engineering
Country flag
 







Top