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240 Volt NEMA 14-50 Outlet Installation

Micro517

Member
Aug 25, 2021
20
21
Brooklyn
I’ve decided to go ahead and install a 240V NEMA 14-50 outlet on the outside of my house. Looking for a recommendation for an electrician in the NYC area.

I’d like the outlet to be mounted on a brink wall, and it will most likely be exposed to the elements, if that’s feasible.
 

jcanoe

Active Member
Oct 2, 2020
3,796
3,863
Maryland
The Tesla Wall Connector would be the better choice for an outdoor installation. The Tesla Wall Connector is fully weather rated. The Wall Connector now comes with a 24 foot charging cord. You can purchase a weather housing for the 14-50 receptacle (check on Amazon) but it will not be fully weather rated as moisture can still get into the receptacle. The charging cord on the Mobile Connector is only 18.5 feet in length.

The Wall Connector costs $500 but you won't need a GFCI circuit breaker ($100), only needs 2 wires plus ground instead of 3 wires plus ground for the 14-50 receptacle. The additional cost of the Wall Connector versus the 14-50 receptacle ends up being less than $200.

Also, for 2021 the cost of the circuit, labor and equipment is eligible for a tax credit on your federal income tax (30% of the cost up to $1000). See IRS Form 8911.
 
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Kevrick

Member
Jul 5, 2020
24
37
USA
Jcanoe is spot on. The only thing that I will add is that I decided to go with the 14-50 due to having other pieces of equipment that uses it. So, more utility than anything else. Otherwise, I would have gone for the Wall Connector.
 

jcanoe

Active Member
Oct 2, 2020
3,796
3,863
Maryland
Most 14-50 receptacles are not designed for frequent plugging and unplugging operations. Repeated use of the receptacle can cause the connection that the plug makes with the receptacle to loosen over time. This can cause overheating of the interconnection between the plug and the receptacle. You can monitor the temperature of the receptacle while charging using a digital thermometer. The receptacle may have to be replaced after a relatively short time, i.e. a few years. There are commercial grade 14-50 receptacles that are designed for repeated use. You should ask your electrician to look into installing a commercial grade 14-50 receptacle.
 
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ATPMSD

Member
Mar 12, 2021
440
430
Atlanta, GA
Jcanoe is spot on. The only thing that I will add is that I decided to go with the 14-50 due to having other pieces of equipment that uses it. So, more utility than anything else. Otherwise, I would have gone for the Wall Connector.

@Micro517: In this case you should consider installing the Wall Connector and a 14-50 outlet with an A/B switch. Using the mobile connector outside requires exposure protection for the mobile connector since it is not rated for outdoor use. And as @jcanoe suggested, do not install a cheap 14-50 plug!
 

Big Earl

bnkwupt
Supporting Member
Jul 12, 2017
6,117
11,709
Springfield, VA
The weather rated Mobile Connector with permanently attached NEMA 14-50 plug costs nearly as much as a Wall Connector.

Wall Connector (up to 48 amps) with 24’ cord: $500

Corded Mobile Connector (up to 40 amps) with 20’ cord: $400

Sure, you could use the Mobile Connector that comes with the car, but it’s really not designed for daily outdoor use, as it is not weather tight. Both Mobile Connector options are susceptible to theft whereas the Wall Connector is not.

If you decide that the NEMA 14-50 receptacle is the right choice for you, make sure your electrician installs a Bryant or a Hubbell brand receptacle, not a Leviton brand from your local home store.

 
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carlos31820

Member
Oct 11, 2021
41
38
Georgia
The weather rated Mobile Connector with permanently attached NEMA 14-50 plug costs nearly as much as a Wall Connector.

Wall Connector (up to 48 amps) with 24’ cord: $500

Corded Mobile Connector (up to 32 amps) with 20’ cord: $400

Sure, you could use the Mobile Connector that comes with the car, but it’s really not designed for daily outdoor use, as it is not weather tight. Both Mobile Connector options are susceptible to theft whereas the Wall Connector is not.

If you decide that the NEMA 14-50 receptacle is the right choice for you, make sure your electrician installs a Bryant or a Hubbell brand receptacle, not a Leviton brand from your local home store.

I believe the Corded Mobile Connector pulls up to 40 amps, whereas the regular UMC pulls up to 32 amps.
 
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Jul 10, 2021
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7
28673
Most 14-50 receptacles are not designed for frequent plugging and unplugging operations. Repeated use of the receptacle can cause the connection that the plug makes with the receptacle to loosen over time. This can cause overheating of the interconnection between the plug and the receptacle. You can monitor the temperature of the receptacle while charging using a digital thermometer. The receptacle may have to be replaced after a relatively short time, i.e. a few years. There are commercial grade 14-50 receptacles that are designed for repeated use. You should ask your electrician to look into installing a commercial grade 14-50 receptacle.
I just replaced my cheap 14-50 receptacle with a Bryant commercial grade from Grainger. The cost was $53 and change compared to Amazon at $88. The difference in the two outlets is substantial. I also noticed the charging cable from my wall charger stays much cooler while charging. I now feel much safer that I won't burn my house down. I have my setup at 2 50Amp breakers running my wall charger at 40Amps. This is giving me 36 miles per hour of charge. my app says my charger is running at 244 Volts. Hope this helps.
 
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