Tagar
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two-phase 50amps electric switch for EV charger

Sun Nov 18, 2018 9:26 pm

I will be installing a NEMA 14-50 outlet/socket for my Level 2 EV charger.

On average, it'll be about one connect-disconnect cycle a day.

To avoid wear, I'd like to install a two-phase switch that will disconnect this NEMA 14-50 outlet. (also it'll be much more convenient to use a switch as pulling this plug might be hard, especially for my wife)

It has to be a two-phase switch, rated to at least 250V / 50 amps. Since it'll be inside of a garage, it doesn't have to be weather-proof.

Spent an hour in Internet, and closest match I found is this -
Image
but this one is only 20amps.

Also on an Australian web site found interesting switch+socket combined:
- Image
although it would be ideal, I don't expect to find one for NEMA 14-50 outlet.

So any ideas for just a two-phase switch rated for 50 amps would be greatly appreciated.

Can be either for surface or flush mounting.

PS. Also asked this question at https://diy.stackexchange.com/questions ... ric-switch

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Nubo
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Re: two-phase 50amps electric switch for EV charger

Sun Nov 18, 2018 10:16 pm

The EVSE is itself a switch; this is part of its function so that the charge cable is never energized unless the car is actively charging. It also protects against ground faults. The only "always hot" part is the very short cable from the receptacle to the unit. So, I am unclear as to why you want to pull the plug or add an additional switch?

https://en.wikipedia.org/wiki/SAE_J1772#Safety
I noticed you're still working with polymers.

smkettner
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Re: two-phase 50amps electric switch for EV charger

Sun Nov 18, 2018 10:35 pm

Why are you unplugging every day? Just mount it to the wall and leave the power on.

https://www.homedepot.com/p/GE-60-Amp-240-Volt-Fusible-Indoor-General-Duty-Safety-Switch-TG3222/202978653
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV
I-Pace on order for end of 2018 delivery

GerryAZ
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Re: two-phase 50amps electric switch for EV charger

Sun Nov 18, 2018 11:08 pm

The GE disconnect switch is a good choice for isolating the receptacle, but you should not use it to stop/start charging. Always use the J1772 connector to start/stop charging by plugging/unplugging the car. The car stops drawing current when the release button is pressed on the J1772 handle so there is no arcing and no abrupt current interruption.
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

Tagar
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Re: two-phase 50amps electric switch for EV charger

Mon Nov 19, 2018 10:32 am

Nubo wrote:The EVSE is itself a switch; this is part of its function so that the charge cable is never energized unless the car is actively charging. It also protects against ground faults. The only "always hot" part is the very short cable from the receptacle to the unit. So, I am unclear as to why you want to pull the plug or add an additional switch?

https://en.wikipedia.org/wiki/SAE_J1772#Safety


Just being extra cautious

On a more minor side - charger, even when not connected to EV (not charging), still draws some current. On a more concerning side, I feel more comfortable if any electronics including an EV charger sitting on a 50amps two-phase breaker is disconnected when not used

Tagar
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Re: two-phase 50amps electric switch for EV charger

Mon Nov 19, 2018 10:36 am

GerryAZ wrote:Always use the J1772 connector to start/stop charging by plugging/unplugging the car. The car stops drawing current when the release button is pressed on the J1772 handle so there is no arcing and no abrupt current interruption.


I understand it stops drawing most of the power when it's disconnect from a Leaf.
Although it continues to draw some standby power. Also the line that goes from receptacle to the charger continues to be energized with 240 Volts, on a 50 amps breaker.. that freaks me out a little bit.

LeftieBiker
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Re: two-phase 50amps electric switch for EV charger

Mon Nov 19, 2018 12:28 pm

I understand it stops drawing most of the power when it's disconnect from a Leaf. Although it continues to draw some standby power. Also the line that goes from receptacle to the charger continues to be energized with 240 Volts, on a 50 amps breaker.. that freaks me out a little bit.


Do you unplug your range or electric dryer when not in use?
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
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PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Reddy
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Re: two-phase 50amps electric switch for EV charger

Mon Nov 19, 2018 12:31 pm

Tagar wrote:
GerryAZ wrote:Always use the J1772 connector to start/stop charging by plugging/unplugging the car. The car stops drawing current when the release button is pressed on the J1772 handle so there is no arcing and no abrupt current interruption.


I understand it stops drawing most of the power when it's disconnect from a Leaf.
Although it continues to draw some standby power. Also the line that goes from receptacle to the charger continues to be energized with 240 Volts, on a 50 amps breaker.. that freaks me out a little bit.
Wow, so you do you also unplug your electric range, electric dryer, electric hair drier, coffee pot, TV, etc. every day? I understand the concern, but these devices are designed to be plugged in and left. The electric receptacles, however, are not designed to be plugged and un-plugged very often. BTW, I use my manufacturer-supplied cord to charge everyday, leaving the cord plugged in all the time, except when traveling out-of-town.
Reddy
2011 SL; 9 bar, 45.80 AHr; 45,000 mi; rcv'd Aug 18, 2011
Long: http://www.mynissanleaf.com/viewtopic.p ... al#p226115"
Cold: http://www.mynissanleaf.com/viewtopic.p ... 60#p243033"

smkettner
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Re: two-phase 50amps electric switch for EV charger

Mon Nov 19, 2018 7:02 pm

LeftieBiker wrote:
I understand it stops drawing most of the power when it's disconnect from a Leaf. Although it continues to draw some standby power. Also the line that goes from receptacle to the charger continues to be energized with 240 Volts, on a 50 amps breaker.. that freaks me out a little bit.
Do you unplug your range or electric dryer when not in use?
Alarm clock and computer too?
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV
I-Pace on order for end of 2018 delivery

Tagar
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Joined: Sun Nov 18, 2018 9:22 pm
Delivery Date: 23 Sep 2018

Re: two-phase 50amps electric switch for EV charger

Mon Nov 19, 2018 9:52 pm

Reddy wrote:BTW, I use my manufacturer-supplied cord to charge everyday, leaving the cord plugged in all the time, except when traveling out-of-town.


Why do you unlpug it when you're traveling out of town? It's designed to be plugged everyday :lol:

I totally get your examples on electric range and electric dryer. Those made me think, and I almost agree with you.
Better examples though - hot tub that has similar to EV voltage/ amperage, and The National Electrical Code (NEC) specifies
installation of an approved manual disconnect device adjacent to the hot tub, at least 5 feet away, and within line of sight.

I think NEC hasn't caught up yet with EV chargers, and IMO it might be mandated later by the National Electrical Code to have
a similar to hot tubs disconnect device.

Back to the subject, I got some good ideas at
https://diy.stackexchange.com/questions ... ric-switch

I started this thread just to brainstorm ideas. Thank you everyone. That was a good feedback.

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