leaferikson
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Joined: Thu May 10, 2018 8:53 pm
Delivery Date: 15 May 2018

Specs for 240v outlet/breaker

Thu May 10, 2018 9:13 pm

Hi, I'm getting my new, 2018 Leaf SL next week and I am having trouble figuring out EXACTLY what specifications are required for the double pole circuit breaker and 240v outlet. I would like to be able to charge at the max, which I believe is 6.6kwh. I've tried very hard to find a post with a clear and concise answer, but most threads I've found relate to upgrading existing 220/240v outlets.

To be clear, I would be thrilled/appreciative if the following could be answered concretely, as I'm having anxiety regarding getting this installed before I bring the leaf home. Mind you, I don't know anything about electrical work, but I want to be able to make sure a hired electrician is installing the correct equipment.

1. What amperage for the double pole circuit breaker? 50 amps?

2. What NEMA rating for the outlet? 14-50? AND is a 250v outlet ok? That seems to be what home depot/lowes sells.

This? https://www.lowes.com/pd/Utilitech-50-A ... et/3775483

3. What gauge electrical wire?

Thanks again in advance. I did spend about 1 hour searching/googling. Honest!

EDIT: The search function works a lot better in these forums than google. I think I found my answer, but if anyone feels like answering here it would still be appreciated.

MikeD
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Delivery Date: 12 May 2011
Leaf Number: 592

Re: Specs for 240v outlet/breaker

Thu May 10, 2018 9:56 pm

I don't think you will be sorry going with the following DEDICATED circuit for your portable EVSE that comes with the 2018 Leaf SL:
1) 50a 240v breaker
2) NEMA 14-50R outlet (I don't think the nominal voltage matters)
3) NM-B 6/3 AWG
Some may say this is more than you need currently, but at least you should sleep well not worrying about adequacy -- and it may pay off in the future in not having to upgrade the circuit.
BTW, I believe that EVSE's cord is about 18 ft in length, so plan the location of your outlet carefully.

I'm adding this here (rather than in a distant additional post):
4) Strongly suggest using a lockable cover (inexpensive) over the receptacle (and always lock it), in order to make it as safe as possible in the way a direct wired EVSE is. This is especially true if you never (or rarely) move the EVSE.
Last edited by MikeD on Sun May 13, 2018 10:11 am, edited 1 time in total.

leaferikson
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Joined: Thu May 10, 2018 8:53 pm
Delivery Date: 15 May 2018

Re: Specs for 240v outlet/breaker

Fri May 11, 2018 4:01 am

Thank you so much, Mike! I really appreciate it!

BillHolz
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Re: Specs for 240v outlet/breaker

Fri May 11, 2018 5:58 am

Concur with MikeD. The outlet you linked is correct. If the wire run is in conduit, your electrician will probably run 4 separate wires rather than 1 NM-B cable. The ground wire (bare or green) can be 10AWG like it is in the NM-B 6/3 AWG cable.
2015 SV no QC

leaferikson
Posts: 3
Joined: Thu May 10, 2018 8:53 pm
Delivery Date: 15 May 2018

Re: Specs for 240v outlet/breaker

Fri May 11, 2018 9:04 am

Thanks again for the responses. My goal is to have all of the supplies for the job on sight when my electrician friend comes - he'll be doing it as a side job.

Is this wire ok?

Cerrowire 147-4203A 25-Feet 6/3 NM-B Stranded with Ground Wire, Black https://www.amazon.com/dp/B00IKVLC62/re ... 9AbEYSY8Y9

And this breaker?

https://low.es/18Flye7

Thanks guys, much love.

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davewill
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Joined: Thu Mar 17, 2011 6:04 pm
Location: San Diego, CA, US

Re: Specs for 240v outlet/breaker

Fri May 11, 2018 9:20 am

leaferikson wrote:Thanks again for the responses. My goal is to have all of the supplies for the job on sight when my electrician friend comes - he'll be doing it as a side job.

Is this wire ok?

Cerrowire 147-4203A 25-Feet 6/3 NM-B Stranded with Ground Wire, Black https://www.amazon.com/dp/B00IKVLC62/re ... 9AbEYSY8Y9

And this breaker?

https://low.es/18Flye7

Thanks guys, much love.

It depends on where he's installing the wire. NM-B is generally installed inside the drywall. If you're installing in conduit on the wall, then you want individual wires.
2014 Rav4 EV, Blizzard Pearl White
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smkettner
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Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: Specs for 240v outlet/breaker

Fri May 11, 2018 5:51 pm

You don't even need an outlet if you get a hardwired EVSE. You need 40 amp circuit and 32 amps charging to go full power. You can go bigger it just will not get utilized. 240 x 32 = 7.68 kW. 40 amp circuit #8 wire is fine.

https://store.clippercreek.com/level2/level2-20-to-32/hcs-40-hcs-40p-ev-charging-station

Honestly I think most would be fine at 24 amps requiring just a 30 amp circuit. 5.76 kW. 30 amp circuit #10 wire is fine.

https://store.clippercreek.com/level2/level2-20-to-32/lcs-30-24-amp-ev-charging-station
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MikeD
Posts: 638
Joined: Thu Jun 24, 2010 6:14 am
Delivery Date: 12 May 2011
Leaf Number: 592

Re: Specs for 240v outlet/breaker

Fri May 11, 2018 7:58 pm

leaferikson: There is one more (somewhat controversial) thing to consider about the breaker choice, i.e. whether or not it is a GFCI type.
From the "2018 Leaf Owner's Manual": " In order to avoid an electric shock or fire due to a short circuit, connect to a GFI (Ground Fault Interrupter) circuit breaker and use a waterproof electrical ground socket."

Downsides:
1) It costs significantly more (at about $100).
2) There may be a risk of "nuisance tripping". If using one results in a frequent such problem (that cannot be remedied), one may have no choice but to use a non-GFCI breaker.
Upsides:
1) It does significantly reduce the possibility of a serious accidental shock while plugging/unplugging, especially if you do this frequently within reach of a (low resistance) ground.

Update to original post:
Partly for testing purposes I have acquired a portable Nissan L1/L2 EVSE designed for use in a 2018 Nissan Leaf (part # 29690-5SA0A), wired it up (temporarily) with a Square D 50a 240v GFCI (part # QO250GFICP) breaker, 70 feet of NM-B 6/2 AWG cable, and a NEMA 14-50R receptacle and then test charged my 2011 Leaf with it multiple times now with no problems -- especially no nuisance tripping. If I were installing the wiring permanently, I would have bought and used 6/3 cable because I think it would be safer (i.e. the circuit is "complete" for any future use).
Last edited by MikeD on Fri May 18, 2018 9:29 pm, edited 1 time in total.

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EVDRIVER
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Re: Specs for 240v outlet/breaker

Fri May 11, 2018 10:04 pm

GFCI is dictated by applicable code . A proper one if required should not trip inappropriately. The LEAF manual is irrelevant as it has no relevance to your local code.
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GlennD
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Re: Specs for 240v outlet/breaker

Fri May 11, 2018 10:33 pm

It really depends on the current. A 40A outlet would have #8 L wires. A real 50A outlet would have #6 L wires. For most EVSE's a 40A circuit is fine. It should be labeled 40A instead of the rated 50A. I have one of the few cars that require a 5oA circuit. I charge at 40A. An enhanced Leaf charges at 27,5A so a 40A circuit is fine. The basic S draws 16A. It will work fine on a 40A circuit but it is overkill.
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