MikeD
Posts: 659
Joined: Thu Jun 24, 2010 6:14 am
Delivery Date: 12 May 2011
Leaf Number: 592

Re: 2019 Leaf

Mon Jul 16, 2018 10:51 pm

So to charge at the maximum 11kW charging rate at a single phase service home means having a 60a 240v circuit? And a maximum 80% of 60a = 48a circuit current? Do they make NM-B 4/2 cable (for a direct wired EVSE)?

Evoforce
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Joined: Wed Mar 04, 2015 9:58 pm
Delivery Date: 28 Feb 2015
Location: Fountain Hills Arizona

Re: 2019 Leaf

Mon Jul 16, 2018 11:36 pm

This is excellent news! I am excited for it to hit the market.
*2011 Leaf 1 bought 2/28/15 @ 28,000ish mi 10 bar (8 bars @ 11/25/15 @ 37,453 ) (New lizard @ 39,275 mi @ 1/20/2016) Now 52,166 mi.
*Tesla Model S 61,000 mi
*2011 Leaf 2 bought 4/28/15 @ 24,000ish mi 12 bar (new lizard Dec. 2014 @ 22,273 mi) Now 35,485 mi

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Nubo
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Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: 2019 Leaf

Tue Jul 17, 2018 9:24 am

johnlocke wrote:...22KW charging could be 480VAC single phase as well but that tends to be an industrial voltage.


480V is 3-phase.
I noticed you're still working with polymers.

johnlocke
Posts: 299
Joined: Fri Jan 08, 2016 3:47 pm
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Leaf Number: 300582

Re: 2019 Leaf

Wed Jul 18, 2018 7:13 pm

Nubo wrote:
johnlocke wrote:...22KW charging could be 480VAC single phase as well but that tends to be an industrial voltage.


480V is 3-phase.

The voltage actually is 277 VAC/480 VAC Y configuration. 277 VAC phase to neutral. 480 VAC Phase to phase. Delta config is possible (no neutral) but is not commonly used.
2016 SV, New battery at 45K mi.
Jamul, CA
San Diego East County

johnlocke
Posts: 299
Joined: Fri Jan 08, 2016 3:47 pm
Delivery Date: 14 Dec 2015
Leaf Number: 300582

Re: 2019 Leaf

Wed Jul 18, 2018 7:20 pm

MikeD wrote:So to charge at the maximum 11kW charging rate at a single phase service home means having a 60a 240v circuit? And a maximum 80% of 60a = 48a circuit current? Do they make NM-B 4/2 cable (for a direct wired EVSE)?

No, 6 gauge would be adequate. Think electric range cord.
2016 SV, New battery at 45K mi.
Jamul, CA
San Diego East County

wwhitney
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Delivery Date: 01 Apr 2011
Location: Berkeley, CA

Re: 2019 Leaf

Wed Jul 18, 2018 10:37 pm

johnlocke wrote:No, 6 gauge would be adequate. Think electric range cord.

If using Romex, the #6 copper is limited to 55A. So that may mean the EVSE would be limited to 80% * 55A = 44A (I'm a little unclear on this point, actually.)

If using most other wiring methods, the #6 copper is good for 65A, no problem.

Cheers, Wayne

MikeD
Posts: 659
Joined: Thu Jun 24, 2010 6:14 am
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Leaf Number: 592

Re: 2019 Leaf

Thu Jul 19, 2018 10:24 am

wwhitney: Romex is most convenient for me so that's why I inquired about the availability of NM-B 4/2 since I recognized that 6/2 is inadequate under the NEC. I have noticed that 4/3 is available, but I haven't seen 4/2 mentioned (from Southwire, for example).

wwhitney
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Location: Berkeley, CA

Re: 2019 Leaf

Thu Jul 19, 2018 10:53 am

MikeD wrote:I have noticed that 4/3 is available, but I haven't seen 4/2 mentioned (from Southwire, for example).

Southwire's spec sheet for NM cable doesn't list 4/2 or 2/2 NM, so looks like they don't make it.

But you could use copper SE cable. Typically SER (round) is 3 conductors with ground, and SEU (flat) is 2 conductors with ground, although Southwire lists 2 conductor SER as well. Often the bare conductor is full sized, so for example 2 conductor #6 cable with #6 ground would be referred to as 6-6-6 SE. Sometimes the bare conductor is reduced two sizes.

Depending on the installation details and the year of NEC in force, SE cable can be used at its 75C ampacity, meaning #6 copper would be sufficient for a 60A circuit. Under the 2011 and 2014 NECs, this is allowed as long as the SE cable does not pass through thermal insulation. Under the 2017 NEC, all sizes of SE cable larger than #10 can be used at their 75C ampacity.

So if you can find it, 6-6-8 (or 6-6-6) copper SE cable would work for a 60A circuit, unless you need to run through thermal insulation and are under the 2011 or 2014 NEC. In which case you'd need 4-4-6 (or 4-4-4) copper SE cable.

Cheers, Wayne

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Nubo
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Location: Vallejo, CA

Re: 2019 Leaf

Thu Jul 19, 2018 11:57 am

johnlocke wrote:
Nubo wrote:
johnlocke wrote:...22KW charging could be 480VAC single phase as well but that tends to be an industrial voltage.


480V is 3-phase.

The voltage actually is 277 VAC/480 VAC Y configuration. 277 VAC phase to neutral. 480 VAC Phase to phase. Delta config is possible (no neutral) but is not commonly used.


OK I guess I was talking out my rear because I can't even tell if you're saying I'm wrong :lol:
I noticed you're still working with polymers.

johnlocke
Posts: 299
Joined: Fri Jan 08, 2016 3:47 pm
Delivery Date: 14 Dec 2015
Leaf Number: 300582

Re: 2019 Leaf

Thu Jul 19, 2018 8:40 pm

Nubo wrote:
johnlocke wrote:
Nubo wrote:
480V is 3-phase.

The voltage actually is 277 VAC/480 VAC Y configuration. 277 VAC phase to neutral. 480 VAC Phase to phase. Delta config is possible (no neutral) but is not commonly used.


OK I guess I was talking out my rear because I can't even tell if you're saying I'm wrong :lol:

You weren't wrong. I was simply pointing out that you don't have to use all three phases. In any case, to charge at 22KW you either need to convert 240VAC at 92A or 480VAC at 46A. 480VAC 3 phase is what the DCFC Stations use and is part of why they're so expensive.
2016 SV, New battery at 45K mi.
Jamul, CA
San Diego East County

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