WetEV
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Re: How many amps for new 240V install?

Tue Jan 21, 2020 8:33 am

Oilpan4 wrote:
Tue Jan 21, 2020 1:26 am
Aluminum wire inside an inhabited structure?
Hell no.
The wires from the street into the breaker box are often aluminum. That is in an inhabited structure. There are 100 million houses done that way, and these wires don't cause problems. Aluminum can be safe if done correctly.

There were millions of houses built with interior aluminum wiring not done correctly. A few burnt down. That's a good reason to be very shy of aluminum wiring, especially in houses built in the 1960's and 1970's. But a new house? I'd be skeptical, but would consider it. Show me the test data. Show me houses built with this technology that have been around for a decade or more.
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Oilpan4
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Re: How many amps for new 240V install?

Tue Jan 21, 2020 12:03 pm

Yeah I crimp live service drops. They're aluminum from the transformer to the house. Normally from the weather head into the house is copper.
From the weather head to the panel is one of the few places aluminum can be properly installed in a home since one end is crimped and the other end is in big screw terminals.
The inspectors in Texas and new Mexico don't like aluminum.
They get out their book and start doing calculations and looking at everything closer.

The ultimate guide is "reducing fire hazards in aluminum wired homes"
Last update was 2014 and I believe it's still ongoing.

I read another report that said a homes electrical wiring was something like 50 times more likely to reach a fire hazard condition if it had aluminum branch circuits.

All I know is I have seen a large portion, up to half of aluminum wired homes have some burned wires.

The worst is aluminum wire with a zinsco panel. Those zinsco breakers act more like on off switchs then breakers.
Last edited by Oilpan4 on Wed Jan 29, 2020 1:30 pm, edited 1 time in total.
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goldbrick
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Re: How many amps for new 240V install?

Tue Jan 21, 2020 3:58 pm

Just to be clear, if I do use Al cable for my garage sub-panel, it will be used from the breaker in the main panel to the sub-panel lugs. Both sides are clearly rated for use with Al. I'm pretty careful about this kind of stuff. Eg. all the receptacles in my house have been replaced with 'spec grade' ones and ALL the 120V breakers in the panel are AFCI or GFCI/AFCI.

wwhitney
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Re: How many amps for new 240V install?

Tue Jan 21, 2020 9:37 pm

Oilpan4 wrote:
Tue Jan 21, 2020 12:03 pm
I read another report that said a homes electrical wiring was something like 50 times more likely to reach a fire hazard condition if it had aluminum branch circuits.
Do not conflate the performance of circa 1970 AA-1350 aluminum wiring with the performance of modern AA-8000 series aluminum wiring.

Cheers, Wayne

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Re: How many amps for new 240V install?

Wed Jan 22, 2020 7:42 am

I don't believe 8000 series alloy can be purchased for branch circuits.
Even if it could I wouldn't use it.
I don't think aluminum wire smaller than 6 gauge can be purchased for use in residential wiring.
So even if you bought and used aluminum wire in a modern house it would be on a dedicated circuit that starts in the panel and ends at a single receptacle with big screw terminals. No splices, no multi wire junctions, no wire nuts, ect.
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wwhitney
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Re: How many amps for new 240V install?

Wed Jan 22, 2020 9:10 am

Oilpan4 wrote:
Wed Jan 22, 2020 7:42 am
I don't believe 8000 series alloy can be purchased for branch circuits.
Even if it could I wouldn't use it.
I don't think aluminum wire smaller than 6 gauge can be purchased for use in residential wiring.
So even if you bought and used aluminum wire in a modern house it would be on a dedicated circuit that starts in the panel and ends at a single receptacle with big screw terminals. No splices, no multi wire junctions, no wire nuts, ect.
Close, the smallest you can typically get is #8 aluminum. You can use that for branch circuits, but as you say they would likely be individual branch circuits. Which is what the OP was about, an individual branch circuit for an EVSE. For which aluminum is a fine choice, unless you are hardwiring the EVSE and its spec sheet says "copper conductors only."

Cheers, Wayne

roger1818
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Re: How many amps for new 240V install?

Wed Jan 29, 2020 9:43 am

smkettner wrote:
Sun Jan 19, 2020 4:20 pm
Unless you are a super commuter 30 amp circuit and 24 amp EVSE is plenty 99% of the time.
Get 40 or 50 if you like but I would rather have 2x 30 amp for two vehicles.
If going 60+ then put it to a subpanel to split the power between multiple EVSE etc.
IMHO, I would rather one 40 or 50A circuit with two 32 or 40A Power Sharing Electric Vehicle Charging Stations. That gives you the flexibility to quickly charge one car or divide the power between both cars. It would also likely be cheaper than having separate circuits.

The sub-panel route is another good option (especially if you think you may want to have 3 or more charging stations), though in some cases it might be easier to have a main panel in the garage, and make the existing panel for the rest of the house a sub-panel.
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goldbrick
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Re: How many amps for new 240V install?

Wed Jan 29, 2020 11:33 am

I would rather run dedicated lines to each EVSE rather than splicing the wires to multiple EVSE's. There are probably ways to do the splice that is up to code but IMHO, it would be much simpler to run a separate circuit to each EVSE. And in that case, having a sub-panel nearby makes the job much easier.

I'm planning to put a sub-panel in my garage due to some factors that are unique to my situation. I don't plan to install more than one EVSE but if I ever did, the sub-panel should handle it easily. In the mean time, I have some other circuits that need to be updated and that will be much easier with a sub-panel in the garage.

roger1818
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Re: How many amps for new 240V install?

Wed Jan 29, 2020 11:48 am

goldbrick wrote:
Wed Jan 29, 2020 11:33 am
I would rather run dedicated lines to each EVSE rather than splicing the wires to multiple EVSE's. There are probably ways to do the splice that is up to code but IMHO, it would be much simpler to run a separate circuit to each EVSE. And in that case, having a sub-panel nearby makes the job much easier.
To each his own. I would prefer the flexibility offered by Power Sharing for the one time cost of making sure the wiring and configuration are done right (yes, the code does permit this configuration), as I can envisage situations where being able to charge one vehicle faster than the other would be useful.
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goldbrick
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Re: How many amps for new 240V install?

Wed Jan 29, 2020 12:48 pm

How do the Power Sharing EVSE's communicate with each other? Is this a dual plug EVSE that has only 1 connection to the power source and then divides the power between them? Is one of these units cheaper than 2 separate EVSE's? or just more convenient?

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