Oilpan4 wrote:Virtually no one wires up room outlets for continuous high amp use.
Oh and if some amateur wired the receptacles with the "back stab" method there will be a fire.
I just read about 'backstabbed' outlets, and they sound dangerous. But will
there be a fire?
Much of these discussions surround the notion of what makes a wise decision, given that opposing decisions have alternate risks. In an earlier post, you gave some figures involving the risk that blown-in cellulose insulation would create a fire hazard: that 16 amps on 14-gauge wire running continuously could push the cellulose toward its temp rating of 60 degrees Celsius.
How do you arrive at these figures? Have you actually done thermal calculations with the physical properties of cellulose to determine the probability of a fire? I only took a few basic physics courses, but I would be interested to further research your claims.
The only reference I found to the temp ratings of various types of insulation are here:https://www.engineeringtoolbox.com/insulation-temperatures-d_922.htmlhttps://en.wikipedia.org/wiki/Insulation_system#cite_note-IEC60085-3
None of the ratings shown go as low as 60 degrees Celsius. I'm also reading that cellulose is treated with fire-retardant material, making it safer for use around electrical wires.
Somehow, I think you would have to arrive through thermal calculations at the probability of a fire
, and incorporate that probability into a further calculation involving the probabilities of other expected outcomes and their relative magnitudes of favorability (air pollution, ozone damage). While favorability isn't as easily measured as the likelihood of a fire or of health hazards due to air pollution, I think some kind of cost-benefit analysis would have to weigh in before we could automatically dismiss home-charging on a room circuit as unwise.
Again, this is for one
car. I did some research and found that the upper wattage limit for a 12-volt, 14-gauge wire is 2400 watts, which is well above the 1300 used by my EVSE. Although two cars charging at once would not work (1300 + 1300 = 2600 > 2400), I still like my idea of putting each charge port on a timer (say, 7:00 PM - 11:00 PM, 11:00 PM - 3:00 AM, 3:00 AM - 7:00 AM), to ensure that 1300 watts is never exceeded.
As a competitor to the idea of host charging, however, see below...
Quothmar wrote:If not by host charging, how would you say that we should get apartment complexes to make it practical for residents to own electric vehicles?
Installing EVSEs in the parking areas for residents only. L2 240V/208V, hourly limit, dual cord units would probably be best. One for every N units, with N being perhaps 5, more or less. 4 hour limit during the day, perhaps 8 hours or a bit more overnight.
Or in more expensive apartments, for a unit only, perhaps in a garage, perhaps with a separate rental agreement.
And/or charging at work.
A problem that will need to be solved once the percentage of EVs gets up to near 50%.
At first, I was skeptical that EVs could ever get up to 50% without allowing apartment-dwellers to charge their EVs at home. Oddly enough, I never bothered to do the research to see that roughly 3/4 of the United States population live in houses. I imagined that apartments were more 'compact' and that there would be more people living in them. But if more people live in houses, then putting more responsibility on house-owners to purchase electric vehicles, until EV-driving house-owners reach a certain percentage of the population, and then mandating that charging stations be installed at apartment complexes, could work.
So host charging would not be necessary
to get the ball rolling for apartment complexes, though it may nevertheless be a viable supplementary strategy.