Negative 48VDC (-48V), or positive grounded, was selected for use by Bell when it was found to be superior to positive voltage. It prevents electrochemical reactions from destroying buried copper cables and. Contact online >>
Negative 48VDC (-48V), or positive grounded, was selected for use by Bell when it was found to be superior to positive voltage. It prevents electrochemical reactions from destroying buried copper cables and...
But unlike traditional 12 and 24 volt systems which have the minus (-) side of the battery connected to ground (i.e. called negative ground systems), telecom batteries have the plus (+) side of the battery connected...
No shortage of questions "Is my car positive or negative ground?" Confusing because The industry was never consistent. Model T vs A was swapped.
A Dodge Brothers post I found said they were different north or south of the Canadian border for the same year.
The manufacturers did what they did, but is there an engineering reason?
Electrons flow from negative to positive.but does one ground or another; give more amps? Charge easier? Give a hotter spark?
Voltage certainly affects amperage draw and wire size.But Is there any science or performance reason why they would select one ground or the other?
However, manufacturers often make their products just different enough to force their customers to buy parts only from the OEM.
Electrons flow from negative to positive.but does one ground or another; give more amps? Charge easier? Give a hotter spark?
You are right on, maybe, spark fires easier (less voltage required) when the spark plug center tip fires to the larger "ground" electrode. So, ignition systems (well, that I know of) had the center electrode be negative with respect to the shell of the plug, until HEI came along with enough volts to overcome that issue and now Buick has sold waste spark engines [where a pair of plugs/cylinders fire together so one is reverse polarity of the other], (along with other manufacturers) for over 30 years.
That means the center tip of the spark plug was negative with respect to the threaded part, i.e. positive ground. Now, you can have that polarity stay the same and change the primary polarity, but I guess some manufacturers liked all the circuits to have the same polarity and made the primary (battery side) positive ground.
Makes no sense from an electron''s view. And not my experience with my vehicles.
positive ground vehicles batteries ALWAYS lasted much longer than the negative ground ones.
Other than that I don''t know any difference. Which I suppose is why some did one way, some the other.
At some point in my past I recall a mention of current flow causing rust. Maybe at ground points?
Free electrons are required for the oxidation chemistry that leads to rust. That''s why a sacrificial anode works (the zinc in the anode soaks up the free electrons even more eagerly than iron atoms do, and the zinc corrodes instead of your sheet metal. Not just at ground points.
That''s why a sacrificial anode works (the zinc in the anode soaks up the free electrons even more eagerly than iron atoms do, and the zinc corrodes instead of your sheet metal.
I guess if you sink your car in water or moist dirt for the electrons to flow then a sacrificial anode would be helpful, but on dry land, no. There needs to be current flow through the zinc to work.
Yes there is a logical reason why cars switched to negative ground.
And it''s all to do with setting a standard by which all manufacturers could follow. It was driven by the Japanese starting in the late 1940s to early 1950s and the development of the huge electronics industry in Japan. And in turn the development of semiconductors. A standard was introduced where all electronic devices would use a negative ground. TV and radio manufacturers accepted the standard early. By the mid 1950s the automotive industry was dragged into using the standard which would allow more electronic creature comforts (like hifi radio) to be fitted to cars.
It really doesn''t have anything to do with current flow or sacrificial anodes.
As a side note: electrons flow from negative to positive, but conventional current flows from positive to negative.
Actually, electrons do not "flow" at all. Picture a line of people. Person #1 punches #2, #2 punches #3, #3 punches #4 and so on down the line.
Correct, I was using the sacrificial anode as an explanation to 31Nash880''s question about rust, not suggesting they should be installed on our cars. However, I have wondered why folks in the rust belt don''t bury one (the anode, not the car!) in their yard, and run a cable to the garage to hook to the car when parked. Too much trouble for a cheap driver, perhaps, but for a special vehicle, it would probably help.
In 47 years as a practicing electrical engineer I''ve heard several theories, but have never seen any definitive data to support one way or the other. The corrosion idea MAY have some merit, but obviously isn''t a definitive reason or we''d still all be positive ground...remember, the "ground" on an automobile has nothing to do with the physical earth, but is nothing more than a reference point, and electronics can be made to work properly with the reference wherever you want it to be.
There'' a lot to be said for standardization, and in this case I suspect the advantages of standardization overwhelmed whatever technical reasons there may or may not have been.
Standardization of grounds is a good thing. Guess there was no reason for one or the other than some engineers flipping a coin.
Especially the swap between the Model T and A. I wonder if that was Henry''s choice? Or maybe an engineer from a positive ground company came in and joined the design team?
As noted below: Cadillac using positive ground while other GM used negative seems wasteful.
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