[Milsurplus] Aircraft electrical system question

[Bob Camp]

Hi

At least on the gear I have seen, yes, the negative return on the 24V aircraft electrical system was through the frame of the aircraft. It’s the same idea 
as in a automobile. Less wire, less weight, lower impedance ground. The telephone guys do it “backwards”. On a 48V circuit, the positive is what is grounded
rather than the negative. The idea there is to reduce galvanic (electroplating) corrosion on the buried wires. 

Bob

> On Dec 20, 2015, at 11:17 AM, <antqradio at sbcglobal.net> <antqradio at sbcglobal.net> wrote:
> 
> Was one of the 24 volt aircraft battery terminals grounded to the frame as in cars?  Same question applies to the 115 volt, 400 cycle three phase distribution system, was one leg grounded through a center tap on one stator winding?
> 
> I am setting up a 24 power supply using 12 volt router power supplies.  They are pretty cheap on eBay, going for $10 or less for 400 to 1800 watt examples and that is including shipping.  In the particular supplies I have, the negative 12 volt terminal is grounded to the 60 cycle AC plug ground terminal.  I have already removed the ground on one power supply so that it an be stacked to get 24 volts and wonder if I should do the same to the other so that the 24 volt supply is floating with respect to 60 cycle power ground.  Thoughts?
> Jim
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