Stupid Question...

[idleup]

Is -12v the same as ground? I am looking at my Gretz GA-1000 Heated Pitot wiring and it shows -12v and +12v...

[RV10inOz]

If you ask me it should be called ZERO VOLTS as the GND and 0v are tied together the potential between the airframe and the NEG/GND is supposed to be 0v.

Thus the airframe is GND and the battery -ve terminal is 0v and the other terminal is +12v or +24v in some systems.

you should not have -12v as the terms suggests that you could have a real -12v and that would mean 24v to the +12v.

Maybe I am wrong here.....but Ov and 12v or 0v/24VDC is what we use in the industrial world.

[Jeff A]

Not the best terminology, but in this case, yes -12v is the same as ground. Read the last line of page 1 and the first 2 lines of page 2. It clearly states -12v going to ground.

http://www.angusaviation.com/LinkCli...edownload=true

[idleup]

Thanks guys.

[jim plaster]

Check me if i'm wrong here ....but the only stupid question is the one that's never asked! Don't be afraid to ask here,we all have at one time or another!

[idleup]

Yea, what confused me is that I have always learned that negative voltage is very different than ground and ground should not be designated like that