- #1
J Mc
- 7
- 2
Hi,
I'll start by offering some context to my question. I am a mechanic by trade, and have a bachelor of technology in motorsport engineering. I have a friend who is an electrician by trade, and he likes to work on his car in his spare time. In my line of work I only deal with 12V/24VDC, negatively earthed vehicles, and use the common vernacular of positive(+) and negative(-)/earth/ground, in reference to the electrical system, such as the markings on a battery. In my friends line of work, he deals with AC circuits, and uses the vernacular of active, neutral, and earth, in reference to household power outlets or wall sockets.
My question stems from an occasion when we were working on his car, trying to troubleshoot an electrical fault. When testing a standard relay, he stated that it was switching to neutral, where as I would say that it was switching to Earth or ground(So when active, the relay completed the circuit between the component and the negative terminal of the battery). I'd never heard of the negative or return wire, in a DC circuit, referred to as neutral, so I told him that he was in error referring to negative as neutral. He disagreed.
He proceeded to draw a 2 phase AC waveform, where the second phase was shifted 180 degrees so that it showed that the first phase and second phase were in opposite poles, and were effectively neutralising each other. He also stated that, electrically speaking, a neutral wire or terminal has no potential voltage, or has balanced charges. That all made sense, and i could accept the reason it was called neutral.
I would argue, that in a car, in which the power is supplied by an alternator with 3 phase rectification, that the alternators circuitry only allows the peaks of the positive poles of the AC generated to enter the electrical system. In my mind, without the opposing negative poles being admitted to the system, that no neutralisation occurs, hence making the term 'neutral' not applicable to this application.
Is this just a matter of each of us just using the vernacular of our fields to describe the same thing, or do I have a point? Or is it more complicated? Have I got it all wrong?
Apologies for the length and complexity of the explanation for what is essentially a simple question, and also for the Queens English, but I'm Australian. Hope that doesn't put anyone off.
Thanks in advance for any help provided.
Regards,
J Mc
I'll start by offering some context to my question. I am a mechanic by trade, and have a bachelor of technology in motorsport engineering. I have a friend who is an electrician by trade, and he likes to work on his car in his spare time. In my line of work I only deal with 12V/24VDC, negatively earthed vehicles, and use the common vernacular of positive(+) and negative(-)/earth/ground, in reference to the electrical system, such as the markings on a battery. In my friends line of work, he deals with AC circuits, and uses the vernacular of active, neutral, and earth, in reference to household power outlets or wall sockets.
My question stems from an occasion when we were working on his car, trying to troubleshoot an electrical fault. When testing a standard relay, he stated that it was switching to neutral, where as I would say that it was switching to Earth or ground(So when active, the relay completed the circuit between the component and the negative terminal of the battery). I'd never heard of the negative or return wire, in a DC circuit, referred to as neutral, so I told him that he was in error referring to negative as neutral. He disagreed.
He proceeded to draw a 2 phase AC waveform, where the second phase was shifted 180 degrees so that it showed that the first phase and second phase were in opposite poles, and were effectively neutralising each other. He also stated that, electrically speaking, a neutral wire or terminal has no potential voltage, or has balanced charges. That all made sense, and i could accept the reason it was called neutral.
I would argue, that in a car, in which the power is supplied by an alternator with 3 phase rectification, that the alternators circuitry only allows the peaks of the positive poles of the AC generated to enter the electrical system. In my mind, without the opposing negative poles being admitted to the system, that no neutralisation occurs, hence making the term 'neutral' not applicable to this application.
Is this just a matter of each of us just using the vernacular of our fields to describe the same thing, or do I have a point? Or is it more complicated? Have I got it all wrong?
Apologies for the length and complexity of the explanation for what is essentially a simple question, and also for the Queens English, but I'm Australian. Hope that doesn't put anyone off.
Thanks in advance for any help provided.
Regards,
J Mc