# Re: Repost RE: Explain 3 Phase

```Original poster: "davep by way of Terry Fritz <twftesla-at-uswest-dot-net>" <davep-at-quik-dot-com>

>      |---|   |---|   |---|                         ----------------------
> 0    |   |   |   |   |   |
>   ---|   |---|   |---|   |---                   0
>
>                                         OR
>   ---|   |---|   |---|   |---
> 0    |   |   |   |   |   |
>      |---|   |---|   |---|                      0
>
>                                                    ----------------------

errrrr
That's 180 out.
That's what a (two channel) scope will show
REFERENCE THE GROUND/NEUTRAL.
The 220 load is connected from line to line and sees the

On the right is NOT what will be seen.  Anywhere.
0--------------------
Adding the two voltages in the common home system yields
2220, rather than zero...

There is a hidden inversion in viewing the waveforms
REFERENCE THE assigned ground.

One has:

>      |---|   |---|   |---|
> 0    |   |   |   |   |   |
>   ---|   |---|   |---|   |---

>      |---|   |---|   |---|
> 0    |   |   |   |   |   |
>   ---|   |---|   |---|   |---

>      |---|   |---|   |---|
>      |   |   |   |   |   |
> 0    |   |   |   |   |---|
>      |   |   |   |   |   |
>   ---|   |---|   |---|   |---

So the two 110s add to 240....
Which, we know, is what happens.

ALL that is necessary is to recall that the ground being in the
center leads to an 'invisible' inversion in one leg.

(I have watched an entire computer companies electronic
hobbiest group get Just This Snarled on this issue.

Just keep reminding:
Adding out of phase yields zero.