I mean if you want to add a transformer to it you can do anything to want
with voltages. It doesn't provide you 120V from the service transformer.
Corner grounded Delta gives you a grounded 3 phase service (safer than
ungrounded) with one less wire than high-leg delta (3 instead of 4), making
it c
> Why couldn't 120V be derived from either of the 240V phase and the
> grounded corner via a 2:1 transformer?
It can. That's often how, say, an Edison base decorative luminary is run when
all other lighting is 277V (the ratios would of course be different). Otherwise
someone invariably screws a
On 1/4/22 7:43 PM, Patrick Finnegan via cctalk wrote:
It's the even more obscure corner-grounded delta, which requires even
more care and can't provide 120V power, since the phase to ground
voltage is 240V.
Why couldn't 120V be derived from either of the 240V phase and the
grounded corner via
> For what it's worth, the building I bought has two services installed when
> it was built in 1921 - single phase 120/240 for lighting loads, and 240V
> Delta for three phase loads.
I bet you have a fun electrical system :D
> It's the even more obscure corner-grounded delta
I love the reaction
On Tue, Jan 4, 2022, 18:15 Jonathan Chapman via cctalk <
cctalk@classiccmp.org> wrote:
>
> High-leg delta exists so you can have 120/240 lighting and appliance loads
> in a building that consumes mostly 3-phase, like a machine shop with an
> office. In most areas you aren't allowed to have more th
> High-leg delta is independent of open- or closed-delta.
That's correct.
> Open delta uses two single-phase transformers primaries connected to
> phases AB and BC.
A to C is also valid, presumably it's rotated if there's a lot of open delta in
an area (again, why?) to balance phases.
> On hig
On 1/4/22 12:15 PM, Jonathan Chapman via cctalk wrote:
> One of the top Google results:
>
> https://www.engineeringradio.us/blog/2012/02/the-open-delta-three-phase-service/
>
> Really really, there's only two pigs on the pole. And yet, delta power,
> though at a lower rating than transformer nam
One of the top Google results:
https://www.engineeringradio.us/blog/2012/02/the-open-delta-three-phase-service/
Really really, there's only two pigs on the pole. And yet, delta power, though
at a lower rating than transformer nameplate (vs. if you had three).
Thanks,
Jonathan
‐‐‐ Original
On 1/4/22 8:52 AM, Jonathan Chapman via cctalk wrote:
Indeed. This is not corner-grounded delta. Once you figure out open
delta, look at dog-leg.
I did some brief reading on open delta and now think that it requires
three lines, independent of ground. So I fail to see how open delta
would be
> I apparently need to do more reading.
Indeed. This is not corner-grounded delta. Once you figure out open delta, look
at dog-leg.
Thanks,
Jonathan
On 1/4/22 8:06 AM, Jonathan Chapman via cctalk wrote:
Yes, that's open delta. There are one or two small commercial buildings
here in town that still have open high leg delta service -- that's
240V delta, and one of the 240V transformers is center-tapped to give
120/240 split phase for small lo
> I have seen some roads where the utility has 2 of the phases plus
> neutral going down them, not true 2-phase power, but 2 phases 120/240
> degrees apart with the third phase just not present.
Yes, that's open delta. There are one or two small commercial buildings here in
town that still have o
On Sun, 2022-01-02 at 12:00 -0600, Grant wrote:
> Where are you getting two /different/ phases? -- Remember, the
> different legs on residential 120/240 wiring are really the same
> single
> phase.
>
> How do you get *two* /different/ phases without access to a *third*
> phase? There are onl
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