"Trent" <[email protected]> wrote in message
news:[email protected]...
>I am looking at purchasing the Powermatic 2000 tablesaw, but I am not
> sure of the difference between 1 phase and 3 phase. The descriptions
> both say they are 5 HP. My shop is currently wired with 240v, 20 amp
> and 30 amp plugs.
>
> Thanks.
>
> Trent
Typical residential power in the USA is single phase. If your shop is in a
commercial building you may have three phase. Do you have any 4 pole outlets
mounted anywhere? If you do you probably have three phase power.
Greg
<[email protected]> wrote in message news:[email protected]...
> On Sat, 17 Nov 2007 23:21:28 -0600, "Greg O" <[email protected]>
>
>>
>>
>>Typical residential power in the USA is single phase. If your shop is in a
>>commercial building you may have three phase. Do you have any 4 pole
>>outlets
>>mounted anywhere? If you do you probably have three phase power.
>>Greg
>>
>
>
> Actually, you typically have 2 phase power into residence. 120 V on
> two legs of a 3 phase system. This allows you to run phase to phase
> (208V) like on some electric heaters, or 240V (120 x2) for an electric
> stove. Depending on location, you can get the third wire to give
> you 3 phase, but be prepared to pay the big bucks.
>
> If the shop is 'residential' there will likely only be 2 phase power
> and you can confirm this my looking at how many wires enter the mast
> just before the meter on the building. 3 wires is 2 phase (2
> power-one common)
>
> Pete
Around here residential is single phase. Line to line is 240 volt, line to
neutral is 120 volt.
I have never heard of what you describe in a residential setting. I question
if you are certain about what you describe. How do you get 208, and 240 out
of one service, never seen it without additional transformers. 208 volt 3
phase will get you 120 to neutral. We see it all the time in commercial
buildings. We used see some 240 3 phase commercially, but it seems to have
been replaced with 208 3 phase.
Greg
On Sat, 17 Nov 2007 23:21:28 -0600, "Greg O"
<[email protected]>
>> Actually, you typically have 2 phase power into residence. 120 V on
>> two legs of a 3 phase system.
Single phase, center tapped.
>
> If the shop is 'residential' there will likely only be 2 phase power
> and you can confirm this my looking at how many wires enter the mast
> just before the meter on the building. 3 wires is 2 phase (2
> power-one common)
>
Single phase power. Two hot legs from a transformer and a center tap which
you tie to ground in your panel.
--
-Mike-
[email protected]
On Sat, 17 Nov 2007 23:21:28 -0600, "Greg O" <[email protected]>
>
>
>Typical residential power in the USA is single phase. If your shop is in a
>commercial building you may have three phase. Do you have any 4 pole outlets
>mounted anywhere? If you do you probably have three phase power.
>Greg
>
Actually, you typically have 2 phase power into residence. 120 V on
two legs of a 3 phase system. This allows you to run phase to phase
(208V) like on some electric heaters, or 240V (120 x2) for an electric
stove. Depending on location, you can get the third wire to give
you 3 phase, but be prepared to pay the big bucks.
If the shop is 'residential' there will likely only be 2 phase power
and you can confirm this my looking at how many wires enter the mast
just before the meter on the building. 3 wires is 2 phase (2
power-one common)
Pete
On Nov 17, 10:03 pm, Trent <[email protected]> wrote:
> I am looking at purchasing the Powermatic 2000 tablesaw, but I am not
> sure of the difference between 1 phase and 3 phase. The descriptions
> both say they are 5 HP. My shop is currently wired with 240v, 20 amp
> and 30 amp plugs.
>
> Thanks.
>
> Trent
if you don't know what 3 phase power is I'd say it's a safe bet you
don't have any. get the single phase machine.
<[email protected]> wrote in message news:[email protected]...
> On Sat, 17 Nov 2007 23:21:28 -0600, "Greg O" <[email protected]>
>
>>
>>
>>Typical residential power in the USA is single phase. If your shop is in a
>>commercial building you may have three phase. Do you have any 4 pole
>>outlets
>>mounted anywhere? If you do you probably have three phase power.
>>Greg
>>
>
>
> Actually, you typically have 2 phase power into residence. 120 V on
> two legs of a 3 phase system. This allows you to run phase to phase
> (208V) like on some electric heaters, or 240V (120 x2) for an electric
> stove. Depending on location, you can get the third wire to give
> you 3 phase, but be prepared to pay the big bucks.
>
> If the shop is 'residential' there will likely only be 2 phase power
> and you can confirm this my looking at how many wires enter the mast
> just before the meter on the building. 3 wires is 2 phase (2
> power-one common)
>
> Pete
Um, no. In the US, residential electric service is almost exclusively
single phase. By tapping the secondary on the (single phase) transformer
appropriately, you get two hot legs that are 180 degrees out of phase w.r.t.
each other, plus a neutral. Hot-to-hot = 240V, hot-to-neutral = 120V.
todd
In article <[email protected]>,
"Greg O" <[email protected]> wrote:
> "Trent" <[email protected]> wrote in message
> news:[email protected]...
> >I am looking at purchasing the Powermatic 2000 tablesaw, but I am not
> > sure of the difference between 1 phase and 3 phase. The descriptions
> > both say they are 5 HP. My shop is currently wired with 240v, 20 amp
> > and 30 amp plugs.
> >
> > Thanks.
> >
> > Trent
>
>
> Typical residential power in the USA is single phase. If your shop is in a
> commercial building you may have three phase. Do you have any 4 pole outlets
> mounted anywhere? If you do you probably have three phase power.
> Greg
You are looking for a receptacle that looks something like this in the
building to indicate you have 3 phase power -
http://www.drillspot.com/products/124328/HUBBELL_HBL4100R9W_Pin-Sleeve-Re
ceptacle
If you do not have any outlets that take a 4 pin cord, you probably do
not have 3 phase power available. If you have overhead wiring - count
the number of wires that run from the pole to the building - if it is
not at least 3 coated wires (typically black) then you do not have 3
phase power. If you are in a residential neighborhood you probably do
not have 3 phase power.
My utility charges by the mile from the end of the feeder to the home
for 3 phase power to be installed - believe me you do not want to know
the price.
If you need 3 phase power there are motor-generator sets available that
will convert 1 phase to 3 phase. A good place to look (not to buy - I
have never worked with them) at the specs for phase converter systems is:
http://www.phaseconverter.com/
Doug
Trent wrote:
> I am looking at purchasing the Powermatic 2000 tablesaw, but I am
> not
> sure of the difference between 1 phase and 3 phase. The descriptions
> both say they are 5 HP. My shop is currently wired with 240v, 20 amp
> and 30 amp plugs.
If you don't have three phase power you can't use a three phase tool
(at least not without going to a lot of extra work). If you don't
know whether you have three phase then it's almost certain that you
don't.
--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
[email protected] wrote:
> On Sat, 17 Nov 2007 23:21:28 -0600, "Greg O"
> <[email protected]>
>
>>
>>
>> Typical residential power in the USA is single phase. If your shop
>> is in a commercial building you may have three phase. Do you have
>> any 4 pole outlets mounted anywhere? If you do you probably have
>> three phase power.
>> Greg
>>
>
>
> Actually, you typically have 2 phase power into residence. 120 V on
> two legs of a 3 phase system.
The two legs of a residential system are 180 degrees out of phase, the
three legs of a three-phase system are 120 degrees out of phase.
> This allows you to run phase to phase
> (208V) like on some electric heaters, or 240V (120 x2) for an
> electric
> stove.
A "208V" electric heater runs on the same voltage as a "240V" electric
stove. If you think otherwise, show us how the two are wired
differently.
> Depending on location, you can get the third wire to give
> you 3 phase, but be prepared to pay the big bucks.
You're getting 3 additional wires to get 3-phase.
> If the shop is 'residential' there will likely only be 2 phase power
> and you can confirm this my looking at how many wires enter the mast
> just before the meter on the building. 3 wires is 2 phase (2
> power-one common)
>
> Pete
--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)