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If you are talking about the type of power you would find in a house or shop, it is the wiring of 2 or more "hot" lines with the AC peaks timed so that the current peaks of each line are spaced equally apart.

3 phase power has 3 alternating current lines that peak 120 degrees apart.

Here is a "how it works" page about 3 phase power.

http://science.howstuffworks.com/power3.htm

Here is a little better page that explains why 3P is better for industrial applications.

http://www.woodweb.com/knowledge_base/When_is_threephase_power.html

Later, mikey
 

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Discussion Starter · #3 ·
I think I've got idea now. How do I go about wiring single phase compressor to dual phase outlet (for dryer) Do I just use one of the phases and isolate 2nd phase off?
 

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There are (2) types of electrical phase configurations normally used.

Single Phase and 3 phase.
2 phase is obsolete but some old equipment is still available.

3 phase is used to transmit and distribute power throughout the power grid and in commercial and industrial applications.

Single phase is for residential and light commercial uses.

Single phase power can be easily derived from 3 phase sources.
To derive 3 phase power from Single phase requires a phase converter.

The (electric) dryer outlet is Single phase, 3 wire. This means that the voltage is 120/240 volt 30 amp. 3 wire being the (1) neutral (white) wire and (2) hot wires (black and red).

The compressor is Single phase but you need to know the voltage and amperage of the motor to correctly and safely wire it.

Post the motor nameplate ratings. The circuit requirements are usually clearly indicated on this appliance.

vicrod
 

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Discussion Starter · #5 ·
It says FLA 16 , whatever FLA stands for. Breaker size 30 amp (all the circuits are already wired through breakers in garage circuit board) Voltage 230V 1ph
 

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a phase is a compleate sign wave ( pully positive then fully negative of A/C current, if you had a osciliscope and was reading am alternator output with it, without diodes ( 3 phase pure A/C ) you would see 3 compleate sign waves overlapping on the screen. same would go for home/ commercial 230v wiring.
 

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the dryer outlet is 1ph 230v... it could be a 3 or 4 wire recept though. newer homes have the neutral and ground seperate, but most older homes are 3 wire. If your recept has 3 slots it's 3 wire if it has 4, it's 4 wire.

All you need is one of these
http://www.acehardware.com/search/index.jsp?kwCatId=&kw=dryer cord&origkw=dryer cord&sr=1
one of these
http://www.acehardware.com/product/...geBucket=0&parentPage=family&searchId=1304371
one of these(knockout in the center not necessary)
http://www.acehardware.com/product/...geBucket=0&parentPage=family&searchId=1304371
a couple of these
http://www.acehardware.com/product/...58.1304376&parentPage=family&searchId=1304376
and some wirenuts and a ground screw.

Just put the end of the dryer cord and the end of the compressor cord in the box through the clamp connectors. clamp them down, put a ground screw in the box and wrap one of the ground wires around it so there is still a long part coming off, then wirenut the 2 grounds together, wirenut the 2 neutrals together(if it's 4wire, if it's 3wire it's same as ground) then wirenut the 2 pairs of hots together. put the blank cover on the box, and you're all set.
 

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The dryer outlet is 1ph 230v 30a... It could be a 3 or 4 wire recept though. Newer homes have the neutral and ground seperate, but most older homes are 3 wire. If your recept has 3 slots it's 3 wire if it has 4, it's 4 wire.

All you need is one of these
http://www.acehardware.com/search/index.jsp?kwCatId=&kw=dryer cord&origkw=dryer cord&sr=1
one of these
http://www.acehardware.com/product/...geBucket=0&parentPage=family&searchId=1304371
one of these(knockout in the center not necessary)
http://www.acehardware.com/product/...geBucket=0&parentPage=family&searchId=1304371
a couple of these
http://www.acehardware.com/product/...58.1304376&parentPage=family&searchId=1304376
and some wirenuts and a ground screw.

Just put the end of the dryer cord and the end of the compressor cord in the box through the clamp connectors. Clamp them down, put a ground screw in the box and wrap one of the ground wires around it so there is still a long part coming off, then wirenut the 2 grounds together, wirenut the 2 neutrals together(if it's 4wire, if it's 3wire it's same as ground) then wirenut the 2 pairs of hots together. Put the blank cover on the box, and you're all set.

btw, it's "sine" wave, not "sign" wave ;)
 

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mitmaks said:
It says FLA 16 , whatever FLA stands for. Breaker size 30 amp (all the circuits are already wired through breakers in garage circuit board) Voltage 230V 1ph
FLA is full load amps, the maximum the motor can can draw in amps under normal operation. There is another acronym in industrial use, it is LRA locked rotor amps. In residential use it is not used.

Vince
 
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