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Yes, a #10 copper conductor with an insulation factor of 75 and 90 degrees C are both rated at 30 amps.

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Q: Is it safe to use 10-3 wire at 30a breaker?
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Can you safely change a 30 amp breaker to 20 amps?

No, this is not a recommended procedure. The breakers main job is to protect the wire that is connected to it. A 20A breaker will have a #12 wire (rated 20A) connected to it. A 30A breaker will have a #10 wire (rated 30A) connected to it. As you can see if you use a 30A breaker on a #12 wire you could overload the wire by 10 amps. I have seen an incident where the insulation has melted off of an overloaded wire, the wire short out and a fire start before the bigger size breaker tripped. DON'T DO IT.


What breaker do you use for 10-2 wire?

Assuming a 120V circuit then a 30A Single Pole. For a 240V circuit an 30A two pole. Of course anything smaller that a 30A is acceptable. 30A is the maximum allowed.


If you install a 30A 240V GFI breaker will this be ok or will the cycles the dryer has prematurely fail the breaker?

I suspect you mean GFIC breaker. The dryer will not cause the breaker to fail.


Can 110V circuit with 2 wire size of 10 and a ground be converted to 220V after changing the outlet and breaker?

It depends on the amount of current (Amps) your breaker is rated for. If you boost your voltage the current will go down proportionally. 10 guage wire has an allowable ampacity of 30A. so if you are not drawing more than 27A you should be ok.


How do you upgrade the service from a 120V 100A circuit breaker to 240V 30A for appliances like ovens and dryers?

Have an electrician wire you a proper line for the appliance. You were just kidding about the 100A, right? 10, or 20amp, not 100.


Does a double-pole 30A breaker pull 15A per leg and if so why can't 14 gauge be used since 14 is rated for 15A?

A double pole 30 amp breaker can pass 30 amps per pole, therefore #10 wire should be used.


Is 10-3 wire heavy enough for a washer-dryer combination if they are 50 feet away from the breaker box?

10/3 will be fine if its not more than 75 feet Assuming they draw 30A or less, yes.


Do you need to use some type of mini breaker panel with a single 15A circuit breaker to connect a 15A receptacle into a 30A line?

To be short...Yes


Can you run 8 gauge thhn wire for 30a circuit?

yes


Will a 20A 240V breaker be sufficient for a 240V 22A input welder or do you need to go to a 30A?

It would have to be a 30 amp breaker to use the full power of the welder. I'd say go with the 30A. The general rule is that your planned load should only be 80% of the circuit capacity. That means a 30A circuit should have a maximum load of of (30*0.8) = 24A. With the 30 amp breaker you must have at least #10 wires feeding the circuit.


What is the US equivalent of European 4x2.5 sq mm HO7RN-F and could US 10 2 be substituted for the European cable to hardwire a 240V 27A appliance?

If you want an American plug to power a 30A 220V device look at a dryer outlet. It will have an extra neutral conductor, but it is standard. Otherwise, you can go with a 220V 30A TwistLok plug. All the home centers [I've been to] carry these plugs. 10ga wire is heavy enough for 30A runs under 75ft, though for a 27A appliance you should consider a 40A breaker with 8ga wire.


How do I wire a single phase 120 amp 230 volt flux and mig welder to a 200 amp panel?

It is very likely that the 120A current you quote is the output current. Check your Welder Box and look at the input current. It is likely around 30 Amps. To wire a 30A circuit you will need 10 gauge wire and it is likely 3 conductots + ground. You will need a 230V Breaker. Connect the black and red wires from the 10 gauge cable to the breaker, white wire to neutral and ground to ground.