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.
if i have a breaker that has a 120/240v and my dryer has a 240v plug can i change the receptacle to a 240v
The voltage is correct, BUT, Your welder is going to draw more current than the pool pump did. The breaker, wiring, and the receptacle will have to be upgraded. In my opinion I have never seen a "temporary" connection!! ...pkazsr
For a 7000watts or 7kw a 240V then it is 30 Amp
Simple answer is yes. But you need to first determine if your breaker can handle it, not just because you have an empty slot. You have to total up amps being used and check rating for your box. If it can handle it then it is a sinch to install
Yes, because you will be able to maintain current flow between phases.
I suspect you mean GFIC breaker. The dryer will not cause the breaker to fail.
10/3 with ground NM.
At 240V it can support 7200W
In America, a 2-pole breaker is controlling 240V. 120V per leg.
Yes it will operate it fine.
Assuming a power factor of 0.85, at 240V 3 phase, 15KW load would draw a full load of 42.5 Amps. 50 Amp rating breaker will be suitable.
A single pole 15 amp breaker can only be setup for 120v. You need a double pole 15 amp breaker, which looks like two 15a breakers attached with a bar across the two actuators. Each leg provides 120v, or in the case of your breaker, 240v across the two legs.
Well, maybe. What is the current rating on the spa circuit? What is the current rating on the welder? If the welder is larger than the outlet, then no. It must be the other way around. If the current ratings are OK, then yes. Your welder doesn't need 110V so it doesn't connext to neutral. Connect the hot leads to hot and ground to ground.
The 30 A breaker you seem to be describing is a 240V breaker. There should be two black wires or perhaps a black and red wire connected to the two screws on the breaker. So the breaker would trip if more than 30A was demanded by the load with 240V across the load. What you have connected to the breaker should be sized such that the total current is no more than 80% of the 30 A.
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30 amp using AWG #10 wire.
Two pole (for 240V), 30A typical.