If you connect two black lines together from one side nothing happens. What are you trying to do.
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Can you connect two hot wires together. Wiring to the circuit breakers is 220 volts. Can you connect two hot wires together. In order to connect two wires to an individual breaker you must make the connection in an electrical junction box outside of the distribution panel as shown in figure 3. The easiest way to see which one goes to which breaker is probably to undo the wire nut flip breakers off and use an electrical tester to see which breaker cuts the power in which wire. But its not as simple as just connecting them. One of the duplex switches had a hot wire going to the panel and was attached to the switch at one of two screws on one side that were connected to each other presumably powering both toggles and two load wires going to their respective destinations.
The answer is yes as long as you use the right size wire nut for the size of the wires that you are splicing. It sounds like if indeed you have hot wires from two different branch circuits connected together they are on the same leg same buss bar. Connecting two live wires in such a way to the switch will do nothing if both live wires are from the same source as no current will flow as they should both possess the same potential measured in volts an electrical current flows between points of different potentials but if the live wires are from different sources then likely cause damage or even an explosion somewhere in the circuit as you could created what is called a short circuit between the two different sources. In all the methods described except for the crimping method and the alligator clip method you will need to start with the wires twisted together. If its dc you may be doing it to increase amperage. We do it with batteries.
If the these two black wires are. If you know what youre doing yes. To twist two wires together you first need to strip the insulation off the wires. Next hold the wires side by side and twist them together with your thumb and forefinger. The circuit breaker box has 2 110 volt lines.
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