They are in tandem because they power a 220 VAC circuit, rather then a 110 VAC circuit.
Touching two hot wires together can cause a short circuit, which may have damaged the breaker. It is important to not touch hot wires together as it can be dangerous and cause damage to the electrical system. If the breaker will not reset, it is recommended to call a licensed electrician to assess and repair the situation.
30amps
On most residential circuit breaker boxes in North America, each individual breaker represents one 120-volt circuit. Two breakers ganged together represent a 240-volt circuit.
No, add new breaker,find a junction box and split the series, or add a box and split the load. You only need to do this if the breaker is tripping from overload. 12ga wire should have a 20amp breaker not a 15amp. If I understand your question,wired in parallel, this would be one hot connected to two breakers, first off two breakers is 220v not 120v , and 220v has two hot wires. Never connect two breakers together on one line.
Two single-pole 30 amp breakers tied together make a two-pole 30 amp breaker. From this you can power a device that requires 220-240 volts, typically.
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One and half breaker system is an improvement on the double breaker system to effect saving in the number of circuit breakers. For every 2 circuits, 1 spare breaker is provided: Two feeders are fed from two buses via their associated circuit breakers and these two feeders are coupled by a third circuit breaker which is called tie breaker. During failure of any of the two feeder breakers, the power is fed via the breaker of the second feeder and main breaker (tie breaker).
The electrical terminology for this type of breaker is a tandem breaker. It is where two breakers circuits can be in the same one breaker slot in a distribution panel. On this type of breaker there will be two output for a circuit value of what ever the breaker is rated for.
To do so LEGALLY, the circuit breaker must not be rated at a capacity (in AMPS) greater than the SMALLEST wire.
A double 15 amp breaker in residential wiring is typically used to supply power to large appliances like electric stoves, dryers, or air conditioning units. The double breaker allows for a 240-volt circuit to be created by using two 120-volt circuits together.
To check if you have 240 volts on a 30 amp two pole breaker, you can use a digital multimeter set to measure voltage. Turn off the breaker, then test between the two breaker terminals and ground. If you read around 240 volts, it indicates that the breaker is providing the right voltage. If not, there may be an issue with the breaker or the wiring.
One way is to create a current overload deliberately i.e. run two two high-powered electrical appliances (such as, say, a 12 amp vacuum cleaner and a 2 kilowatt electric kettle) together on a circuit that is protected by a 15 or 20 amp circuit breaker. Or create a short circuit.