All North American utility suppliers are set up for 60 Hz. As such, all breakers are designed for 60 Hz operation.
Although European electricity is 50 Hz, North American breakers would no doubt function well.
It is highly recommended that you employ the services of a qualified electrician for installation or modification of any electrical service.
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To determine the hertz of a circuit breaker, you need to look at the power supply frequency that the breaker is designed to operate on. In most residential and commercial settings, the frequency is typically 60 Hz in North America, while it is 50 Hz in many other parts of the world. You can check the specifications of the circuit breaker or contact the manufacturer to confirm the frequency it operates on.
You can typically determine the amperage of an electrical panel by looking at the main breaker. A 100 amp panel will have a main breaker rated at 100 amps, while a 200 amp panel will have a main breaker rated at 200 amps. Additionally, the size and number of circuit breaker slots can also be indicators of the amperage rating.
I am assuming by your description that the panel is protected by a 90 amp breaker and the breakers in the panel when added up is 200. This is okay as long as your 90 amp breaker trips on a regular basis. It is typical for the breakers to add up to more than the main breaker under the assumption that you would rarely be running each circuit at its maximum capacity.
You can determine the size of your main breaker box by looking at the number of circuits it can handle. A typical residential main breaker box is usually 100 amps, 150 amps, or 200 amps. You can also check the label on your breaker box or consult with an electrician for assistance.
200. Although you cannot exceed current ratings on any branch circuit without tripping that circuit. You need to make sure that you do not exceed 160 continuous load amps to meet NEC requirements of not overloading a breaker to more than 80% under continuous load.
The number of amps cannot be determined from just the energy in joules. To calculate the current in amps, you would need to know the voltage of the circuit as well. Amps is equal to power (in watts) divided by voltage.