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Answer for UK, Europe and countries running a 50 Hz supply service.

It is acceptable to connect two 15-amp breakers to a 30-amp supply. It woud also be acceptable in some applications to connect three 15-amp breakers if it were known that the total current would not exceed 30 amps. For example in many UK properties there is a 60-amp supply, and connected to this there are two 30-amp supplies for the ring-circuit and the cooker, plus also a 10-amp lighting supply.

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Q: Why are there two 15 amp breakers connected to your 30 amp breaker?
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