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Tre fas (16A) för två ugnar (3+3kW) och spis (7kW) - räcker?
Hello gentlement,
Apologies for writing in English, I could explain problem/question in Swedish, but I'd rather be a bit more precise.
We're planning to remodel our kitchen and my wife, but of course, wants two ovens (one oven / finsmakare IKEA series + microwave/oven / finsmakare kombi mikrovågsugn). And of course spis/hob.
Now, I have 3 phase (2.5mm / 3x16A + neutral + ground/earth) in the outlet, but this gives me a dilemma. Idea is to connect hob over two phases and neutral (230V hob) + the 'real' oven to the third phase. That would leave me with microwave/oven 'hanging'. In my personal opinion, it is the best to share one of the phases connected to the hob. Is this the normal practice? (at least this is allowed in many EU regions/US). In perfect world, of course, a separate feed from the centralen should be drawn, but then again, how often do you use two ovens + the hob at high power.
The 16A circuit breaker should continuously handle ~17.3A (since 16A is 30degC rated / 17.3A @ 20degC rated). Looking at the tripping curve of the circuit breaker, you can somewhat expect it not to trip within ~2minutes of overload of ~1.5times (which basically should handle ~26A/5.9kW on shared phase, thus enough to boil a liter of water at hob boost mode + second oven max heat @3kW).
One of the potential problems I see, this way of connecting, during 'rare occasion', when two ovens are ON and nearly all power is drawn from the hob, I would end up with 4 wires heavily loaded (3 phase wires + loaded neutral due to imbalance).
Any thoughts/experience? Having troubles finding this info around.
Apologies for writing in English, I could explain problem/question in Swedish, but I'd rather be a bit more precise.
We're planning to remodel our kitchen and my wife, but of course, wants two ovens (one oven / finsmakare IKEA series + microwave/oven / finsmakare kombi mikrovågsugn). And of course spis/hob.
Now, I have 3 phase (2.5mm / 3x16A + neutral + ground/earth) in the outlet, but this gives me a dilemma. Idea is to connect hob over two phases and neutral (230V hob) + the 'real' oven to the third phase. That would leave me with microwave/oven 'hanging'. In my personal opinion, it is the best to share one of the phases connected to the hob. Is this the normal practice? (at least this is allowed in many EU regions/US). In perfect world, of course, a separate feed from the centralen should be drawn, but then again, how often do you use two ovens + the hob at high power.
The 16A circuit breaker should continuously handle ~17.3A (since 16A is 30degC rated / 17.3A @ 20degC rated). Looking at the tripping curve of the circuit breaker, you can somewhat expect it not to trip within ~2minutes of overload of ~1.5times (which basically should handle ~26A/5.9kW on shared phase, thus enough to boil a liter of water at hob boost mode + second oven max heat @3kW).
One of the potential problems I see, this way of connecting, during 'rare occasion', when two ovens are ON and nearly all power is drawn from the hob, I would end up with 4 wires heavily loaded (3 phase wires + loaded neutral due to imbalance).
Any thoughts/experience? Having troubles finding this info around.
Thanks you for your opinion!
This could be an option, but in the end, even if the hob would be 3 phase, assume approx 7kW, I would still end up with the same overload situation if all is ON at the same time, assuming I don't replace the circuit breaker.
Coming back to the question, what would be the standard solution? A shared phase with the hob, or does it necessarily require an additional cable and separate circuit breaker in centralen?
This could be an option, but in the end, even if the hob would be 3 phase, assume approx 7kW, I would still end up with the same overload situation if all is ON at the same time, assuming I don't replace the circuit breaker.
Coming back to the question, what would be the standard solution? A shared phase with the hob, or does it necessarily require an additional cable and separate circuit breaker in centralen?