Thanks for all the replies, from my understanding, while it will be possible to run heater as single phase, if 2kw is all it can do that wont be enough. Need at least 3kw to heat the sauna we have.
Thanks for all the replies, from my understanding, while it will be possible to run heater as single phase, if 2kw is all it can do that wont be enough. Need at least 3kw to heat the sauna we have.
It will make the same 6kW single phase. Just instead of having 2kW each for three phases, you will have 6kW from a single phase.
This is done by bridging L1, L2 & L3 together and feeding from the same phase. Some appliances even come with nicely shaped bits of copper to bridge tougher the screws, but if not your installer can use wire.
Only issue is having enough power in the house, but at 26A I don't think that would be a big issue. If you are pushing the limit's, my understanding is that the sparky can install a main breaker for your house, meaning that if somebody cranks the heating, oven, stovetop, tumble dryer, sauna all at the same time, that breaker will trip, protecting the pole fuse (which requires a call out from the lines company to reset).
The N & K terminals are so you can switch a contactor to feed a second slave heater with the same timer and thermostat. They are not a single phase input and if you connect power to them, it will run that element only with all the safety functions and timers bypassed. Not a good idea.
They are all in star so bridging L1/2/3 should work, and the manual implies this. I would say electrician needs to confirm terminal and wire sizing. Requires a 32A circuit and mains capacity for a 26A load. Depending on what else is in the house, this could be an issue.
Fuses and MCBs do not discriminate particularly well. Unless the breaker is sized smaller than the fuse, it's likely a toss-up as to which operates first in an overload. Fuse will be faster every time in a short circuit situation.
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