Hi. what protection to place on the main board (thermal and circuit breaker), for a three-phase air conditioner, its label says Normal, 6600 W - 11.2 A - Maximum, 8700 W - 14.8 A, and what cable diameter to use for said connected. The air is 10 meters away from the board. Thank you...

Hello, if you have three-phase and at its maximum consumption it is 8700 W, it would give about 20 amps, but if on the manufacturer's label it says 14.8 amps, that will be the actual consumption, in any case the cable and thermal to be used will be on the maximum consumption (15 ampers) Cable: 2.5 mm2 that supports 18 amp in three-phase (do not take into account the voltage drop that is calculated by distance) Thermal: 16 amperes would be the right thing, although it would be at the limit you would have an ampere to spare If it consumed more amper, than you could measure it with an amperometric clamp, you would have to use a 4 mm2 cable that supports 25A with its 25 amper thermal if the air consumption were greater than 18 amper

Calculation will be a minimum 6 tn equipment .... I recommend thermal 20A (tetrapolar) differential switch ... (if required) 4x25 A 0.03A although it may be included in the general differential protection of 30 mA always the circuit cannot be unlinked from the main board header device. so.... thermal 4x20A, differential 4x25 / 30 mA and 4 mm² cables, (beyond the calculation of voltage drop made by the colleague) this is because the thermal of 16 is damasiated adjusted Cheers