I would say if the CB is max a 15amp then it should be ok for the 1.5mm.
I have seen that before and deemed it ok and the boss did too. But maybe there is something I am missing with it
Edit: is a gate motor an appliance ? If so then a mixed circuit is ok
6.15.4.1 Except as allowed in 6.15.4.2, 6.15.4.3 and 6.16.3.2.3, there shall
be no mixed loading of circuits.
6.15.4.2 Except as required in 6.16, a non-dedicated single-phase circuit that
has overcurrent protection rated at not more than 20 A may supply a mixed
load of a combination of any socket-outlets rated at not more than 16 A,
luminaires and fixed appliances.
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