Due to the heat output of heating tape the pot is hindered of freezing
The plant should be wind protected afterall.
The plug-in with integrated heating thermostat will be put into or around the outside of the pot:
If the heating tape is in the potting soil of the pot, power termination and end termination must be outside the potting soil.
If the heating tape is outsiode the pot it should have worked aluminum foil
aropund it to reeach a better heat distribution.
The required length is easy to calculate:
Diameter of the pot / root ball in meters x 3 x (height of the
Pot / root ball in cm divide by 20)
Example a pot 50cm high, 50cm diameter is: 0.5 x 3 x (50/20 = 2.5
rounded up) = 3 total: 4.5 m -> 5m heating tape