I have a 4mm 3 core SWA cable approx 70ft runming from plug socket in house. This has fused spur and switch on outside of wall and runs to a outdoor style double socket in summer house. The ring is on a 32amp breaker. I have run electric lawnmower on socket. Due to lockdown have brought kids 10ft pool. Question is can i run 3kw heater from this outdoor socket. Quick calculafiom would suggest i would be running at almost 13amps? Would that mean tripping other electrics on the circuit? Thanks