Guidance, not a calculator
Electrical loads and cable sizes
Working out a circuit's load, the cable it needs or which fuse or breaker to fit is electrical design. It's a job for a qualified electrician, not a calculator.
What the work involves
Designing a circuit means adding up what will run on it, choosing a cable that carries that safely over its length and through walls, insulation or heat, and matching it to the protection in the consumer unit. The answer depends on how and where the cable runs and on the installation it joins, which an electrician checks on site.
Why it's regulated
In the UK, new circuits and most work in kitchens and bathrooms are notifiable under Part P of the Building Regulations and must be certified. France and Spain have their own national wiring rules, inspections and certificates. A cable that's too small or the wrong breaker is a fire and shock risk that can stay hidden for years.
Who to ask
A registered electrician. In the UK, choose one registered with a competent person scheme, who can certify the work and notify building control. They'll test the existing installation before designing anything new.
No figures here, on purpose. We don't give sizes, rules of thumb or typical values for this work. Only a qualified professional who has seen your building can.