Quick answer
No. A 2.5mm cable is not suitable for a 32-amp cooker circuit under BS 7671. The standard current-carrying capacity of 2.5mm twin and earth cable clipped direct is around 27 amps, which falls short of the 32-amp demand even on a short run. Cable length does not override the fundamental rating. You must use a minimum of 6mm cable for a 32-amp cooker circuit. Have a Part P registered electrician install the correct cable size to avoid overheating, fire risk, and a failed EICR.
It is a very common question and an understandable one. If the cable run is only a metre or two, you might think the resistance is so low that a smaller cable would cope. Unfortunately, that is not how cable sizing works in UK wiring regulations, and using 2.5mm cable on a 32-amp cooker circuit would be unsafe and non-compliant.
Why cable size matters more than length
Cable is sized primarily by how much heat it can safely carry continuously, not just by its resistance. A 2.5mm twin and earth cable in the most favourable installation method, clipped directly to a surface with nothing around it, is rated at roughly 27 amps. The moment you push 32 amps through it, the conductor runs hotter than it is designed for. Over time, or under sustained load, that heat degrades the insulation, creates a fire risk, and can cause the cable to fail.
What about short runs?
A shorter run does reduce voltage drop, and BS 7671 does allow you to consider voltage drop as part of the design. However, voltage drop is a separate consideration from current-carrying capacity. A short run of 2.5mm cable still cannot safely carry 32 amps continuously. The two calculations are completely independent of each other.
What cable does a cooker circuit actually need?
For a standard 32-amp cooker circuit in a domestic property you need:
6mm twin and earth cable as a minimum for most installations.
A 32-amp Type B or Type C MCB or fuse at the consumer unit.
A cooker control unit or isolator switch rated for the load.
Proper fixings, correct earthing, and protection against mechanical damage where needed.
If your cable is buried in a wall, running through insulation, or bundled with other cables, even 6mm may need to be derated or replaced with 10mm. An electrician will calculate this properly.
What should you do?
Do not attempt to wire a cooker circuit yourself unless you are a competent person under Part P of the Building Regulations. This type of work is notifiable in England, Wales, and Scotland, meaning it must either be done by a registered electrician or notified to your local authority building control. Call a Part P registered electrician, ask them to size the cable correctly and issue a Minor Works or Installation Certificate on completion.
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