Do I need Part P notification for this work?

Part P applies to fixed electrical installations in dwellings in England and Wales. Notifiable work includes new circuits, work in special locations (bathroom, outdoors), and consumer unit changes. Like-for-like replacements and additions to existing circuits outside special locations are usually not notifiable. If in doubt, ask a registered electrician before starting.

Do I have to isolate the circuit before starting?

Yes. Always switch off the relevant circuit breaker at the consumer unit and confirm dead at the work position with an approved voltage tester — not a neon screwdriver. Safe isolation is the first step for any live electrical work under BS 7671.

How long does this job usually take?

Straightforward domestic electrical jobs of this type typically take 30 minutes to 2 hours for a competent DIYer with the right tools, longer if unexpected issues surface (missing earths, corroded terminals, cable routes that turn out to be more difficult than expected). A qualified electrician will usually do the same work faster.

When should I call a qualified electrician instead?

Call an electrician if the work is Part P notifiable and you are not registered, if you find rubber or cloth insulation on the cables, if there is no earth where one is expected, if you cannot confirm the circuit is dead, or if the job turns out to be more complex than expected once you open up the fitting. Cost of a callout is small compared to the risk of unsafe work.

How to Wire a Separate Hob and Oven to One Circuit (UK)

Helpful video reference. We use GSH Electrical's "An Easier Way to Wire up a Cooker" as the video reference here. GSH Electrical are UK electrical college lecturers who demonstrate using a twin outlet unit to share one circuit between a hob and a fan oven, covering the diversity that makes it safe and the correct colour coding throughout.

Before you start. Connecting cooking appliances in a kitchen is notifiable work under Part P of the Building Regulations in England. You may carry out the work yourself as a homeowner, but it must be inspected and certified by a registered electrician or the local authority building control. Speak to a registered electrician before starting if you are unsure whether the existing circuit is adequate.

1. Confirm the circuit is adequate

Check the consumer unit for the cooker circuit breaker. It should be rated at 32A and the cable should be 6mm² twin and earth. To confirm the circuit can serve both appliances, apply the diversity rule from BS 7671 Part 8: take the first 10A of the total connected load, then add 30% of the remainder.

For example: a 7.4 kW (32A) induction hob and a 2.5 kW (11A) fan oven give a connected load of 43A. Diversity: 10A plus 30% of the remaining 33A = 10 + 9.9 = 19.9A assumed demand. This is well within a 32A circuit. Work out your own appliances the same way before proceeding.

2. Isolate the circuit and prove dead

Switch off the cooker MCB at the consumer unit. Test at the existing cooker outlet with an approved voltage tester: both the line and the neutral should read zero. If there is a cooker switch on the wall, test at that too. Make a note of which breaker you have turned off and put a label on the consumer unit door.

3. Position the twin outlet unit

A twin outlet unit (sometimes called a dual outlet or dual junction unit) splits one incoming supply into two outgoing connections. Mount it on the kitchen wall in a position that is accessible from the front for future servicing and within a sensible cable run of both the hob and the oven. The unit should be fixed above the work surface or on an adjacent wall — not concealed behind an appliance that cannot be moved without disconnecting cables.

4. Terminate the incoming supply

Feed the incoming 6mm² cooker circuit cable into the twin outlet enclosure through an appropriate cable gland. Connect the conductors to the main supply terminal: brown to Line (L), blue to Neutral (N), green and yellow to Earth (E). Tighten each terminal screw firmly and ensure no bare copper conductor is visible beyond the terminal itself.

5. Connect the hob

Run a suitably rated cable from Outlet 1 on the twin outlet to the hob terminal block. Induction hobs can draw up to 32A, so 6mm² twin and earth is typically correct — always check the hob's data plate for its rated current and confirm the cable selection. Connect brown to L, blue to N, green and yellow to E at the hob terminal. Follow the appliance manufacturer's installation instructions for how to access the terminal and what strain relief is required.

6. Connect the oven

Run a suitably rated cable from Outlet 2 to the oven terminal block. Fan ovens typically draw between 11A and 16A, so 2.5mm² twin and earth is often adequate — but check the oven's data plate and size the cable for the rated current, not an assumed figure. Connect in the same colour order: brown to L, blue to N, green and yellow to E.

7. Test before restoring power

Before switching the MCB back on, carry out two checks on the new wiring. First, an insulation resistance test between all live conductors and earth: the reading should be at least 1 MΩ. Second, a polarity check to confirm the brown conductor is at Line and the blue at Neutral on both outlets. These tests are straightforward with a multifunction installation tester or a continuity tester and a simple check lamp.

8. Restore power and verify

Switch the cooker MCB back on at the consumer unit. Turn on the hob and test each zone in turn. Turn on the oven and allow it to reach temperature, checking the fan operates. After a few minutes under load, switch both appliances off and feel the connections at the twin outlet enclosure — they should not be warm. Any sign of heat at a terminal means a loose connection that must be corrected immediately.

Stop and call an electrician if: the existing circuit cable is smaller than 6mm² or the MCB is rated below 32A; the circuit has no RCD protection (this is required for new notifiable work under Amendment 4); the diversity calculation puts your combined load above the circuit rating; or any terminal is warm after a test run under load.

When to call us

Kitchen circuits often get upgraded at the same time as a new kitchen is fitted. Richard can check the existing circuit, size a new one if the current cable is inadequate, and issue the Part P Electrical Installation Certificate. Call to discuss before the kitchen goes in — it is much easier to run a new circuit before the units are fitted.

Need a cooker circuit checked or extended in Sandwich?

Richard handles kitchen electrical work including new circuits, hob and oven connections and Part P certification.

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How to wire a separate hob and oven to one circuit