Your washing machine, electric oven, and EV charger have one thing in common: they draw more power than a shared circuit can reliably supply. Running them on the same wiring as the rest of the house leads to tripped breakers, damaged appliances, and — at worst — overheated cables. A dedicated circuit solves all of it in a single installation.

1. What a dedicated circuit is — and how it differs from a shared one

Most homes are wired on ring or radial circuits that serve multiple outlets across a room or floor. The kitchen ring, for example, might power a dozen socket outlets, sharing a single 32A MCB between them. That's fine for low-draw devices — phone chargers, kettles, small appliances — because their combined load rarely pushes the circuit close to its limit.

A dedicated circuit is different. It runs directly from the consumer unit to a single appliance or outlet, served by its own MCB or fused spur. Nothing else draws from it. The full capacity of that circuit — typically 16A to 40A depending on the appliance — is available to that one load, all the time.

The practical effect is significant:

• No voltage drop when the appliance starts up — high-draw motors and heating elements pull hard at switch-on

• No nuisance tripping when a second appliance on the same circuit kicks in simultaneously

• No overloading the shared circuit's MCB, which is the most common cause of repeated breaker trips in kitchens

• Correct cable sizing for the specific load — a shared circuit may be under-rated for a high-draw appliance added later

2. Why sharing circuits with high-draw appliances causes problems

The physics are straightforward. Every circuit has a maximum current rating, determined by the cable cross-section and the MCB protecting it. When the total load on a circuit exceeds that rating, the MCB trips. When it runs close to — but not over — the limit for extended periods, the cable heats up. Sustained heat degrades insulation, loosens terminations, and — in the worst cases — causes fires inside walls where the damage is invisible until it's serious.

High-draw appliances are particularly problematic for shared circuits because they combine two types of demand: continuous load (maintaining temperature, running a motor) and peak load (the startup surge when a compressor or heating element first switches on). The startup current of a large fridge-freezer or washing machine motor can be two to three times the running current — a brief but intense demand that can trip a shared circuit even if the steady-state load would be within limits.

The warning signs

MCB tripping repeatedly on the same circuit, appliances running slower or with less heat than expected, a warm socket outlet behind a high-draw appliance, or circuit breakers that trip when two large appliances start simultaneously — all are signs a shared circuit is being over-loaded and should be assessed.

3. Which appliances need their own dedicated circuit

UK wiring practice and BS 7671 identify several categories of appliance that should always be on a dedicated circuit. In practice, any appliance drawing more than around 2,000W on a continuous basis warrants its own supply.

Electric cooker / range

6,000–14,000W · 32–45A circuit

Legally required to have its own cooker circuit under BS 7671. Typically a 6mm² or 10mm² radial circuit with a 32A or 45A MCB and a dedicated cooker switch.

Washing machine

1,800–2,500W · 16A circuit

Draws heavily during heating cycles. Should be on a dedicated fused spur or radial, not the kitchen ring. Shared circuits often trip when the wash cycle heats up and another appliance starts.

Tumble dryer

2,000–3,000W · 16A circuit

One of the highest continuous-draw appliances in a typical home. Must never share a circuit with a washing machine — the combined load is too close to the MCB rating for safe continuous operation.

Dishwasher

1,200–2,400W · 13–16A circuit

Often installed on the kitchen ring — acceptable but not ideal for high-draw models. Dedicated spur preferred, especially in kitchens where multiple appliances run simultaneously.

Fridge-freezer

100–400W running · high startup

Low continuous draw but the compressor startup current is disproportionately high. Should be on its own socket — not a multi-way adapter or extension lead — to avoid nuisance trips.

EV charger

3,600–7,200W · 16–32A circuit

Always requires a dedicated circuit — mandatory under BS 7671 and the OZEV grant conditions. Typically a 6mm² radial with a 32A MCB, RCD protection, and often a dedicated consumer unit sub-board.

4. EV chargers, HVAC, and high-load future planning

Dedicated circuits are not only a kitchen concern. Any property adding an EV charger, an air source heat pump, underfloor heating, or a home battery system needs new circuits sized specifically for those loads. Retrofitting them onto existing circuits is not an option — the cable ratings, MCB sizes, and RCD protection requirements are all determined by the load, and they need to be designed in from the start.

The smart approach — particularly when undertaking a consumer unit upgrade or kitchen renovation — is to plan future circuits at the same time. Running a spare radial circuit to the garage for a future EV charger, or a sub-circuit to the utility room for a future heat pump, costs a fraction of returning later to run new cables through finished walls and ceilings.

What Volt assesses before installation

Before installing any dedicated circuit, we assess the available capacity at the consumer unit, the route for the new cable, the correct cable cross-section for the load and run length, and whether the existing main supply and consumer unit can accommodate the additional circuit. If the board is already full or the supply needs upgrading, we flag it before work starts — not after.

5. What a dedicated circuit installation involves

A typical dedicated circuit installation involves running a new cable from the consumer unit to the appliance location, fitting an appropriately rated MCB in the consumer unit, and terminating at a dedicated socket outlet, fused spur, or appliance connection unit. For most appliances, this is a straightforward half-day job.

More complex installations — cookers, EV chargers, or appliances in hard-to-reach locations — may require chasing cable runs into walls, fitting a sub-distribution board, or upgrading the main consumer unit to accommodate additional ways. We assess this during a free estimate visit and price the full scope before any work begins.

Every dedicated circuit we install is a notifiable job under Building Regulations Part P. We self-certify all work through our NICEIC registration, notify the local authority automatically, and issue a signed BS 7671 test certificate on completion. You're covered — for your insurer, your mortgage lender, and any future property sale.

The right circuit for every appliance. Done once, done right.

Volt Electrical Solutions installs dedicated circuits for cookers, EV chargers, washing machines, dishwashers, and any high-draw appliance across London and Essex. NICEIC approved, Part P certified, 12-month workmanship guarantee.

Call 07984 919 757 or book online — free estimates, same-day slots available.