Ultimate Electrical Guide 2026 — Safety, Wiring & Repairs

What is in your consumer unit

The consumer unit — the fuse board — is where the incoming supply is split into circuits and where the protection lives. A modern board contains a main switch, RCDs or RCBOs that detect current leaking to earth and disconnect within milliseconds, and MCBs that trip on overload.

If your board has rewirable fuses, a wooden back, or no RCD protection at all, it predates current standards by decades. It is not automatically dangerous, but it offers no protection against the fault type that causes most electrocutions, and it is the first thing an electrician will flag.

Warning signs you should not ignore

• A breaker that trips repeatedly. It is doing its job. Resetting it without finding the cause is the equivalent of silencing a smoke alarm.
• Warm or discoloured sockets and switches. Heat means resistance, and resistance at a connection is how electrical fires start.
• A burning or fishy smell near an outlet. Turn off that circuit and call an electrician immediately.
• Lights dimming when appliances start. Often a sign of an overloaded or poorly terminated circuit.
• Buzzing from the consumer unit. Never normal.
• Any shock, however mild, from an appliance or tap. Treat as an emergency.

EICR certificates and what they mean

An Electrical Installation Condition Report is a periodic inspection of a whole installation. It grades faults: C1 is danger present and requires immediate action, C2 is potentially dangerous and requires urgent remedial work, C3 is improvement recommended but not a failure, and FI means further investigation is needed.

Landlords in England must have a valid EICR at least every five years and provide a copy to tenants. Homeowners are not legally required to hold one, but insurers increasingly ask, and a report every ten years — or at purchase — is sensible. A C3 alone does not fail a report; be wary of anyone who tells you it does and quotes accordingly.

Part P and what you may legally do yourself

Part P of the Building Regulations governs domestic electrical work in England and Wales. Notifiable work — a new circuit, a consumer unit replacement, and any work in a special location such as a bathroom — must be carried out by a registered competent person or notified to building control in advance.

Replacing a like-for-like socket, switch or light fitting on an existing circuit is not notifiable. Even then, isolate at the consumer unit, prove dead with an approved tester, and stop if the existing wiring is old rubber or fabric insulation.

When rewiring is genuinely necessary

Full rewires are sold more often than they are needed. The honest triggers are: rubber, lead or fabric-insulated cable; no earth on lighting circuits; widespread deterioration confirmed by insulation resistance testing; or a major renovation where walls are open anyway. Age alone is not a reason — a sound 1990s installation may test perfectly.

EV chargers and modern loads

Home charging is now one of the most common reasons for an electrical upgrade. An installer must confirm the incoming supply can carry the load, check earthing arrangements, and fit the correct protection. Where the main fuse or earthing is inadequate, the DNO must be involved — a good installer tells you this before taking a deposit, not after.

Choosing an electrician

Ask which competent-person scheme they are registered with and check the registration number directly with the scheme. Ask what certificate you will receive on completion — a Minor Works Certificate or an Electrical Installation Certificate. Ask whether test results will be included. Work that arrives without paperwork is work you cannot prove, and that becomes your problem when you sell or claim.