What should I do if my isolation switch catches fire – Advice from Electriman, North London Electricians

An isolation switch catching fire is a serious electrical emergency — here is what you need to know and do.

Immediate steps to take:

Call 999 immediately — do not delay, even if the fire appears small

Evacuate everyone from the property without stopping to collect belongings

Do not touch the switch — it may be live and conducting heat or flame

Only cut power at the main consumer unit (fuse board) if it is safely accessible without entering a smoke-filled or flame-affected area

Never use water on an electrical fire — use a CO2 or dry powder extinguisher only if trained to do so and the fire is very small

What causes an isolation switch to catch fire?

Isolation switches (also called isolator switches or main switches) can catch fire for several reasons:

Loose terminal connections — the most common cause, creating resistance, heat, and eventual ignition

Overloading — drawing more current than the switch is rated for

Age and deterioration — older switches may have degraded insulation or contacts

Poor or DIY installation — incorrectly rated or poorly terminated equipment

Moisture ingress — particularly in outdoor or garage consumer units

After the fire service has attended:

Do not restore power under any circumstances until a qualified electrician has inspected the installation

Request an EICR (Electrical Installation Condition Report) to a

Need a qualified electrician in North London?

Electriman covers Mill Hill, Barnet, Finchley, Edgware, Enfield, Watford and surrounding areas. All work is Part P certified and fully insured.