What Is the Safest Way to Change a Fuse?

What Is the Safest Way to Change a Fuse?

Fuse panels are still found in older Ontario homes — typically pre-1960 construction that has not had a panel upgrade. Fuses provide the same overcurrent protection function as circuit breakers, but they are one-time devices: when a fuse blows, it must be replaced. Changing a fuse safely requires understanding why it blew before replacing it.

Before You Change the Fuse

• Identify why the fuse blew — check if you were running too many appliances on the circuit, if there was a visible spark or burning smell, or if the fuse blew immediately when you turned something on (which indicates a short circuit rather than an overload)
• If the fuse blew due to an overload, reduce the load on that circuit before replacing the fuse — unplugging devices before you reset
• If the fuse blew due to a suspected short circuit or fault, do not replace it until the fault is identified. A replacement fuse will blow again immediately, and repeated attempts can damage wiring

Changing the Fuse Safely

• Stand on a dry surface — not wet or damp ground. Do not stand in water or on wet flooring near the panel
• Use only one hand inside the panel if possible — keep the other hand at your side or behind your back to reduce the risk of current flowing through your chest if you contact an energized component
• Use the correct amperage replacement fuse — never substitute a higher-rated fuse to stop it from blowing. This is a serious fire hazard: a 20-amp fuse in a 15-amp circuit allows the wire to overheat before the fuse blows
• Use Type P (tamper-resistant) fuses in 15-amp and 20-amp sockets to prevent over-fusing

If your home still has a fuse panel, consider upgrading to a modern breaker panel. EZSMART installs panel upgrades across Ontario and can assess your current panel capacity and service requirements. Contact us for a quote.

Amir Azimipour

Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp