Blown Fuse Repairs & Replacements.


Repairs & Maintenance



What is a Blown Fuse?

If you live in an older home your switchboard may still have semi-enclosed rewireable fuses.

These fuses are ceramic plug-in units on the switchboard. They have a length of fuse wire connected between two screws on the contacts of a fuse holder and operate in an overload or short-circuit current.

Ensure any damaged or faulty electrical appliance is checked and repaired only by a licensed electrician or authorised repairer.

If you don’t have a safety switch, contact your electrician to have one installed because they can save your life and property.

Remember only safety switches save lives. Circuit breakers and surge protectors protect appliances not people

From time to time these fuses can blow and the following steps must be used to safely replace the wire:

  1. Switch the power off from the appliance being used and unplug it.
  2. Turn off the main switch and any other control switches (such as hot water).
  3. Use the correct rated fuse wire for the size of the cable in the circuit it protects.
    • The fuse rating is generally stamped on the outside of each fuse holder or marked on the switchboard near the fuse base.
    • Never use an oversize fuse wire as it can cause damage to the electrical installation wiring or start a fire.
  4. Put the correctly rewired fuse into its holder and turn on the main power switch.
  5. If the fuse blows again with the electrical equipment unplugged the fault may be in another electrical appliance or a fault in the wiring. You should then call a licensed electrician.
rewired incorectly
old switchboard
rewireable fuse

Why did your Fuse Blow?

Overloaded Circuit

You should be able to identify the culprit in this situation by searching for an outlet or maybe an individual appliance that is used to heavily. Picture a power strip with a plugin each outlet it’s, especially if what is plugged are high-energy-users.

The Repair: Cut back on all that electricity that is tapping on a single circuit. Locate outlets on other circuits to plug or (better yet) unplug what it is you aren’t using.

Short Circuit


A short circuit is a type of electrical fault. Faults, in general, occur when an electric current stray beyond its planned path (circuit) due to a lack of immunity (e.g., from insulation or a circuit breaker).


The outcome is a weak connection between the two conductors supplying electrical power to the circuit. This causes excessive current flow from the power source by way of this”brief” or”fault.”


A short circuit may even cause the electric device accountable for it to be destroyed. Short circuits are generally ceased by circuit breakers, though, hence their name.


The Repair: Make sure the faulty device is unplugged and there is no harm to the outlet. First, examine the circuit. Then check for any damage on or around the electrical panel.

Ground Fault

A ground fault is a specific type of short circuit in which the unintentional pathway of the straying electrical current flows directly to the earth (ground) or touches a grounded part of the system (such as a grounding wire or the electric box).


The danger of shock increases when a person is in direct contact with the weak path to the ground. That’s why kitchens and bathrooms usually are equipped with GFCI (ground fault circuit interrupter) outlets.


The Fix: This is essentially the same as the fix for a short circuit. Be sure and test all affected system components and electrical devices. Call an electrician if something is still amiss.

Arc Fault

Arc faults result from issues with wiring and terminal connections–for example, a loose terminal screw. Arc fault circuit interrupters (AFCIs), if your house has them and they are up-to-date, will visit a circuit if a spark forms along faulty wiring.The Fix: This is basically the same as the above two. If your home has AFCIs, the fault must have tripped the circuit. If it doesn’t have AFCIs, then search for damage and call an electrician if needed.

Problem with the Circuit or the Breaker

Was the breaker tripped? In other words, is among the buttons on the board flipped? If so, the circuit breakers are doing what they were meant to do: cutting off the stream of electricity because of some form of surge (fault) or other problem.

The Repair: Before resetting the breaker, check for any signs of damage.

If the breaker trips again, there could be an issue. Monitor it and if it keeps tripping, call an electrician to test.

Damaged Wiring

We can say basically the exact same thing , damaged wiring may go undetected far longer and considerably more readily than damaged sockets can because the wiring is largely concealed inside the walls of your property.


Keep tabs on breaker trips.

Watch out for frayed or chewed wiring.

Search for discoloration, scorching smoke.

Texture for vibrating or warm wall sockets

Smell for burning off and strange odors.


How to prevent Blown Fuses

If excess current flowed through the cables they’d overheat and eventually begin a flame.

Fuses screw into outlets within the breaker box. The fuses include a thin strip of alloy which melts in case the present (or amperage) flowing through that circuit exceeds the sum for that fuse is graded. Circuit breakers act in the exact same style, but they can be flashed when they blow off – like a fuse, which has to be substituted.

Circuit breakers seem like wall mounted switches but include sensing apparatus. The sensing apparatus opens the circuit when it overheats because of excessive current. To reset them only flip the switch back on (on most versions you have to first reverse off the switch, then on, to reset them).

Aside from the benefit of resetting with no replacement, circuit breakers have yet another edge over fuses: fuses are synonymous. Since all match the exact same socket, there’s always the threat of substituting one fuse with a higher amperage than is secure. The higher-rated fuse allows more current to flow compared to the cables may safely manage, causing corrosion and fire

This cannot occur with a circuit breaker; you turn it back on to reset it and also the capacity stays the same. Special fuses, known as Form S, will stop unintentional replacement with fuses of a higher score. All these Type S fuses have adapters which you screw in the fuse box. The adapter won’t take a fuse with a higher score than it was created to get, and after this adapter is set up you can’t unscrew it.
In houses with fuse boxes rather than circuit breaker panels, the fuses used for stoves and other appliances, and people providing power to the entire home, are usually of the cartridge kind, in place of the screw-in kind.
If all else fails, you can always give Snap Air Conditioning / Electrical a call and we will sort out the problem for you in a snap. Call one of our friendly experts or fill out our contact form.

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