Home Electrical Fuses, Breakers & Panel Boxes

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Fuses, Switches, Circuit Breakers, and Electrical Panels

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What are fuses?

Fuses are a type of electrical device that are designed to fail when excess current passes through, preventing fires or damage to wiring and appliances. Though they've been mostly phased out in favour of circuit breakers, fuses are still used in vehicles, older homes, and appliances.

What are the different types of fuses?

The main types of fuses are cartridge fuses, glass fuses, and automotive fuses. Glass fuses are often used in older home electrical systems and appliances. Cartridge fuses are commonly used in smaller devices such as flashlights and extension cords. Automotive fuses control electrical current for a wide range of automobile systems.

How do I know if a fuse needs to be replaced?

When a fuse fails, all electrical current will cease and connected devices will stop working, letting you know it's time for replacement. Some fuses will also pop loud enough that you can hear them.

What are circuit breakers?

Circuit breakers are an electrical safety device that detect fault conditions like overflow or shorts and interrupt electrical flow to prevent fires or damage. Unlike fuses, when circuit breakers activate, they don't need to be replaced after each activation.

What are the different types of circuit breakers?

Circuit breakers are defined by how many poles they have, their voltage rating, and their amperage rating. Single pole breakers have 2 terminals and generally lower voltage and amperage ratings, double pole breakers have 4 terminals and higher voltage and amperage ratings. 3-pole breakers are used with heavy-duty 3-phase electrical supplies, with much higher voltages and amperages than usually found in residential systems.

How do I know a circuit breaker needs replacement?

If a circuit breaker is excessively hot, emits a burning smell, has visible heat damage or frayed wires, it should be replaced. If a circuit breaker immediately trips back to its off position after resetting it, it is probably faulty and will need replacement.

What does a panel box do?

A panel box is where the electrical wiring is installed to distribute electricity throughout a home, usually with circuit breakers to prevent abnormal current and other hazardous or damaging situations.

What size panel box do I need?

In Canada, the electrical code requires that at least a 100-amp panel box with capacity for 24 circuits be installed in all new homes. Common larger capacities are 150 or 200 amps. If you think you'll require a larger panel box, calculate the total number of amps you will need to power all your appliances and fixtures.

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