Circuit Breakers Types
Circuit Breakers Types TIPS
- Circuit breakers are designed to protect the wires in your home
- Some breakers are designed to prevent shock and fires
- Match breakers to wire size
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DEAR TIM: I'm getting ready to add some electrical wiring in my house. I know that I need to install some extra circuit breakers. What are the different types of circuit breakers?
How do circuit breakers work and just what do they protect? Second, will circuit breakers protect extension cords? Katie D., Traverse City, MI
DEAR K.D.: If you haven't worked with household electric that got 240 volts of power before, I want you to be careful.
It Will Bite You - Can Be Deadly
Standard residential electricity (120/240 volt) is dangerous. You must treat it with the utmost respect. People are killed on a daily basis by electrocution and fires which result from improperly installed wiring and electrical devices.
Also, as you progress with your work, be sure it is inspected by your local inspection authority.
Circuit Breaker Fire Prevention Video
The huge house fire in this video could have been prevented with a simple special circuit breaker. Don't let your house BURN!
What Are Circuit Breakers?
The conventional circuit breakers you're getting ready to install are wonderful devices. They're basically automatic switches that disrupt the flow of electrical current in the event of an overload.
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Meant To Protect Wires
The sole function of basic circuit breakers, believe it or not, is to protect the wiring that runs from the circuit breaker panel to the various switches, outlets and fixtures. Conventional circuit breakers will not protect you from electrocution, nor will they protect equipment from voltage surges.
More Current = More HEAT
The electrical wiring in your house can be easily damaged by having too much electricity flow through it too fast. As electricity flows through a wire it generates friction.
This friction, in turn, generates heat. It's possible to generate enough heat to melt the insulation on the wires.
Wires without insulation, when crossed, have a tendency to generate sparks. Sparks seem to have a tendency to cause fires.
Bi-Metal Strip For Heat
Virtually all residential circuit breakers have two independent methods which allow them to automatically switch off or trip. The heat, we just spoke of before, can trip a breaker.
When too much heat is generated, a small piece of bimetal inside the breaker begins to bend. This bending force causes the breaker to switch off.
This property works well to protect the wiring when electrical demand slowly builds.
Electric Short Circuits
However, wiring some times short circuits. These short circuits occur when two wires touch each other and generate sparks.
Short circuits like this allow massive amounts of electricity to flow through wiring very quickly.
Small electromagnets within the breakers sense this flow and instantaneously switch the breaker off before the insulation covering the wires begins to melt.
Types Of Circuit Breakers
Here are samples and photos of the types of circuit breakers you'd find in a typical residential home like yours:
Extension Cord Issues
Electrical wiring, extension cords, and breakers are manufactured to withstand certain amounts of electrical current without damage. The standard by which they are measured is amperes or amps.
You probably have a few dangerous extension cords in your home that are made with 16-gauge wire. These can handle just 10 amps. Electrical currents passing through this wire in excess of 10 amps can cause catastrophic failure to the wire.
IMPORTANT TIP: What happens if you have this cord plugged into a 15-amp circuit?
If you are powering something that's calling for MORE THAN 10 amps, the cord insulation can MELT and catch FIRE. You need to use extension cords that have their own built-in breakers!
Extension Cord With Built-In Breakers
Related Terms: outdoor lighting, electricity literature, circuit breakers
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