The size of your house's electrical service determines how many appliances you can run at one time. A amp service allows you to run multiple appliances at once while a 60 amp service won't provide enough power to run an electric hot water heater, electric stove and hair dryer together.
To size your electrical service, look at the main components of your house's electrical distribution system -- the wire, the conduit, the meter, the panel and the main breaker -- to identify which has the lowest amperage rating.
Its rating is your overall home's electric service rating. Measure the diameter of the conduit in which the main service wire is located. The conduit is a pipe that you can see entering your house either from the underground main electric wire or from a main wire coming off of a pole for above-ground service.
Many conduits are oversized, so it's possible to have a 60 amp service entering your house in a 2-inch conduit. Inspect the gauge of the main service wire, if you can see it.
Generally speaking, the lower the gauge number, the larger the wire. Inspect the electrical meter to see if it has an amperage rating. It may be printed on its face or on a label affixed to its body. Inspect your electrical panel for a label that indicates its amperage rating. The label may be affixed by the manufacturer, or it may be attached by an inspector from when your panel was first installed or when it was inspected after the fact. Look at the amperage rating on your main breaker or fuse, which may or may not be located in your electrical service panel with your other breakers or fuses.
The main breaker will usually be the largest breaker you have and should have its capacity written on it or adjacent to it. Compare the three ratings to find the lowest one. The lowest number is your home's electrical service capacity. If you're not sure about your service capacity, have a licensed electrician inspect your service. Do not touch any exposed wiring or you could be electrocuted. While it's okay to open the front door of your service panel so that you can access your breakers or fuses, you should not open the panel itself since it contains exposed wiring that can kill you.
Steve Lander has been a writer sincewith experience in the fields of financial services, real estate and technology. By Steve Lander Updated December 27, Tip If you're not sure about your service capacity, have a licensed electrician inspect your service.
Warning Do not touch any exposed wiring or you could be electrocuted.
Different Types of Fuse Ratings in Plugs
About the Author.The electrical system in every home has some form of circuit protection to shut off circuits in the event of an overload, short circuit or ground fault. In homes built after about —or in older homes in which the electrical service has been updated —this protection is usually provided by a series of circuit breakers in the main service panel.
Circuit breakers are mechanical devices that sense the amount of current flow and "trip" when the current flow exceeds the safe capacity of the circuit wires. However, if you have a home built before and the electrical service has not been updated, there is a good chance that you have a different of circuit protection—screw-in fuses found inside a main fuse panel.
Fuses are relatively simple devices. The fuses that protect individual volt circuit are typically ceramic screw-in plugs that fit into threaded sockets in the fuse panel. A thin metal strip inside the fuse conducts all electrical flow through the circuit and if the current flow exceeds the current-carrying capacity of the metal strip, it overheats and melts, thereby interrupting the flow of current and shutting off the circuit.
The fuse is a kind of early-warning system, which senses overloads and "blows" before the circuit wires themselves can overheat and possibly cause fire. Larger volt circuits, as well as the main fuse that controls the main power flow, use a different type of fuse design. This type of fuse is a cylindrical cartridge that fits into a fuse block that slides in and out of the fuse panel. The principle is the same—the metal conducting strip inside the fuse burns through if the current flow exceeds the safe capacity of the circuit.
Unlike modern circuit breakers, fuses cannot be rerest. Instead, blown fuses must be unscrewed or unplugged and replaced.
It is quite important that the fuses be properly matched to the amperage of the circuit. There is a distinct danger, for example, if a amp fuse is used with a amp circuit, since this creates the potential for the circuit to draw more power than the circuit wires can safely handle.
Fuses are housed in a fuse box —the precursor to the main service panel found with modern circuit breaker systems.
The fuse box is usually located away from main living areas, such as the garage, laundry room, or basement. Breakers are rectangular units with on-off toggles. Most breakers are arranged in banks or rows. In a fuse box, on the other hand, you will see a group of round screw-in plugs with small glass windows.
Your fuse panel may include several different types of fuses. The most common include:. The most common sign of a blown fuse is a power outage in one or more areas of your home. Fuses, unlike breakers, do not have on-off switches.
Instead, most fuses have a small glass window that allows you to examine the fuse itself. When the fuse blows, you will either see the melted metal strip inside the window of the fuse, or you will see cloudiness or scorch marks in the glass. This indicates the metal strip inside has melted through. Changing a fuse is usually a simple matter of identifying the blown fuse, then carefully unscrewing in and screwing in an exact replacement. It is very important that you install fuses that match the amperage capacity of the circuit wires.
Installing a fuse that is oversized for the circuit creates a risk that the circuit will draw more power than the wires can safely handle. For example, if a amp fuse is plugged into a circuit served by gauge wire which is rated to handle only amps of poweryou create a serious risk of overheating the circuit wires. NEVER install a fuse that is larger than the blown fuse you are replacing. The replacement procedure is different with a volt circuit. Here, you will need to carefully pull the fuse block from its slot and examine the individual cartridge fuses.
A small tool known as a fuse puller is helpful in extracting cartridge fuses from the block.Gallery New media New comments Search media. Log in. Search Everywhere Threads This forum This thread. Search titles only. Search Advanced search…. Everywhere Threads This forum This thread. Search Advanced…. What's new New posts New media New media comments Latest activity. New posts.
How to Determine the Fuse/Wire Size
Dec 29, 5, 66 Lawrence, KS. I'm running my If you're running the Apr 8, 1, 0 CT. Originally posted by ructwenty2 how do i know what size in-line fuse to get for my amp? Create an account or login to comment You must be a member in order to leave a comment Create account Create an account on our community.
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Latest posts. Official Trump Thread - Winners only Latest: audioholic 2 minutes ago. The Thunderdome! General Discussion. Brand new Wolfram W on the way! Newest threads. Wiring, Electrical and Installation Help.All electrical items in the home should have a plug top fitted with the appropriate fuse rating, the load amps of electrical equipment and appliances can be calculated thus The problem in most homes is that if a replacement plug top is fitted to an electrical item it will more than likely be fitted with a 13 amp fuse, regardless of what the wattage is.
So fit the lowest rated fuse available either 2 or 3 amp. Fortunately, the majority of household electrical items bought today are fitted with a moulded plug and the correct rated fuse, but it is worth having a selection of different rated fuses at home, then at least when they need replacing you have a suitable fuse available.
If you continue to use this site we will assume that you are happy with it. OK No.This is an in-depth fuse tutorial explaining everything you need to know about fuses and how to size a fuse.
For your fuse to do its job correctly and protect your wires, it should be rated about 1. Actually, the load of the circuit should have nothing to do with choosing a fuse size.
So you just bought your stuff at Oznium and are getting ready to plan your installation while USPS gets it to your door. One of the first questions to ask when planning your installation is what size wire to use, which will later determine what fuse to use.
Current is measured in Amperes, abbreviated to Amps or just the letter A. Add the values and divide by to get your total current in Amps. You can use this value in the fuse size chart above to determine the minimum wire size required. Put 1.Understanding Fuse Ratings
That table tells you that you should have no smaller than 21 gauge wire for your circuit. Fuse rating is the amount of current needed for the fuse to blow or break. When this happens, it stops the electrical power from flowing through the electrical circuit. The fuse rating is a valuable piece of information because it helps you to protect your electrical circuit and therefore should never be neglected. Every electrical circuit will need a different amount of electrical current, what is just right for one electrical circuit may be too much or too little for another.
Do the right thing and protect your circuit. Hopefully this guide helps you to install all the products here at Oznium quickly and most importantly, safely. Anyone who needs additional information or has specific or more complex installations, feel free to get in touch or post a question below. I have a question what size fuse in my car car should I run with a W LED high beam and low beam Just want to know what size I should be running to get the most out of my LED headlights whatever information you can give me that would be helpful thank you.
Or If there is some pre installed factory wire and you have changed the lights. If the wire shorts out and has too large a fuse installed it could melt the insulation right off the copper conductor and get so hot that it could start something on fire! If I misunderstood what you were asking I apologize. That is only one part of the considerations of properly fuse protecting a circuit. I am installing a 20 amp max marine waterproof 12VDC socket above my rear bumper for accessories such as a tire inflator 15 amps.
The cable run from the battery is approximately 15 feet. I want to ensure no power loss to plan on running a 10AWG wire. Is that too much, too low, or about right?
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