Wiktor Wise
The electrical service size of your home determines the power and efficiency of your electrical distribution system, indicating how many appliances, lights, or other electrical devices you can operate simultaneously. To determine your electrical service size, you need to identify the amperage rating of your home's electrical service, which can be done by following these steps: First, locate the main service panel, which is usually a gray metal box mounted on a wall near the exterior electrical meter. Then, open the panel and look for the main circuit breaker, which will have an amperage rating of 60, 100, 150, or 200 amps. You can also visually inspect the size of the main service cable and refer to typical widths for different amperage capacities. Additionally, check the power meter box and your electrical panel for any labels indicating the amperage rating. If you have an older home with a fuse box, you can shut off power to the whole house by locating the main fuse block and pulling the steel handle outward. Finally, you can refer to the electrical meter outside your house, as homes with overhead wires may have a meter with a glass dome, indicating 100 amps of power.
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What You'll Learn
Locate the main service panel
The main service panel, also known as the breaker box, is the distribution centre that splits the main electrical service into individual branch circuits that power your home. It is usually a grey metal box located somewhere along the inside surface of an exterior wall. It is often found in a utility area such as a garage, basement, or furnace room. When located in a finished living space, it is sometimes contained inside a finished cabinet mounted on the wall. Service panels can also be located outdoors, typically on an exterior house wall.
The main service panel includes two hot bus bars that run side-by-side down the panel. The bus bars are fed by a large breaker called the main breaker. Each bus bar carries 120 volts. A branch home circuit connected to just one bus bar will deliver 120 volts of power, while a circuit connected to both bus bars will deliver 240 volts of power.
The main service panel uses circuit breakers that control and protect the individual circuits. Circuit breakers are safety switches that prevent individual branch circuits from drawing more power than the circuit wires can safely handle. The main circuit breaker controls the electricity supply to your entire home and is usually positioned at the top or bottom of the panel. It is often labelled "Main" or "Service Disconnect".
To locate the main service panel, look for a grey or metal box mounted on a wall. It should be located where adults can easily access it but children cannot. Any exposed cables leading to it should be firmly attached to the wall and clamped tightly to knockout holes in the panel.
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Identify the main breaker
To identify the main breaker, you must first locate the main service panel inside or outside your home. This is usually a vertical grey metal box, although it can also be brown or white, and is typically mounted on a wall in a utility area. If the main service panel is in a living space, it may be enclosed in a cabinet, but it must always be easily accessible.
Once you have located the main service panel, ensure the floor in front of it is dry, then open the metal door. Inside, you will see two rows of individual circuit breakers with small toggle levers. At the top or bottom of these rows, there will be a central circuit breaker that controls the power to the entire panel. This is the main breaker, and its amperage rating will be something like 60, 100, 150, or 200 amps. The main breaker may be bolted in place or may be a snap-in breaker.
If your home has fuses instead of breakers, the panel will contain a main fuse block with a metal handle. By pulling the handle outward, so the block separates from the panel, you can shut off the power to the entire house.
If you are unsure about anything, it is always best to consult a licensed electrician.
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Check the electrical meter
To determine your electrical service amps, you can check your electrical meter.
First, locate your electrical meter. This is usually outside your home, but sometimes it is inside, in the basement or a closet on the other side of the wall from your outside electrical meter.
If you have overhead electrical service, the wires will enter a metal service pipe that runs down an exterior wall of your home to the meter. They may also connect directly to a service entrance cable, which is usually grey, and feed into the meter base. If the meter is a glass dome mounted on a square metal base, the home probably has 100 amps of power. A meter with a round base that is the same dimension as the dome, or a meter located behind a flat glass window that is flush with the front of an enclosed metal box, probably has 60 amps of electrical service.
If you have underground electrical service, you will need to check the main disconnect. The standard issue meters are usually good for 200 amps, so the writing on the meter body itself will not help. However, the size of the pipe can give you an indication of the amps. A 2" pipe indicates 200A service, a 1.25" pipe indicates 100A service, and a 1" pipe indicates 60A service.
You can also check the amperage rating on the meter. It might be printed on its face or on a label affixed to its body. It might say CL200, which means it can handle a maximum of 200 Amps.
It is important to note that the meter's amperage capacity does not necessarily indicate the actual amperage usage, as this depends on the panel it is supplying power to.
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Inspect the service wires
Inspecting the service wires is a crucial step in determining your electrical service amps. Service wires are the cables that carry electricity from the electrical utility company to your home. They are typically connected to a meter or a service entrance cable before feeding into your home's electrical system. Here are some detailed steps to guide you through the process of inspecting your service wires:
Locate the Service Wires: Start by identifying the point where the service wires enter your home. If you have overhead service wires, they may enter through a metal service pipe or conduit that runs down an exterior wall to the meter. In some cases, they may connect directly to a service entrance cable, which is usually grey, and then feed into the meter base.
Visual Inspection of Wires: Once you have located the service wires, you can perform a visual inspection. Look at the number and size of the wires to estimate the amperage. The larger the wire, the higher the amperage it can handle. For example, a 1-inch conduit housing a 6-gauge wire typically supplies 60 amps, while a 2-inch conduit housing a larger gauge wire can supply over 100 amps.
Inspect the Meter: The electrical meter can provide valuable information about the service amperage. If you have a glass dome meter mounted on a square metal base, your home likely has 100 amps of power. Newer meters may have labels or markings indicating the amperage, which could be 150 or 200 amps for larger homes with higher power demands.
Safety Precautions: Always prioritize safety when working with electrical systems. Ensure that the main power is turned off before inspecting any wires or electrical components. Be cautious of exposed cables, and always seek professional assistance if you are unsure or uncomfortable with any part of the inspection process.
Consult Professionals: If you cannot find clear indications of the amperage through your visual inspection, consider contacting your electrical company or a licensed electrician. They can provide expert guidance and ensure that your electrical service is safe and adequately sized for your home's needs.
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Consult an electrician
If you are unsure about how to determine your electrical service amps, it is best to consult a licensed electrician. They will be able to advise you on the best course of action and ensure that your home's electrical system is safe and up to code.
Electricians are trained to handle electrical systems and can provide expert advice on your specific situation. They will be able to inspect your electrical panel, meter, wiring, and other components to determine the amperage and whether any upgrades or repairs are necessary.
For example, if you are considering remodelling your home or adding new appliances, an electrician can assess your current electrical service and advise you on whether an upgrade is needed to handle the additional load. They can also help you understand the electrical demands of your home and recommend the appropriate amperage to ensure safe and efficient operation of all your electrical devices.
Additionally, consulting an electrician is crucial if you notice any issues with your electrical system, such as frequent tripping of circuit breakers or flickering lights, as these could indicate an overloaded electrical panel or other electrical problems that require professional attention.
While some people may attempt to determine their electrical service amps on their own, it is always best to seek the expertise of a qualified electrician to ensure the safety and functionality of your home's electrical system. They can provide accurate assessments, recommendations, and any necessary upgrades or repairs to keep your home's electrical system operating optimally and safely.
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Frequently asked questions
If your home has more than one 240-volt appliance (e.g. an oven, clothes dryer, etc.), you may need to upgrade your electrical service. Older homes may have a 60-amp fuse box, which is often inadequate for modern homes. Most homes require a minimum of 100 amps.
First, locate the main service panel inside or outside your home. It's usually a vertical grey metal box mounted on a wall in a utility area. Once you've found it, open the metal door and look for the main circuit breaker. The amperage rating should be written on it or next to it. Common amperage ratings include 60, 100, 150, and 200 amps.
A 200-amp service is typically required for larger homes with extensive electrical heating systems or large electrical appliances. If you have a large home with central air-conditioning or electric heat, you will likely need a 200-amp service.
