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Do I Need A 15 Or 20 Amp GFCI?

GFCI outlets provide a good night’s sleep in the middle of bizarre thunderstorms by immediately identifying and terminating ground faults, offering protection against electric shocks, and reducing the likelihood of electrical fires. GFCI outlets are designed to improve electrical safety.

You can use both 15 and 20-amp GFCI. You only need to remember that in the area where your heavy-load appliances are present, you will need 20-amp GFCI. For example, your bathroom, kitchen, and laundry.

A GFCI outlet’s primary job is to monitor how much power is being used in a circuit. The GFCI outlet instantly breaks the electrical circuit when a ground fault is found, usually within milliseconds. Electrical shocks can be potentially harmful or even lethal. Therefore this quick cutoff of electricity helps prevent them. The GFCI outlet helps prevent electric shock injuries by cutting off the power.

Gfci Outlet 2

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Understanding the Purpose of GFCI Outlets

GFCI stands for Ground Fault Circuit Interrupter. 

Like conventional circuit breakers, GFCI outlets offer additional protection against overloads and short circuits in addition to their quick response to ground faults. 

In order to reduce overheating and potential fire concerns, they include built-in circuitry that can detect excessive current flow and trip the circuit.

I have 15-amp GFCI in my bedrooms, and in the kitchen, laundry, and bathroom area, I have 20-amp GFCI. 

Also, in the lawn and garage area, I have 20-amp GFCI.

Differentiating Between 15-Amp and 20-Amp Circuits

The main difference between 15-amp and 20-amp circuits lies in their maximum current carrying capacity. 

Here’s a breakdown of the key distinctions:

Maximum Load Capacity 

A 20-amp circuit can handle a maximum load of 20 amperes (or 2,400 watts), whereas a 15-amp circuit can handle a maximum load of 15 amperes (or 1,800 watts). 

This indicates that a 20-amp circuit may support more electrical appliances and ones with more power without tripping the circuit breaker.

Outlet Rating

Typically, outlets on circuits with 15 and 20 amps are rated at 15 and 20 amps, respectively. 

For safe functioning, it’s crucial to select outlets that correspond to the circuit’s UL rating. 

Utilizing a lower-rated outlet on a circuit with a higher amp rating can result in risky overheating and fire hazards.

Wire Gauge

Because 15-amp and 20-amp circuits have different current capabilities, they require different wire gauges. 

14-gauge copper wire is typically used in 15-amp circuits, while 12-gauge copper wire is needed in 20-amp circuits. 

Better conductivity and a lower chance of overheating are made possible by the bigger wire size used in a 20-amp circuit.


15-amp circuits are frequently used for lights, all-purpose outlets, and more compact appliances with lower power requirements. 

Bedrooms, living rooms, and other spaces with standard electrical requirements are where you’ll often find them. 

On the other side, 20-amp circuits are frequently built in rooms that need more power, such as kitchens, laundries, workshops, and spaces with large appliances or equipment.

The Importance of GFCI Protection

GFCI (Ground Fault Circuit Interrupter) protection is of utmost importance for electrical safety. 

Here are some key reasons why GFCI protection is crucial:

Prevention from the external shocks

Electrical shock

GFCI outlets are designed to identify ground faults rapidly, which occur when electrical current deviates from its intended course, such as via a person’s body. 

GFCI outlets can quickly terminate the circuit by sensing even little variations in current flow, considerably minimizing the risk of electrical shock. 

This safeguard is essential in spaces where water is present, such as restrooms, kitchens, and outdoor areas.

Improved personal safety 

Electrical shocks can be dangerous, causing severe injuries or even death. GFCI protection protects people from the potentially lethal effects of electric shocks. 

GFCI outlets dramatically limit the period of exposure to electric current by disconnecting the circuit in milliseconds, reducing the chance of catastrophic injury.

Water is a good conductor of electricity, thus increasing the risk of electrical shock. GFCI outlets are built explicitly for use in damp situations. 

GFCI protection is essential in situations where water is present, such as restrooms, pools, spas, or outdoor receptacles, to prevent electrocution incidents.

GFCI outlets not only guard against electrical shocks but also aid in reducing fire risks. 

They have circuitry to detect high current flows produced by short circuits or overloads. 

GFCI outlets prevent overheating of wires, which can lead to electrical fires, by tripping the circuit when such conditions occur.

Determining the Amperage Requirements of Your Circuit

If you are installing a GFCI in your electrical circuit, you need to ensure adequate amperage requirements. 

Determining the amperage requirements of your circuit is easy and requires the following steps:

  • Recognize the Appliances and Devices: Make a list of all the appliances, equipment, and electrical loads that will be under evaluation. Lights, outlets, kitchen appliances, heating and cooling equipment, and any other electrical devices that will use electricity from the circuit should be included.
  • Examine the Device Labels: On each device, look for labels or nameplates that provide information about its power consumption. The device’s Amperage (in amps or A), voltage (in volts or V), and wattage (in watts or W) may be indicated on the label. Take note of each device’s amperage rating.
  • Calculate the total Amperage of all devices and appliances connected to a circuit: add up each device’s amperage ratings. That is going to give you the full Amperage required for your circuit. Remember to consider the highest value for accuracy in calculations because some devices may have both an operating speed and a surge current.
  • Comparison of circuit capacity: Check whether the circuit breaker or fuse in question is rated for that circuit. The rating shall generally be printed on the electrical circuit switch or fuse. This is the maximum power level that a circuit will be capable of handling. Please ensure that your devices’ overall amperage requirements do not exceed their circuit rating. In general, it is recommended to have a certain degree of headroom and not to continuously operate the circuit at its maximum capacity.
  • Call an expert electrician: If you are unsure about any aspects of setting the minimum amperage requirements, as well as if you have a difficult electric demand, it is advisable to ask for advice from an experienced technician. They’re capable of carrying out a comprehensive assessment, considering further factors like wire size, voltage drop, and location code for the electricity you are concerned with, as well as providing appropriate recommendations on your specific situation.

Understanding Load Capacity and Device Compatibility

Wire types

Understanding the load capacity of electrical circuits and ensuring device compatibility is crucial for maintaining a safe and efficient electrical system. 

Here’s a breakdown of load capacity and device compatibility. 

It is simplified for a person to understand in an easier way.

The load capacity shall be defined as an amount of current in a circuit or component that is safe for operation and does not exceed its intended limits. 

It is measured in amperes, which are determined by factors such as the wire’s size, the circuit breakers’ rating, or the capacity of the electrical devices connected to the circuit.

In order to guarantee the safety and regularity of operation, each electric device shall have its own electricity requirements, which must be fulfilled. 

The ratings of voltage, Amperage, and watts may be included in these requirements. 

Ensuring that the electrical devices you’re connecting to your circuit are in compliance with its specifications is of paramount importance.

A device’s wattage tells us how much electricity it will use in the course of operation, based on a multiplying of its voltage and Amperage. 

In determining the overall load for a circuit, an account should be taken of the devices’ wattage. 

It is essential to prevent overloading by ensuring all devices have the same cumulative power output without exceeding their circuit’s capacity.

When electrical installations or modifications are carried out, it is vital to comply with the applicable codes and regulations of your area. 

It helps to prevent overloading, reduce the risk of electrical hazards and prolong the life of your power system by following proper load capacities guidelines and ensuring that equipment is compatible.

Code Requirements and Local Regulations

Ensuring the safety and functioning of electrical systems is a key role played by code requirements and local regulations.

The NEC is a commonly accepted standard that sets out safety measures for installing and using electric systems. 

The Directive shall deal with different aspects, e.g., wiring methods, electrical installations, grounded, circuit protection, etc. 

In order to incorporate new technology and safety procedures, the NEC shall be kept up to date at regular intervals.

Given the NEC’s status as a global standard, individual states, local authorities, and municipalities are also free to transpose their own version of the code. 

Specific provisions or additional requirements, which are based on regional considerations and specific safety risks, may be amended by these local authorities.

Individual municipal codes and regulations may lay down specific requirements based on the type of accommodation, i.e., apartments, businesses, or factories. 

Aspects such as the way in which cables are laid, circuit capacities, safety devices, emergency systems, energy efficiency, and accessibility issues can be covered by these requirements.

A number of additional codes and regulations are often required in specific installations, e.g., those involving renewable energy systems, swimming pools, spas, dangerous places, or medical facilities. 

Special attention is given to the safety of those specialized installations, and they may also entail additional authorizations, inspections, or conformity with industry standards.

It is recommended to consult local building authorities, electrical inspectors, or licensed electricians to ensure compliance with the requirements of the Code and local regulations. 

They can give you accurate information on your area’s relevant codes, permits, and specific requirements. 

Applying these guidelines is a step forward in promoting electricity safety, minimizing risk, and ensuring that energy systems comply with relevant standards.

Factors Influencing the Choice of a 15-Amp or 20-Amp GFCI


It can be confusing for someone who isn’t an electrician to decide between a 15-Amp or 20-Amp. 

Several factors should be considered when choosing between a 15-amp or 20-amp GFCI (Ground Fault Circuit Interrupter). 

Here are some key factors that can influence the choice:

1. Load Requirements

Assess the electrical load requirements of the circuit. 

Determine the total Amperage needed for the devices and appliances that will be connected to the GFCI. 

If the load exceeds 15 amps, a 20-amp GFCI may be necessary to handle the higher current demands.

2. Circuit Wiring 

Evaluate the wiring of the circuit. A 15-amp GFCI should be used with a 14-gauge wire, while a 20-amp GFCI requires a 12-gauge wire. 

If the existing circuit is wired with a 14-gauge wire, it is compatible with a 15-amp GFCI. 

However, if the circuit is wired with a 12-gauge wire, a 20-amp GFCI should be used to match the wire size.

3. Outlet Compatibility 

Consider the rating of the outlets connected to the GFCI. 

Outlets on a 15-amp circuit are typically rated at 15 amps, while those on a 20-amp circuit are rated at 20 amps. 

Ensure that the GFCI rating matches the rating of the connected outlets for proper compatibility.

4. Circuit Breaker 

Check the rating of the circuit breaker protecting the circuit. 

A 15-amp GFCI should be used with a 15-amp circuit breaker, while a 20-amp GFCI requires a 20-amp circuit breaker. 

The GFCI and the circuit breaker should have matching amperage ratings to ensure proper protection and coordination.

5. Future Needs

Consider any potential future electrical requirements or upgrades. 

Suppose there is a possibility of higher power demands in the future. 

In that case, it may be wise to install a 20-amp GFCI and the appropriate wiring to accommodate potential expansions or additions to the circuit.

6. Compliance with Electrical Codes

Ensure that the chosen GFCI, along with the associated wiring and components, complies with local electrical codes and regulations. 

Local codes may dictate specific requirements for GFCI installations, including amperage ratings, outlet types, and locations.

Considerations for Specific Areas and Applications

When installing a GFCI (Ground Fault Circuit Interrupter), there are specific areas and applications one should keep in mind about the location before installing a GFCI. 

Here are some considerations for installing a GFCI in specific areas:

1. Wet and Damp Locations

Kitchen outlets

GFCI protection is crucial in environments where water is present, such as bathrooms, kitchens, laundry rooms, garages, outdoor outlets, and crawl spaces. 

The potential for electrical shock is heightened in the presence of water, and GFCIs are designed to swiftly detect ground faults and interrupt the circuit to avert accidents.

2. Outdoor Areas 

Outdoor outlets, including those in yards, patios, decks, and near pools or spas, should be equipped with GFCI protection. 

Exposure to moisture and environmental conditions necessitates the use of GFCIs to minimize the risk of electrical shocks.

3. Kitchens 

Kitchens often have a high concentration of electrical appliances and water sources, making them prone to electrical hazards. 

All countertop outlets, as well as those within six feet of sinks, should be protected by GFCIs to ensure safety during food preparation and cleanup.

4. Bathrooms

GFCIs are required for all bathroom outlets, including those near sinks, bathtubs, showers, and Jacuzzis. 

The presence of water and the potential for contact with electrical devices heighten the risk of electrical shock, making GFCI protection essential.

5. Laundry Rooms

The combination of water, moisture, and electrical appliances in laundry rooms necessitates GFCI protection. 

All outlets within six feet of laundry sinks or water sources should be GFCI protected to reduce the risk of electrical accidents.

6. Garages and Workshops 

GFCI protection should be provided in garages and workshops, especially when power tools, outdoor equipment, or wet conditions are involved. 

These areas often have unique electrical demands and require GFCIs to enhance safety.

8. Commercial and Industrial Settings 

GFCI protection is also essential in commercial and industrial environments where electrical equipment, machinery, and heavy-duty appliances are used. 

Areas such as manufacturing facilities, construction sites, and food processing plants should adhere to GFCI installation guidelines to minimize electrical hazards.

Evaluating the Existing Wiring and Electrical System

It is essential to consider several key factors to evaluate the existing wiring and electrical system in a building. 

Here are the steps you can follow:

  • Visual Inspection and Verification: You should start by conducting a visual inspection of the electrical system, including the main electrical panel, subpanels, wiring, outlets, switches, and fixtures.
  • Age of the System: Determine the age of the electrical system. Older systems might have outdated wiring or components that do not meet current safety standards. This information can help assess the overall condition and potential risks associated with the system.
  • Electrical Panel: Examine the electrical panel to ensure it is appropriately labeled, with each circuit clearly identified. Check for signs of corrosion, overheating, or improper wiring inside the panel. Verify that the panel size and capacity are appropriate for the building’s electrical demands.
  • Grounding and Bonding: Inspect the grounding and bonding system to ensure proper connections and adequate grounding electrodes. Grounding protects against electrical shock and provides a path for excess electrical current during faults. Look for any loose or disconnected ground wires.
  • Outlets and Switches: Test all outlets and switches to ensure they are functioning correctly. Check for loose outlets, broken switches, or any other visible signs of wear and tear.

Consultation with Electricians or Professionals

Before the installation of GFCI, consult with your electrician or seek professional help from a professional.

  • Check Licenses and Certifications: Ensure that the electricians or professionals you are considering are properly licensed and certified in your area. This guarantees their expertise and adherence to electrical safety standards.
  • Initial Contact: Reach out to the electricians or professionals you have identified as potential candidates. Explain your project requirements, including the number of GFCIs needed, specific locations, and any other relevant details. Inquire about their experience with GFCI installations and their availability.
  • On-Site Assessment: Schedule an on-site assessment or consultation with the electricians or professionals you have contacted. They will evaluate your electrical system, identify suitable locations for GFCIs, and assess any additional requirements or modifications that may be necessary.
  • Cost Estimates: Request detailed cost estimates for the GFCI installation, including the cost of materials, labor charges, permits (if required), and any other potential expenses. It’s advisable to obtain multiple estimates to compare prices and ensure you receive a fair and competitive offer.
  • Discuss Safety Measures: During the consultation, discuss safety measures that the electrician or professional will implement during the installation process. This includes proper grounding, adherence to electrical codes, and overall electrical system safety.

Cost and Practicality Considerations

Dishwasher install

When considering the installation of Ground Fault Circuit Interrupters (GFCIs), it is essential to consider cost and practicality.

Here are some factors to keep in mind


It is possible to get a different cost depending on the type of outlet, circuit breaker, or portable GFCI device and brand. 

You can estimate the cost range by comparing prices from a variety of manufacturers and suppliers. 

In addition, an account must be taken of all other costs such as electricity supplies, permits, or labor for the installation if they are necessary.


Please specify the number of GFCIs you need to set up for your installation. 

In areas where GFCI protection is mandatory under electrical codes, such as bathrooms, kitchens, outdoor outlets, garages, and basements shall be assessed. 

To estimate the needed quantity of GFCIs, look at the number of outlets and circuits in these areas.

Installation method

The installation procedure can be adapted according to the current electrical infrastructure. 

Installation of GFCI outlets may be a simple process if the electrical system has an accessible junction box. 

However, a more appropriate solution could have been to install GFCI breakers in the principal panel if it was difficult to access the wires. 

In order to determine which method of installation is suitable, you must examine the existing electric equipment and seek advice from an electrician.

Installation requirements

GFCI installations are capable of requiring specific installation configurations. 

Some existing electrical connections may need to be modified or upgraded to meet the requirements for GFCI installations. 

This may lead to an increase in the total cost of installation. 

If necessary, a professional electrician may conduct an assessment of the electrical systems and advise on any changes required.

Long-Term Benefits

While GFCI installations may incur upfront costs, it’s essential to consider the long-term benefits. 

GFCIs provide crucial safety features by quickly interrupting electrical circuits in the event of a ground fault, preventing electric shocks, and potentially saving lives. 

The installation cost should be weighed against the potential risks associated with not having GFCI protection in areas where it is required.

Energy Efficiency 

GFCIs are energy-efficient devices using minimal power to monitor the electrical circuit constantly. 

They do not significantly contribute to electricity consumption or utility costs. 

However, installing GFCIs may require temporarily shutting off power during the process, which could result in minimal energy usage disruption.

Return on investment

By installing GFCIs, your property’s overall valuation can increase and make it more attractive to potential buyers or tenants. 

GFCIs show a commitment to security, which can be beneficial for the evaluation of properties and insurance considerations.

Professional Installation

While it may be tempting to attempt a DIY installation to reduce costs, it is highly recommended to hire a professional electrician for GFCI installations. 

They have the knowledge, skills, and experience to ensure the installation is done correctly, adhering to electrical codes and safety standards.

Common Misconceptions

Gfci Outlet 2

Here are some common misconceptions to be mindful of:

GFCIs offer complete protection from electrical hazards

Although they are a highly effective tool in protecting against ground faulting and electric shocks, they will give you a sound sleep even when there is extreme lightning. 

But it does not provide adequate protection for every kind of electrical hazard. 

The electrical imbalance caused by ground fault conditions are tackled mainly by GFCI, but they do not protect against other potential electrical risks, such as short circuit or overload.

GFCIs eliminate the need for proper grounding 

GFCIs are designed to provide an additional layer of safety, but they do not replace the need for proper grounding in electrical systems. 

Grounding is the specific safety measure to ensure that excessive electricity currents shall be appropriately diverted in case of malfunction. 

In order to improve overall electric safety, GFCIs, and grounded devices are working in conjunction. 

It is essential to make sure that GFCIs, as well as proper ground links, are in place for your electric system.

GFCIs can be fitted on the spot

GFCIs are required to comply with specific installation requirements set out in electric codes. 

Where there is a higher risk of electrical shocks, such as bathrooms, kitchens, garages, or external outlets, they should be fitted in these areas. 

GFCI protection does not need to be provided for all outlets in a building. 

In order to identify the correct location of GFCI devices, local codes or an expert electrician must be consulted.

GFCIs are just needed in new construction

In addition to being essential safety devices that protect against electrical shocks, whether a new building or an existing one, they shall also be used as security equipment. 

In areas where GFCIs are required by electrical codes, retrofitting old homes or buildings with these devices is advised. 

Common ways of retrofitting include upgrading existing outlets to GFCIs or installing GFCI breakers at the main electrical panel.

GFCIs do not require testing when installed

For the GFCI to work correctly, tests should be performed regularly. 

These include built-in testing buttons that allow you to verify if they are traveling properly while a fault simulation takes place. 

For GFCIs to function correctly, periodic tests must be carried out. 

In addition, GFCIs should be tested after a loss of power or if any suspicion has been raised regarding the fault or malfunction.

Final Thoughts

GFCI outlets are necessary for electrical security, short for Ground fault circuit interrupters. They’re designed to mitigate ground fault, electric shock, and a possible electrical fire. GFCI outlets monitor electrical power consumption in the circuit and immediately shut down if there is a fault on the ground to prevent electric shock injuries. 

It is essential to differentiate between 15 amp and 20 amp circuits, as they differ in their current carrying capacity and the need for various wire gauges. In areas of high power demands, such as kitchens or workshops, 15 amperes are suited to lighting, general supply outlets, and smaller installations, whereas 20 amperes is appropriate for use in these sectors. 

Compliance with local electrical codes and regulations, including the NEC (National Electrical Code), is vital to maintain safety and functionality. Consulting a qualified electrician is advised for proper evaluation and installation.

Can a GFCI outlet fail?

GFCI outlets are made to last for around 10-15 years. But they eventually start to fail after 5 years of installation. If it doesn’t reset after trying multiple times, then it is a sign of failure of GFCI equipment.

What wire is used for GFCI outlets?

Electricians and supervisors prefer 14 and 12-gauge wires for 15A and 20A circuit breakers. 15A and 20A GFCI can be installed on a 20A GFCI.

Reference: GFCI Wikipedia

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