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How Many Breakers Can I put in a 100 Amp Panel?

Written by Edwin Jones / Fact checked by Andrew Wright

how many breakers can i put in a 100 amp panel

Do circuit breakers leave you confused when installing them in an amp service panel? The following information will help you learn how vital these breakers are when managing the power load that goes throughout the building.

The panel’s ampere and the number of breakers combined are a huge part of a home system. Asking yourself how many breakers can I put in a 100 amp panel will help you use electrical energies safely and efficiently. In general, the panel’s instructions will tell you its maximum number of breakers.

The 100-Amp Service Panel


Also known as a medium-sized service panel, a 100 amp service panel is a kind of electrical device used in most homes. The National Electric Code (NEC) required this as the minimum panel amperage due to the increasing power needed by appliances.

This type of electrical service panel provides enough power for homes that contain appliances with a 240-Volt requirement.

Before installing breakers to suit a 100-amp panel, you have to make sure you really have a 100A panel first. To determine if your house has a 100-amp service, you can look for the meter installed outside by the utility company. You can probably say that it’s a 100-amp service if the meter is protected by a glass dome attached to a square base.

This electrical panel works as the receiver of electricity coming from your service provider. Then, it distributes the energy through the hot wires of circuit breakers and finally into an electric device.

An example is the 16-circuit indoor load center Square D by Schneider Electric HOM816M100PC made of aluminum, specifically made for residential or commercial power diffusion. Similarly, you can also check out the GE PowerMark Gold for more circuit space (32 circuits).

In terms of placing an electric panel, you should remember to put it in a secluded area in the house where there are fewer people. NEC advises placing the main breaker where it is easy to reach and see. If there’s an emergency, cutting the power off shouldn’t be a problem.

How Many Circuit Breakers Can a 100 Amp Panel Handle?


For safety, check the instruction of your panel to see how many breakers it can handle.

Typical 100-amp panels have 20 circuits, meaning they can handle 20 full-sized breakers. 20/24 panels can hold 16 full-sized and 4 twin breakers (24 circuits in total).

The number of breakers can max out to 30-42, too, depending on the design of your 100-amp pane. However, NEC prohibits more than 42 circuits, so you can only choose between 20-42 breakers for a 100-amp panel.

Breakers or circuit breakers act as a switch for cutting off power from the main electrical supply. They also serve as a safety mechanism to avoid fires or electrical hazards in an energy spike.

The following are essential things you need to know regarding a circuit breaker panel. The panel contains these parts for supplying power and protecting the wirings at the same time.

Main Circuit Breaker


Located on either the top, bottom, or side of the breaker box, this is the central control of all individual circuits connected to the panel. This is a switch to disconnect the electricity from the powerlines outside your house.

Types of Circuit Breaker


There are two types of circuit breakers: single-pole and double-pole. Each was specialized to prevent an electrical circuit from drawing or utilizing greater voltage than it was intended to.

Single-pole breakers consist of one hot wire and one neutral wire, commonly used in several general appliances. Double-pole breakers are composed of two hot wires connected to one neutral wire that serves high and low voltage devices.

If a single-pole overloads, the circuit trip only happens on that one breaker. With double poles, both circuits will trip if something ever goes wrong within any pole’s wire.

Bus Bars


Often identified as strips of copper, brass, or aluminum, bus bars ground and conduct the electricity inside the panel board. Their primary purpose is to carry an incredible amount of electric current.

Arc-fault Circuit Interrupters


These detect electric arcs, which are signs of loose connections in home wirings, and immediately cut the power off. These electric arcs may worsen over time and can get super-hot and set the house on fire.


These are used for extending circuits in more expansive areas which are distant from the main panel. They function as separate mini circuit breakers to provide additional wiring protection.

Electrical Load Capacity of a 100-Amp Panel

100 amp panel capacity

In a home with a 240V service, the maximum 100 amp panel capacity is up to 24,000 watts. Because loads of heavy-consuming electrical appliances may result in a circuit trip, you need to know how to manage the available capacity to avoid big problems.

Always keep in mind that every appliance’s amperage load should not exceed 80% of the electrical service panel, which in this case is 100 amperes. If it exceeds this percentage, the overloading of an electrical panel may occur.

For small-sized homes of 2,000-2,500 sq. ft. with regular electric appliances such as a TV and dishwasher, a 100-amp service is no problem. On the other hand, a bigger load capacity is necessary for devices with powerful electric pull like air conditioning and heat-air systems.


Asking oneself how many breakers can I put in a 100 amp panel is an excellent method to become familiar with one’s own housing electricity.

Depending on how the 100-amp panel was manufactured, you can install breakers between 20-24 (minimum) and 30-42 circuits (maximum). If the 32-space model is what you need, a circuit panel like GE PowerMark Gold is efficient.

Always prioritize safety and remember to keep good quality of the panel box’s parts: main circuit breaker, bus bar, AFCI, and sub-panels.

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