Choosing the ideal size wires for your sub panel is a issue of safety. It different for numerous reasons, yet you generally need 1 AWG copper cable for a 100 amp sub panel. Even if it is it be copper or aluminum, let’s take it a look in ~ what dimension wire you need for a 100 amp sub panel that’s 200 feet away.

*

Table of Contents

Wrapping that Up

Safety Precautions

When performing electrical work in her home, safety should constantly be your optimal priority. Installation wires that are too little to take care of their lots safely can reason overheating, potentially resulting in a fire. Once it concerns larger present that bring 100 amps, simple mistakes can become deadly.

You are watching: What size wire for 100 amp sub panel 100 feet away

Before girlfriend do any kind of electrical work, make certain that you are choosing the exactly gauge wire. This, along with other safety and security precautions, will significantly reduce your risk of injury, damage, or even death. once you room performing electric work, especially on a company panel, friend should always turn off the power greater up the line. In part cases, you may need to contact in her utility firm to shut off the power for you, at the hookups.

Also, if you selected to execute the electric work yourself, you’ll still should schedule an inspection by a certified electrician. This will ensure the the occupational was completed correctly, safely, and complies v code.

Size that the Wire/Conductors

Generally speaking, girlfriend should be able to use 1 AWG aluminum or 3 AWG copper because that 100 ampere circuits. Strength quality can be impacted depending top top what girlfriend choose, for this reason make certain to rise your conductor size to protect against or reduce any kind of potential voltage drop.

You will frequently want to minimize your voltage drop come somewhere about 3% or less of the it is provided voltage. So, because that example, if you have a 240 volt supply, you want the voltage autumn the it is in 7.2 volts or much less to avoid power top quality issues.

How electric Wires room Sized

If you’ve ever before had to shop for electrical wire, you’ve likely seen that there is a wide variety of size and species to select from. Return different varieties of wire are for different uses, learning the appropriate wire size, or gauge, is the an essential to do the correct choice.

The ax “gauge” is provided to describe the physical dimension of the wire. Sized by the American cable Gauge (AWG) system, wires are provided a numerical designation the is opposite of their diameter. This means that the larger diameter, the smaller wire gauge number you’ll have. The most common sizes space 2-, 6-, 8-, 10-, 12-, and also 14-gauge wire.

A wire’s dimension is what determines exactly how much existing it have the right to safely handle. Measure up in ampacity, electrical present has a maximum because that each wire gauge. This method that, depending upon the size of the wire, you’re going to a have actually a various maximum safe transferring capacity.

The bigger the Better

When you’re make the efforts to dimension your electrical wiring, it largely depends ~ above length. Since electrical wires have actually resistance, they i eat lot current. The longer the wire, the much more resistance because of the reality that they must draw more power from the source to with the outlets. Therefore, if you should run wiring for your 100-amp sub panel much longer than 20 feet, girlfriend should consider using a 1-gauge wire.

With the being said, if friend ever uncover yourself stuck in between two various gauge sizes, enlarge is better. If you finish up utilizing too large of a gauge, you will just have spent much more money than you likely needed to spend. However, if your wire gauge is as well small, you will have poor performing circuits and you place yourself at a major risk for electric fire.

What is an electrical Subpanel?

Perhaps you are just gaining started and aren’t quite acquainted with the process and why it is necessary. A subpanel is the secondary circuit breaker panel and it feeds off of her main electric panel. There are two reasons for the installation.

The an initial is that main breaker panel is totally full, allowing no room for any type of potential extr circuits. The second is so the subpanel is there to placed a control point for circuits all in a location that is close come the area that they serve.

How the Subpanel Works

For more recent homes, friend will occasionally see a pair of key subpanels. This each draw their power from the key utility. Store in mind the you will see this in dwellings that have either 300-amp or 400-amp service. This will average either a 200/100 amp break-up or a 200/200-amp split.

In many cases, though, an yes, really subpanel is panel breaker of smaller sized circuit the has all over from 4 slots all the method up come 12. Those slots space fed indigenous the circuit breaker (240 volts) into the main breaker or the feeder breaker.

The subpanel is actually just a smaller version the your main panel. It has actually the same hot bus bars and also ground and also neutral bus bars. The difference is that the subpanel doesn’t have actually a main shutoff circuit breaker. This is as result of the reality that the feeder breaker back in your main panel offers this functionality.

How the Subpanel is Connected

When electricians go with the installation of a subpanel, the procedure usually entails running a feeder cable first starting indigenous the key panel and going to the subpanel. A three-wire cable is usually involved, v a ceiling copper ground wire in enhancement to three insulated conductors.

The electrician will certainly then connect the hot wires to run from the feeder cable come the warm bus bars via the lugs in the subpanel. Lock will additionally connect the neutral cable to the connected bus bar, and the bare grounding copper cable to the bus bar associated to grounding.

Hot Feeder Wires

At this suggest in the process, the electrician will affix those warm feeder wires up to the brand-new 240-volt breaker. After ~ that, they will connect the ground and neutral wires from the feeder cable come their associated bus bars that are located in the main panel.

The last action is to snap the feeder breaker right into one that the open twin slots ago on the main service panel. After every that, the subpanel will be all set to take it on separation, personal, instance circuit breakers because that any added circuits that have to be installed.

Keep in Mind

There space a couple of things to store in mind before going v this process. The an initial is the you desire to feel her panel using four conductors. These room your two warm conductors, the neutral, and the ground. Make certain that you isolation the neutral or grounded conductors as well as the bus bar situated in the secondary panel.

Lastly, make certain that you have actually installed a appropriate grounding electrode system. You will do this at the outbuilding, and also you will bond your grounding connector to this electrode system. For any type of questions, be sure to call a professional. Taking care of electricity can be dangerous, to say the least.

Potential capacity Issues

Generally speaking, you can run throughout one of two capacity worries whenever you are installing your subpanel. The subpanel needs to have the ideal amperage capacity for her area as well as the number of circuits that it will wind up serving.

Secondly, your main service should be sized in such a way that it have the right to sufficiently supply strength for the extr demand that will certainly be carried on by the subpanel. There is a method listed by the National electrical Code because that accurately calculating wattage load and also load requirements for your subpanel.

Older key Service

In the event that you have actually an older key service, miscellaneous of the 60-amp or 100-amp variety, you may need to update to something along the present of 150-amps or 200-amps if you want to have adequate power offered to a newly installed subpanel.

If you suppose the subpanel to be providing circuits come something favor a kitchen remodel with new additional circuits, a room addition, or a brand-new workshop, this is especially true. The inverse need to be fine, but (installing a 60-amp to 100-amp organization with a 200- or 300-amp service currently in place.

See more: What Is A Flower Called Before It Blooms ? What Is A Flower Called Before It Opens

Calling one Electrician

Should you feel uncomfortable v the restrictions or installing the subpanel, phone call an electrician is constantly a clever option. These space experience experts that have done this type of thing plenty of times over. They will certainly ensure the the task is done safely and properly, saving you potential headaches.