Choosing the ideal size wires for your sub panel is a matter of safety. It different for number of reasons, but you normally need 1 AWG copper wire for a 100 amp sub panel. Even if it is it be copper or aluminum, let’s take a look at what size wire you require for a 100 amp sub panel that’s 200 feet away.

*

Table of Contents

Wrapping it Up

Safety Precautions

When performing electrical work in her home, safety should always be your peak priority. Installation wires that room too tiny to handle their loads safely can cause overheating, potentially leading to a fire. As soon as it involves larger lines that carry 100 amps, simple mistakes can become deadly.

You are watching: What size wire to run a 100 amp subpanel

Before you do any kind of electrical work, make certain that you are choosing the correct gauge wire. This, together with other safety precautions, will substantially reduce your risk of injury, damage, or even death. as soon as you are performing electric work, specifically on a business panel, you should constantly turn turn off the power higher up the line. In some cases, you might need to contact in her utility firm to shut off the strength for you, at the hookups.

Also, if you selected to do the electrical work yourself, you’ll still must schedule an inspection by a certified electrician. This will certainly ensure that the work was completed correctly, safely, and complies with code.

Size the the Wire/Conductors

Generally speaking, girlfriend should be able to use 1 AWG aluminum or 3 AWG copper for 100 ampere circuits. Power quality can be impacted depending ~ above what friend choose, therefore make certain to boost your conductor dimension to avoid or reduce any type of potential voltage drop.

You will commonly want to mitigate your voltage drop come somewhere approximately 3% or less of the it is provided voltage. So, for example, if you have a 240 volt supply, you desire the voltage autumn the it is in 7.2 volts or much less to stop power quality issues.

How electrical Wires room Sized

If you’ve ever had to shop for electrical wire, you’ve most likely seen that there is a wide variety of size and varieties to choose from. Although different varieties of wire space for various uses, knowing the ideal wire size, or gauge, is the key to making the correct choice.

The term “gauge” is used to explain the physical size of the wire. Size by the American cable Gauge (AWG) system, wires are given a number designation that is the opposite of their diameter. This method that the larger diameter, the smaller wire gauge number you’ll have. The most typical sizes room 2-, 6-, 8-, 10-, 12-, and also 14-gauge wire.

A wire’s dimension is what determines just how much current it can safely handle. Measured in ampacity, electrical present has a maximum for each cable gauge. This method that, depending on the dimension of the wire, you’re going to a have actually a various maximum safe delivering capacity.

The larger the Better

When you’re make the efforts to size your electric wiring, it mainly depends top top length. Because electrical wires have actually resistance, they eat up current. The much longer the wire, the much more resistance due to the fact that they need to draw more power native the resource to with the outlets. Therefore, if you should run wiring for your 100-amp sub panel longer than 20 feet, friend should think about using a 1-gauge wire.

With the being said, if girlfriend ever find yourself stuck in between two various gauge sizes, bigger is better. If you end up using too large of a gauge, you will just have spent much more money 보다 you likely needed to spend. However, if your wire gauge is too small, you will have poor performing circuits and you location yourself in ~ a major risk for electrical fire.

What is an electric Subpanel?

Perhaps you are just acquiring started and aren’t quite acquainted with the process and why that is necessary. A subpanel is the secondary circuit breaker panel and it feeds turn off of your main electric panel. There room two factors for the installation.

The first is that key breaker dashboard is entirely full, allowing no room for any kind of potential added circuits. The second is for this reason the subpanel is over there to placed a control suggest for circuits every in a place that is close to the area that they serve.

How the Subpanel Works

For newer homes, you will sometimes see a pair of key subpanels. This each attract their strength from the main utility. Keep in mind the you will watch this in residences that have either 300-amp or 400-amp service. This will typical either a 200/100 amp separation or a 200/200-amp split.

In many cases, though, an really subpanel is dashboard breaker of smaller circuit that has all over from 4 slot all the means up come 12. Those slots room fed indigenous the circuit breaker (240 volts) into the main breaker or the feeder breaker.

The subpanel is actually just a smaller sized version that your main panel. It has actually the same warm bus bars and also ground and also neutral bus bars. The difference is the the subpanel doesn’t have actually a main shutoff circuit breaker. This is due to the fact that the feeder breaker ago in your key panel offers this functionality.

How the Subpanel is Connected

When electricians go with the surroundings of a subpanel, the process usually requires running a feeder cable first starting indigenous the main panel and also going to the subpanel. A three-wire cable is normally involved, with a bare copper ground wire in enhancement to three insulated conductors.

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

Hot Feeder Wires

At this allude in the process, the electrician will connect those hot feeder wires approximately the brand-new 240-volt breaker. After that, lock will affix the ground and also neutral wires indigenous the feeder cable come their linked bus bars the are situated in the main panel.

The last action is to snap the feeder breaker right into one of the open twin slots ago on the main company panel. After every that, the subpanel will certainly be ready to take on individual circuit breakers for any added circuits that have to be installed.

Keep in Mind

There are a few things to store in mind prior to going v this process. The first is that you want to feel her panel using 4 conductors. These space your two hot conductors, the neutral, and also the ground. Make sure that you isolation the neutral or base conductors and also the bus bar situated in the second panel.

Lastly, make certain that you have actually installed a appropriate grounding electrode system. You will perform this in ~ the outbuilding, and you will bond your ground connection connector come this electrode system. For any type of questions, be certain to contact a professional. Dealing with electricity can be dangerous, to say the least.

Potential volume Issues

Generally speaking, you might run throughout one of 2 capacity concerns whenever you are installing your subpanel. The subpanel has to have the proper amperage capacity for your area and the variety of circuits the it will wind up serving.

Secondly, your main service should be size in together a means that it can sufficiently supply power for the added demand that will be brought on through the subpanel. There is a method noted by the National electric Code because that accurately calculating wattage load and load needs for her subpanel.

Older key Service

In the occasion that you have an older key service, something of the 60-amp or 100-amp variety, you might need to upgrade to something along the lines of 150-amps or 200-amps if you want to have adequate power supplied to a newly mounted subpanel.

If you suppose the subpanel come be giving circuits to something prefer a kitchen remodel with brand-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 come 100-amp service with a 200- or 300-amp service already in place.

See more: 10 00 Am Pdt To Est Converter

Calling an Electrician

Should you feel uncomfortable through the restrictions or installation the subpanel, call an electrician is constantly a smart option. These are experience professionals that have done this kind of thing numerous times over. They will ensure the the job is excellent safely and properly, conserving you potential headaches.