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For homeowners wishing to increase their electrical capacity or create separate circuits for particular regions of their property, installing a 100 amp sub panel is a typical electrical installation. For safety and the best performance, it is essential to utilise the correct wire size during installation. This article will discuss the importance of selecting the proper wire size for a 100 amp sub panel service, the many types of wires that are available, and installation best practices. Let get started with 100 amp service wire size

Understanding Sub Panel Service

A subsidiary electrical panel that emerges from the main electrical service panel is called a sub panel. It offers extra circuits to transmit electricity across a building to certain rooms or equipment. With less chance of overloading the main panel, householders are able to regulate their power more effectively.

What Size Wire For 100 Amp Sub Panel Service

Importance of Wire Size in Sub Panel Installation

Wire Gauge and Ampacity

The gauge, often known as the size of the wire, establishes its ampacity, or the maximum current it can carry without overheating. The efficiency and safety of the sub panel are directly impacted by the wire gauge selection, which is crucial.

Factors Affecting Wire Size Selection

The length of the wire, the kind of wire material, and the load it will carry are some of the elements that affect the choice of wire size for a 100 amp sub panel. The use of cables that are the wrong size might result in voltage drops, heat accumulation, and even fire risks.

Calculating Wire Size for a 100 Amp Sub Panel

  1. Measure the distance between the main panel and the subpanel location in Step 1 to get the distance.
    Step 2: Calculate the Load: Add up the amperages of all the electronics and appliances that are connected to the sub panel.
    Step 3: Consider Voltage Drop: Based on the wire length and required load, consider the voltage drop and the allowed voltage loss.
    Consult the NEC in Step 4: Based on your estimates, the National Electrical Code (NEC) may propose a certain wire size. Read our latest guide 100 amp service wire size

Types of Wires Suitable for 100 Amp Sub Panel

Copper Wires

Wires made of copper are renowned for their exceptional conductivity and longevity. They are widely favoured because they can transport large currents without experiencing substantial voltage dips. Copper wires are more corrosion-resistant and reasonably simple to deal with.

Aluminum Wires

For certain setups, aluminium wires are a desirable alternative to copper wires since they are more affordable. They must be bigger to make up for the decreased ampacity since they have a lesser conductivity than copper.

Advantages and Disadvantages of Copper and Aluminum Wires

Copper Wire Advantages

Copper Wire Disadvantages

Aluminum Wire Advantages

Aluminum Wire Disadvantages

Best Practices for Sub Panel Wire Installation

Take into account the following recommended practises guaranteeing a secure and effective sub-panel installation:

Hire a Professional Electrician

It’s advisable to work with a licenced electrician who has expertise installing subpanels since installing a sub panel can be a challenging process.

Use Proper Wire Insulation

To protect wires from harm from the environment or unintentional touch, use wires with the proper insulation grades.

Safety Precautions

Before working on any electrical components, switch off the power source first. Additionally, abide by safety precautions to safeguard both you and others when installing.

Common Mistakes to Avoid

Undersized Wires

Using wires that aren’t powerful enough might cause overheating and even fire concerns.

Overloaded Circuits

Electrical failures, equipment damage, and tripped breakers can occur when a sub panel is overloaded with high current.


To sum up, choosing the appropriate wire size for a 100 amp sub panel service is essential to guaranteeing a secure and dependable electrical arrangement. Both copper and aluminium wires have benefits and drawbacks, so homeowners must compare their selections depending on their unique requirements and available funds. Remember that a successful sub panel project requires correct installation and attention to safety regulations.


Q: What is a sub panel?

A: An electrical sub panel is an auxiliary electrical panel that offers circuits that branch out from the main electrical service panel.

Q: Can I use the same wire for the sub panel as the main panel?

A: To prevent overloading the main panel, it is advised to utilise separate cables for the sub panel.

Q: Is it safe to install a sub panel myself?

A: To guarantee a secure and code-compliant installation, it is advisable to use a professional electrician.

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