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Low Voltage Wire Gauge Chart

By Benjamin Strusnik March 15, 2023

Low voltage wires are incredibly important, as they are used for a variety of electrical applications from ceiling lights to even carrying internet signals through your home. So if you want to make sure you have the right equipment, you need to have a low-voltage wire gauge chart close at hand.

Not every low-voltage wire is identical to the others. The type and size of low voltage wires will change depending on the application it is being used for and selecting them can be a bit of a tricky task for novices.

Thankfully this is where low-voltage wire gauge charts come into play. They are an essential tool for anyone working with low-voltage electrical systems and makes selecting a wire incredibly easy.

Choosing the right low-voltage wire is crucial to ensure safety, reliability, and a proper flow of electricity. When buying any form of low-voltage wire, it's wise to become familiar with the application you’re going to use it for.

In this article, you will learn how to properly navigate a low-voltage wire gauge chart and select the best wire for your required electrical needs.

What Is a Low Voltage Wire

As we mentioned, low voltage wiring is used all over the household. They are commonly used for doorbells, televisions, security systems, common household lighting, and DIY solar panel kits for home use.

low voltage landscape wire chart

Low voltage wires typically carry voltages that are lower than the standard voltages used for household or building electrical systems. To give you a rough idea, standard household outlets have a voltage of 120 volts and low-voltage wires will carry significantly less.

Generally, low-voltage wires will only carry voltages that are 50 volts or less. However, this number can change depending on the electrical requirements. You will find that low-voltage wires are significantly smaller in size compared to other electrical wiring that carries high voltages.

Low-voltage wiring has a lower risk than normal wiring, but it could still be dangerous. If low-voltage wires are improperly grounded or insulated, electrical shock can still happen, and appliances can still be damaged.

To save yourself from improper usage you should always consult a professional from Shop Solar Kits. We can give you quality advice on low-voltage wiring setups for solar systems, as well as assist you in the installation process.

What Is a Low Voltage Wire Gauge Chart

Whenever it comes to selecting and setting up wiring for an electrical circuit, one should always utilize a gauge chart. It is similar to a battery cable ampacity chart, but instead of telling you the size of the battery needed, it will tell you the size of the wire needed.

low voltage wire chart

A low-voltage wire gauge chart works as a reference tool for determining the proper wire gauge to use for low-voltage electrical systems.

All electricians will make use of this chart to determine the wire size needed based on several features. These features include the required current, the distance between the power source and the appliance, and the voltage drop requirements.

The wire gauge or size is represented by a numeric value. The smaller number represents thicker wires, while higher numbers represent thinner wires. Generally, thicker wires carry huge current loads over a longer distance without experiencing significant voltage drops.

The chart itself is represented in a table format with the American Wire Gauge (AWG) sizes in the middle. You will also find the maximum current the wires can efficiently carry without damage, and the distance the wire will be carrying the current.

Some charts might also include the insulation material of the wires, as well as the temperature ratings for each wire.

The low voltage lighting wire size chart is used by electricians, engineers, and do-it-yourselfers to choose the right wire size for their projects, ensuring that the system performs safely, effectively, and consistently.

Typical 12V Wire Gauge Chart

The table below consists of AWG (American Wire Gauge) sizes according to current and length in feet. You just need to consider these two things to decide what size cable you require.

low voltage wire size chart

For example, if your system has a current of 20 amps at 240 Watts and the wire needs to run a distance of 15 Ft, then you would need a cable size of 10 AWG to carry the current efficiently.

You can choose the appropriate battery cable for your solar panel system, RV, or watercraft using the table below. Keep in mind that choosing the right size is essential for your system to operate properly.

As you can see, the cable size is determined by the battery's charge capacity (current) and the distance between it and the power source. To ensure that the cable can withstand an increasing flow of current, the cable must ultimately be thicker the larger the battery's capacity.

 

Current (A) ➡️

Length in Feet

⬇️ 

5 Amp (60W)

10 Amp (120W)

15 Amp (180W)  

20 Amp (240W)

25 Amp (300W)

30 Amp (360W)

40 Amp (480W)  

50 Amp (600W)  

60 Amp (720W)

15 Ft

16 AWG

12 AWG

10 AWG

10 AWG

8 AWG

8 AWG

6 AWG

6 AWG

4 AWG

20 Ft

14 AWG

12 AWG

10 AWG

8 AWG

8 AWG

6 AWG

6 AWG

4 AWG

4 AWG

25 Ft

14 AWG

10 AWG

8 AWG

8 AWG

6 AWG

6 AWG

4 AWG

4 AWG

2 AWG

30 Ft

12 AWG

10 AWG

8 AWG

6 AWG

6 AWG

4 AWG

4 AWG

2 AWG

2 AWG

40 Ft

12 AWG

8 AWG

6 AWG

6 AWG

4 AWG

4 AWG

2 AWG

2 AWG

1 AWG

50 Ft

10 AWG

8 AWG

6 AWG

4 AWG

4 AWG

2 AWG

2 AWG

1 AWG

1/0 AWG

60 Ft

10 AWG

6 AWG

6 AWG

4 AWG

2 AWG

2 AWG

1 AWG

1/0 AWG

2/0 AWG

70 Ft

10 AWG

6 AWG

4 AWG

2 AWG

2 AWG

2 AWG

1/0 AWG

2/0 AWG

2/0 AWG

80 Ft

8 AWG

6 AWG

4 AWG

2 AWG

2 AWG

1 AWG

1/0 AWG

2/0 AWG

3/0 AWG

90 Ft

8 AWG

4 AWG

4 AWG

2 AWG

1 AWG

1/0 AWG

2/0 AWG

3/0 AWG

3/0 AWG

As we can see from this table, there are a number of different applicable wire gauges you can use for your system. A good place to start is with our 8 Gauge (AWG) wire for solar systems. It’s a good middle-of-the-road option that works for many solar setups.

low voltage cable gauge chart

Conclusion

Finding the correct wire size for your low voltage cables can be a daunting task, especially if you aren’t given any help in how to navigate wire gauge voltage charts. Nevertheless, now that you know how to choose the right cable size for any low-voltage situation, you can do it with ease.

To ensure that energy flows through the cable, the right size wire is essential. The proper cable sizing will help stop frequent performance issues like voltage drop, overheating, and electrical fires.

Low-voltage wire gauge charts are essential to anyone trying to work out cable sizes for low-voltage electrical systems, especially household circuits.

Hopefully, you have fully grasped the applicational use of these charts in determining wire size and are comfortable enough to use them on your own.

There are many different sizes of low-voltage wires available on the market. The best selection of these wires can be found at Shop Solar Kits. We are well-versed in low-voltage solar systems and will give you the best advice on wire selection and installation.

If you do plan on installing a solar panel system in your home, then you should familiarize yourself with a solar wire size calculator and battery cable size charts.

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