When installing the #4 AWG copper wire in the sub panel, you should take the necessary steps to secure the wire from any unwanted occurring. Generally, these two wires have the amperage and Gauge rating that is ideal and suitable for the sub panel. However, the ideal and recommended wires for the 100amp sub panel to power up a medium-sized house is the #4 AWG or #2 AWG aluminum wire. There is a variety of wires available to use in a 100 amp sub panel. Generally, the NEC rule indicates that the wire should not hit more than 80% of its electric supply.Ĭonsidering that, you need to follow the rules and regulations properly to power your house using a 100 amp sub panel. The NEC rule provides us with the proper guideline regarding any electrical work and eases the effort. In addition to that, you should always follow the NEC rule when choosing the wire for a sub-panel.
You need to choose the right type of wire for your electrical sub panel.īecause choosing the wrong wire may not be able to suit the electric flow and cause a lot of nuisances. Generally, wiring is one of the most essential parts of electrical work that is being done to ensure proper power supply throughout the house. You should make sure that the wire you are using to run 100 amps up panel should be sufficient to the amperage of the sub panel to provide you with proper electricity flow. Generally, the wire that is suitable to run a 100amp subpanel is #4 copper wires or #2 aluminum wires. Generally, a 100 amp sub panel requires #4 copper wires or #2 aluminum wires. When choosing the wire for a 100 amp subpanel, you need to make sure that the wire gorge is sufficient for the amperage of the sub panel. Generally, the #4 AWG has 85A ampacity but should conduct at most 68 amps. It is ideal to wire the circuit to hit 80% ampacity. Good luck.When running the subpanel, you should never put the circuit under 100% ampacity. I hope this helps or at least sheds some light on what you are trying to do. So once again take some time and think about what you need.
100 amp sub panel wire size chart full#
If you are calculating full load then the grounding conductor must take voltage drop into account and rise a full two sizes more just like the current carrying conductors or a #4 cu or #2 al. A 100A breaker would require a #8 cu or a #6 al. Your grounding conductor must be run also and it is sized to the breaker also. If there are some 240V loads then yes but we have to know how much will be permanent.
I would suggest you take a good look on how much power you are going to use and think about what size feeder you are going to need.Īs far as whether you can reduce a neutral once again we have no knowledge as to what type of equipment you are using. Which is why I mentioned a 70A feeder which would also reduce your cost. Conductors a few size larger can become rather expensive. The main reason for you to consider this is the cost of material. If the answer is yes then you will be able to stay at the original size. If the answer is no I want to use the full 100A then you feeder would have to be raised 2 sizes to make up for the voltage drop to a #1 cu or 1/0 al. If you don't have that information then would it be safe to assume that you are using the 80% rule on your feeder size? Meaning you are only going to load your circuit to 80% under normal circumstances. Voltage drop is calculated using your power demand or all of the electrical equipment, lights, devices, and appliances you are planning to use at one time. Of course none of this takes voltage drop into consideration.
100 amp sub panel wire size chart install#
If you install a 70A breaker then you can reduce your conductors to #4 cu or #3 al. Are you planning to protect the circuit with a 100A breaker? If the answer is yes then you need to run at least #3 Copper or a #1 Aluminum conductors. A circuit size is defined by the overcurrent protection not the of the equipment attached to it.
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