WireGaugeCalc Free calculator · NEC cited · works offline
200 Amp Service Ground Wire Size
200 amp service ground wire size is quick with WireGaugeCalc, since you enter the service rating and material and the tool returns the grounding conductor.
The calculator separates the grounding electrode conductor from the equipment grounding conductor, so you size each one correctly for a 200 amp service.
You get the right copper or aluminum gauge in seconds, so the service grounds properly the first time.
Open the calculatorSmallest conductor whose ampacity meets the load, NEC Table 310.16. Field aid only, verify against the current NEC and your local authority having jurisdiction.
How the ground wire size 200 amp service is set
The grounding electrode conductor is sized from the service conductors, since a larger service generally calls for a larger ground.
For a 200 amp service the grounding electrode conductor is commonly 4 AWG copper, while the connection to a ground rod is often allowed at 6 AWG copper.
WireGaugeCalc returns the ground wire size 200 amp service requires for your material, so you do not guess between the rod and the water pipe.
What the size of ground wire needed for 200 amp service depends on
Several details decide the final grounding conductor:
- Service rating, 200 amps in this case
- Conductor material, copper or aluminum
- Grounding electrode conductor versus equipment ground
- Which electrode the conductor connects to
- Whether the conductor is sole connection to a ground rod
- Any continuous metal raceway protecting the conductor
One app for every NEC calculation
WireGaugeCalc keeps the calculations you reach for most in one place:
- Voltage drop and wire sizing for any run
- Conduit fill for EMT, PVC, and RMC
- Box fill and junction box sizing
- Ampacity and temperature derating
- Motor circuit and load calculations
- Conduit bend offsets and saddles
Built for the field, works offline
The whole app runs on your phone, so it keeps working in a basement, an attic, or a job site with no signal.
There is no account to create and nothing to load. Open it, run the number, and get back to work.
- No signup and no signal needed
- Answers in a tap, not a spreadsheet
- Same tool on phone, tablet, and desktop
Every result cites the NEC article
Each answer shows the table or formula it came from, so you can check the method and learn the code as you go.
That makes the app useful on the job and during exam prep, since the reasoning is right next to the number.
Switch the code year your job runs on
Jurisdictions adopt the NEC at different times, so you can match the calculation to the code in force:
- NEC 2017, 2020, and 2023 tables
- Copper and aluminum conductors
- 60, 75, and 90 degree C terminations
- Single-phase and three-phase systems
Run the number, then get back to work
Stop flipping through a paper book or hopping between calculator sites. Enter your values, read the code-cited answer, and move on. Free to use, no signup.
Open the calculatorFrequently asked questions
Is the 200 amp ground wire size the same for copper and aluminum?
No. Aluminum needs a larger gauge than copper for the same grounding duty, so the calculator gives a different result for each material. Pick the conductor you are actually installing before you read the size.
Can I use 6 AWG to a ground rod on a 200 amp service?
Often yes, since the conductor to a single made electrode like a ground rod is limited and 6 AWG copper is commonly accepted for that run. The grounding electrode conductor to other electrodes is usually larger, so confirm both against the current NEC and your local authority having jurisdiction.
Is WireGaugeCalc free to use?
Yes. Every calculator is free to run with no signup. A paid tier adds saved projects, PDF reports, and extra code years, but the core math stays free.
Does it work without internet?
Yes. The app runs on your device, so it keeps working with no signal on a job site, in a basement, or in an attic.
Are the results code accurate?
Results follow published NEC tables and standard formulas, and each answer shows the article it came from. It is a field aid, not a stamp of approval, so verify against the current code and your local authority before you wire anything.
Which NEC code year does it use?
You can switch between NEC 2017, 2020, and 2023, since jurisdictions adopt the code at different times. Pick the year your job runs on.