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Electrical Question From Brian About 220 Volt Wiring

Question: Can I use 6awg THHN wire to run a welder with 220 volts rated at 70 amps max? With a run of 50 feet in 3/4 conduit.


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Electrical question about: 220 Volt Wiring

Received from a Homeowner in Sallis, Ms

[ad#block]Question: Can I use 6awg THHN wire to run a welder with 220 volts rated at 70 amps max? With a run of 50 feet in 3/4 conduit.

Thanks Dave

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Complete Guide to Home Electrical Wiring

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Handyman, Handy Women, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
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The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

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This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
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Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
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The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.


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FAQs Frequently Asked Questions and Comments

2 Responses to “Electrical Question From Brian About 220 Volt Wiring”
  1. darome says:

    I just looked at my electrical current ratings protect book and i found that # 6 wire is only rated for 65 amps. So according to this #4 is the correct size because it will protect your equipment and not melt or burn so quick. # 4 wire is rated for 85 amps that’s plenty of overcurrent protection.

  2. Dave Rongey says:

    Hey Darome, Thanks for your input. This was one of those questions that got posted without my reply, and I love seeing other get involved here. I double checked my NEC Table 310-16 and you are correct.

    Thanks again Darome, visit anytime. I have a backlog of several hundred questions here in the blog that are not even posted, and another 2000+ in another database, so I can use all the help I can get. If you are an electrician and want to participate then Please Do! If you have a website for your own business I will be more than happy to link to it as you help with any of these questions.