Estimated reading time: 2 minutes
Mike Holt [video] discusses bonding frames for ranges, ovens, and clothes dryers. The National Electrical Code (NEC) has some important guidelines to follow. See NEC 250.140.
First off, safety is our top priority. That’s why the NEC requires an equipment grounding conductor for these appliances. It must connect directly to the frame—not the neutral terminal. I can’t stress this enough!
Now, you might run into some tricky situations. Manufacturers sometimes ship appliances with the grounding conductor connected to the neutral, which is a no-go according to the code. Keep an eye out for this, especially with dryers.
Here’s an update: the 2023 NEC now requires GFCI protection for ranges and dryers. If that grounding conductor isn’t connected correctly, you’ll know immediately because the GFCI will trip as soon as you plug it in. Not all areas may have adopted this requirement yet, so checking your local codes is essential.
Older Homes
What about older homes? There’s an exception for legacy systems. If there’s no equipment grounding conductor in the outlet box, it’s okay to connect the frame to the neutral using a three-wire cord. But remember, this is only for existing installations.
Interestingly, this practice of connecting grounds and neutrals dates back to World War II. It was a temporary solution due to a copper shortage but lasted until the 1990s.
We’re now using four-wire systems for new installations. Separate equipment grounding and neutral conductors are the preferred methods. Many technicians and even manufacturers are still following outdated practices. It’s our job to catch these potential safety hazards. Stay vigilant and safe out there, and don’t hesitate to educate homeowners about these necessary electrical standards.
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