expired Posted by hot_stuff • May 16, 2025
May 16, 2025 5:21 AM
Item 1 of 5
Item 1 of 5
expired Posted by hot_stuff • May 16, 2025
May 16, 2025 5:21 AM
2-Pack 2' KMC 3-Outlet Power Extension Cord
$6.45
$13
50% offAmazon
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Hrmmm....
Hrmmm....
Bad cord?
Hrmmm....
And so is your standard socket.
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Ahh, stranded. Yeah, didn't think about that.
When it comes to electrical safety certification in North America, ETL and UL are two of the most commonly seen marks, and they are often misunderstood as being different in terms of rigor or meaning. In truth, both ETL and UL are Nationally Recognized Testing Laboratories (NRTLs) approved by OSHA, and they test products to the same consensus safety standards (like UL 508, UL 67, etc.).
UL (Underwriters Laboratories):
One of the oldest and most recognized safety certification organizations (founded in 1894).
Develops many of its own standards, which have been adopted industry-wide.
A UL Listing mark means the product has been tested to UL's own published standards.
UL also conducts follow-up inspections at manufacturing sites to ensure ongoing compliance.
ETL (originally Edison Testing Laboratories):
Founded by Thomas Edison in 1896, now operated by Intertek.
ETL tests to the same UL, ANSI, or CSA standards, not its own.
Also does regular factory audits to maintain compliance.
ETL certification is often faster and less expensive to obtain than UL, making it a popular choice among manufacturers.
Which One Should You Choose or Trust?
Both are equally valid. If you are:
A homeowner or installer: Either mark means the product meets the required safety standards.
A manufacturer: ETL might save you money/time, but some AHJs (Authorities Having Jurisdiction) are more familiar with UL and may request clarification.
An inspector: As long as it's an NRTL mark (ETL, UL, CSA, etc.) and it lists the applicable standard, it is generally compliant.
Bottom Line:
UL and ETL both certify products to the same safety standards. One is not safer than the other. The choice often comes down to brand recognition, cost, and speed of certification — not safety or compliance.
NEMA 5-20 (with the one 'sideways' blade) is required for 20A.
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