this post was submitted on 24 Jun 2024
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The UL one is very applicable.
Chinese motor manufactures will often copy a design (completely rip it off) and make changes to make it even cheaper to manufacture. These make the motor no longer UL compliant. Sometimes these changes lead to it becoming unsafe, but good luck suing a Chinese manufacturer in China if your house burns down. However, they will still put a UL sticker on it and call it a day.
I used to work in motors and turbines and will outright refuse a motor made in China. Always buy motors from US or Mexican manufacturers (inside the US, cannot speak for EU). A good way to find out where the motor was made is looking to see the company that made it - and 100% your HVAC company didn’t manufacture the motor, they bought it from a B2B supplier you likely never heard of.