U-Number Question

By Andrew Gibson; posted May 21, 2010

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I picked up a pair of porcelain insulators recently, and I'm trying to figure out what the U numbers are on them. I'm pretty sure that they are U-231 and/or U-232, but I was hoping someone might be able to verify for me. I can't figure out if they are the same U number (and just different trimming profiles), or if they really are different U numbers. Thanks for any help!