File:Surge Universal 71632 1998 testing polaritygrounding 01.jpg
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Universal 71632 undergoing electrical testing with a receptacle tester. The illuminated pattern indicates correct outlet wiring and proper grounding.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:47, 20 September 2026 | 715 × 1,600 (237 KB) | PowerPig (talk | contribs) |
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