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<blockquote data-quote="pm-r" data-source="post: 1607248" data-attributes="member: 175845">I can't find my AC extension cord for my MBPro power adapter with the duckhead connector, but I recall questioning and checking out previously as to why it had a U-Ground plug and I never did find a logical reason or explanation.There was no electrical connection for the ground at the adapter&nbsp; as I recall, and all I could think of is that it was used to keep the polarity of the AC pins, neutral being at the same potential as the ground back at the breaker panel, but that didn't make sense as when the duckhead adapter is used by itself, the AC connectors aren't even polarized.So just a go figure thing I guess.... or maybe it's due to some UL or CSA regulation when a cord is used or...????No further word back from the OP, so I hope he's OK or satisfied with the posts to his question.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" /></blockquote>

[QUOTE="pm-r, post: 1607248, member: 175845"] I can't find my AC extension cord for my MBPro power adapter with the duckhead connector, but I recall questioning and checking out previously as to why it had a U-Ground plug and I never did find a logical reason or explanation. There was no electrical connection for the ground at the adapter as I recall, and all I could think of is that it was used to keep the polarity of the AC pins, neutral being at the same potential as the ground back at the breaker panel, but that didn't make sense as when the duckhead adapter is used by itself, the AC connectors aren't even polarized. So just a go figure thing I guess.... or maybe it's due to some UL or CSA regulation when a cord is used or...???? No further word back from the OP, so I hope he's OK or satisfied with the posts to his question. ;) [/QUOTE]

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