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crazy electrical sh.....
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<blockquote data-quote="4x4dually" data-source="post: 1272564" data-attributes="member: 4100"><p>Something I've also noticed when working on these older farm houses....just because the screw on a lug is tight, doesn't mean it is tight on the wire. Typically when folks put copper wire into an aluminum lug, they corrode over time due to dissimilar metals. The corrosion makes you think the set screw is tight, and it is as far as the wrench is concerned, but it might not be tightening down on the wire. What sucks is, most of these old panels will break if you try to touch the set screws. Be careful. If you can, take the neutrals loose, cut and re-strip the ends, and re-terminate. </p><p></p><p>If you have a partial neutral connection, it may be able to pass 0 to say 30 amps just fine. If your panel is balanced for the most part, and you pull 60 amps from phase 1 and 50 amps from phase 2, then the neutral only has to carry 10 amps. Your 220 VAC stuff should have almost no current on neutral. Therefore, you might only be seeing this problem when the panel gets unbalanced due to your 120 VAC stuff being mostly on one phase or the other with very little demand on the other side. </p><p></p><p>I know, it is single phase, but there are still two. That whole debate infuriates me. LOL</p></blockquote><p></p>
[QUOTE="4x4dually, post: 1272564, member: 4100"] Something I've also noticed when working on these older farm houses....just because the screw on a lug is tight, doesn't mean it is tight on the wire. Typically when folks put copper wire into an aluminum lug, they corrode over time due to dissimilar metals. The corrosion makes you think the set screw is tight, and it is as far as the wrench is concerned, but it might not be tightening down on the wire. What sucks is, most of these old panels will break if you try to touch the set screws. Be careful. If you can, take the neutrals loose, cut and re-strip the ends, and re-terminate. If you have a partial neutral connection, it may be able to pass 0 to say 30 amps just fine. If your panel is balanced for the most part, and you pull 60 amps from phase 1 and 50 amps from phase 2, then the neutral only has to carry 10 amps. Your 220 VAC stuff should have almost no current on neutral. Therefore, you might only be seeing this problem when the panel gets unbalanced due to your 120 VAC stuff being mostly on one phase or the other with very little demand on the other side. I know, it is single phase, but there are still two. That whole debate infuriates me. LOL [/QUOTE]
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