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Joined: Jul 2007
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I typically use compact aluminium SER just for feeders. In residential, strictly copper in comerical.
"Live Awesome!" - Kevin Carosa
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Joined: Oct 2006
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We still see circuits for heat pumps/AC units and electric furnaces wired with aluminum SE cable here. This is especially true in newer construction. I haven't checked the price difference between 2/3 SEU in copper vs: aluminum in quite some time. Copper seems to be the norm for ranges and dryers though.
---Ed---
"But the guy at Home Depot said it would work."
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Joined: Mar 2004
Posts: 947
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One thing a lot of people seem to ignore is that most lugs are aluminum. It would seem (as Alcan, among others will say) aluminum wire performs better in these lugs than copper. Tin plated, I think.
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Joined: Jul 2004
Posts: 9,928 Likes: 34
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Not the ones I see. They are solid aluminum alloy. Scratch one and see.
Greg Fretwell
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Joined: Oct 2006
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The only tin plated ones that I've ever seen are copper and are only rated for copper conductors. They are just copper lugs that look silver.
---Ed---
"But the guy at Home Depot said it would work."
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Joined: Jan 2004
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I have never seen a contactors in an air conditioner condenser that is suitable for Aluminum wire terminations or for that matter a cooking appliance. That's why the cooking appliances have whips and the air conditioners are wired to the disconnect with Aluminum and the whip from the disconnect to the condenser is copper. I've not seen any contactors that say suitable for aluminum wire. Maybe I've led a sheltered life but I doubt it.
George Little
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Joined: Jul 2004
Posts: 9,928 Likes: 34
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I agree, I was talking about the "CU/AL" lugs and bus bars in the panelboard where feeders land.
Greg Fretwell
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Joined: Mar 2004
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Joined: Jan 2004
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There are numerous situations where the equipment will specify "Copper conductors only". I've had inspections where the contractor will install a lug that is CU/AL rated and attempt to use Aluminum wire. Won't pass under my watch. I recently (about 3 mo. ago) had a steamer made by Jucuzzi that specified 105° Copper wire for the hook up to the appliance. Contractor had to hustle around and find said wire in #6 awg.
George Little
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Joined: Feb 2001
Posts: 308
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Did the topic change or am I misunderstanding the replies?
Can someone give me an example of applying section 110.5? Why is it in the code?
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