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Old 06-07-2011, 07:56 PM   #31
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How to install a 100 Amp subpanel


I just had a conversation with a local electrician that will view my project soon and he recommends using Aluminum # 4, with 4 wire cable to feed my sub-panel? He also would use the 60 amp double pole breaker in the main panel as we were planning to use. I have been looking at the 6/3 NM-B cable to use as a feeder cable. Not sure what the difference between copper and aluminum is? I guess there is a cost savings? Would you recommend using copper or aluminum? Just curious of what is the general practice. Thanks again.

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Old 06-07-2011, 09:40 PM   #32
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How to install a 100 Amp subpanel


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I just had a conversation with a local electrician that will view my project soon and he recommends using Aluminum # 4, with 4 wire cable to feed my sub-panel? He also would use the 60 amp double pole breaker in the main panel as we were planning to use. I have been looking at the 6/3 NM-B cable to use as a feeder cable. Not sure what the difference between copper and aluminum is? I guess there is a cost savings? Would you recommend using copper or aluminum? Just curious of what is the general practice. Thanks again.
I don't know the prices on the smaller sizes like that, but let's put it this way. The difference between copper and aluminum for my 30' garage feeder at 100 amps was the difference between $100 and $360.
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Old 06-07-2011, 09:47 PM   #33
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How to install a 100 Amp subpanel


Was the $100 for aluminum and $360 for copper? The electrician told me the aluminum # 4 was $1.25 a foot. The 6/3 NM-B was $2.00 a foot. Is aluminum as good as copper or is it not worth the savings? How about safety?
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Old 06-07-2011, 09:54 PM   #34
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How to install a 100 Amp subpanel


Aluminum is just as good as copper. The difference is the ampacity for the same size wire as you already know. The service to your home is aluminum.
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Old 06-08-2011, 08:00 AM   #35
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How to install a 100 Amp subpanel


Thanks again for all of the support with this project, I appreciate it. I had to refresh my memory and took another look at the ampacity chart. Looks like #6 copper and # 4 aluminum are rated the same. So if I use copper #6 or aluminum #4, it will give me exactly the same ampacity and should be plenty to feed my sub-panel. And I would be able to save some money on the wire, which is always a good thing.

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