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HayZee,
I just saw you wrote about a derating rule (more than 3 condutors through a joist). Is this a concern in a project like I mentioned above? I never thought have more than 3 conductors through a joist will cause heat damage. I understand for industrial/commercial but residential? Is this a code?
Also you said 4 awg AL service for 100A or 2/3 copper. What do you mean by 2/3? Copper can take a high current than al for same gauge, I would think 6awg copper if AL can be 4.
Last edited by DKAudio; 03-17-2008 at 05:06 PM.
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