Please confirm my code compliance - wire size with transition.

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KaBoom!

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I have to get a feeder to a new unattached garage. There is an existing 1" PVC pipe going under the patio for me to use. I would like to install as large of a feeder as I can.

My plan is to run #4 aluminum SER from the main panel thru the basement to an outdoor box in which I splice into #6 THWN running thru the 1" PVC.

Both the #4 AL and #6 copper have an allowable ampacity of 65A which means I should be able to use a 70A feeder (assuming that the load is much less than 65A).

Is this all correct?
 
infinity said:
Why can't you use larger conductors in the PVC?
Click to expand...
I could squeeze #4’s but I have always upsized underground pipe and I am not sure how many bends the installer put in this run.

I figure 70A will be good, if what I proposed is infact compliant.
 
KaBoom! said:
Both the #4 AL and #6 copper have an allowable ampacity of 65A which means I should be able to use a 70A feeder (assuming that the load is much less than 65A).
Is this all correct?
Click to expand...

Since this is less than 100A, 110.14(C)(1)(a) drives you to the 60 deg column unless you can confirm on both ends of the conductors that it is 75 deg terminations.

Ampacity at 60 deg is 55A, so next standard breaker is 60A
 
ron said:
Since this is less than 100A, 110.14(C)(1)(a) drives you to the 60 deg column unless you can confirm on both ends of the conductors that it is 75 deg terminations.

Ampacity at 60 deg is 55A, so next standard breaker is 60A
Click to expand...
75 degrees on both. A 70A CH CH breaker to a 70A Siemens breaker.
 
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