Generator Feed to ATS Conduit Sizing

[jar546]

If you have a generator that runs in 1-1/2" PVC Schedule 40 underground, then transitions to Schedule 80 PVC where it emerges from the ground and goes to the ATS, can you run four 1/0 copper THWN-2 conductors in that 1-1/2" PVC? This is an issue for sizing conduit and nothing else.

 

[e hilton]

In the sched 40 ... yes. In the sched 80 ... no.

 

[chris kennedy]

In the sched 40 ... yes. In the sched 80 ... no.

We have a winner!

 

[north star]

$ ~ $

Please provide the applicable Articles & Tables
from the NEC.........Myself, and others, [ may ] want
to know how the correct answer was arrived at.

Thanks !

$ ~ $

 

[jar546]

$ ~ $

Please provide the applicable Articles & Tables
from the NEC.........Myself, and others, [ may ] want
to know how the correct answer was arrived at.

Thanks !

$ ~ $

You can arrive at it 2 ways. First, you can simply go to the tables in Informative Annex C and use tables C1 through C13A based on the type conduit OR you can do it the old fashion way, something you will have to so if you have different size wires in the same conduit. You can do that by going to Chapter 9 and using Table 4 based on type conduit and percentage fill, then go to Chapter 9, Table 5 and get the approximate areas based on wire and insulation type.

 

[e hilton]

You can arrive at it 2 ways.

Three ways. Google “conduit fill table” and get a million hits, pick one that looks intelligent, there will be tables for different types of conduit, each with multiple columns and rows. Some of the better ones also have ways to figure different size conductors.

 

[jar546]

Three ways. Google “conduit fill table” and get a million hits, pick one that looks intelligent, there will be tables for different types of conduit, each with multiple columns and rows. Some of the better ones also have ways to figure different size conductors.

yes, you can't guarantee, however, that the fill table is accurate. There are apps that are legit. Knowing where to find it in the code and being able to read the small print notes below these tables is much more important in my opinion. Once you know how to do it then an app would be nice.