Outside feeder minimum rating and size [225.5]

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tortuga

Code Historian
Location
Oregon
Occupation
Electrical Design
Greetings all;
Does 225 modify and supersede 215 for a outside feeder minimum rating and size?
Or does 225 just add requirements to 215?

In this scenario assume we have a farm pole; service, feeder and load-center that are all located outdoors.

I was just updating some code references on a load calculation and that lead me to looking up the one for continuous loads on a outside feeder.
Do you use the larger of 215.2(A) or 225.5?
All three sections in 225 dealing with load calculations 225.5, 225.8(B) 225.39 go straight to 220 omitting continuous load factors.
215.2(A) includes the 125% continuous factor.

215.2(A) seems like it would always have a larger number than 225.5, 225.8(B) And 225.39.

I understand Articles in the code modify each other and T225.3 pulls in article 215 for things not covered in 225. If it was intend to use 215.2(A) whats the point of 225.5, 225.8(B) And 225.39? Why not just point to 215.2(A)?
 

tortuga

Code Historian
Location
Oregon
Occupation
Electrical Design
Bump, just ran into this issue again, an outside feeder with a continuous load.
Under the 2017 NEC one could use 225.8 to calculate the load without adding 125% for the continuous load:
2017 NEC 225.8 (B):
Code:
Feeders. The load on outdoor feeders shall be as determined
by Part III of Article 220.

But now in 2020 the CMP deleted 225.8 so were back to 215:
215.2(A) includes the 125% continuous factor.
Case closed
 

Sunny_92

Member
Location
York, PA
I believe you are mistakenly interchanging load calculations with feeder sizing. 225 and 220 tell you how to determine what the load is. 215 tells you how to size the wire, knowing the load that you get from 220.
 
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