SER proper sizing?

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ocoee

Member
Location
Golden Co
I would like to use SER as a "feeder" to a sub panel from my 150 amp service equipment. I would like to install a 150 amp sub panel.
Seems like I remember being told once I must use the 60 degree column of 310-16

The actual insulation on the conductors is XHHW-2 Can I use the 75 degree column?

Must I use 4/0 for this application?


Thank you---G
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
I would like to use SER as a "feeder" to a sub panel from my 150 amp service equipment. I would like to install a 150 amp sub panel.
Seems like I remember being told once I must use the 60 degree column of 310-16

The actual insulation on the conductors is XHHW-2 Can I use the 75 degree column?

Must I use 4/0 for this application?


Thank you---G

You must use the 60C rating. 334.80 It has changed a bit for 2011
 

hotwire1955

Senior Member
Location
nj
338.10(4) sends you to334.80 If your sub panel is the only panel from your main service then you can use the 75C colum 310.15(6)
 

iwire

Moderator
Staff member
Location
Massachusetts
Also those people on the 2011 NEC also will see it differently as well.;):grin:

The 2011 NEC change 338.10(B)(4)(a) to include "Excluding 334.80" again to match the 2005 NEC.

Chris


Anyone want to guess what it will be in 2014?

I bet we change again.
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
I don't understand for the life of me why 310.15(A)(2) exception doesn't apply in 2011 changes. They wont allow it here.
 
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