Class 155 xmfr

[buck]

New 150kva dry-type xmfr installed in (non 1 hour rated) room. 450.21(B) ex. 2 says this installation is approved if xmfr is Class 155 or higher. Question is, name plate does not have a "Class" marking, how would we determine its Class?
Thanks in advance

 

[bob]

Re: Class 155 xmfr

When in doubt do a google search.

http://www.essexgroup.com/News_Media/White_Papers/thermalclass.pdf

[ October 04, 2005, 11:35 PM: Message edited by: bob ]