Transformer secondary protection

A

Akten

Member
Location
New York
Occupation
Engineer
Hi,

I am trying to interpret 240..21(C). Transformer secondary conductors can be installed without overcurrent protection at secondary, as specified in 240.21(C)(1) through(C)(6).

My question is, do we just have to meet any one of the 6 conditions in 240.21(C) or do we have to meet all 6, in order to have transformer secondary conductor without secondary overcurrent protection?
 
Any that apply can be incorporated.
Note that the "without overcurrent protection" is a bit misleading... there is normally overcurent protection it is simply at the end of the secondary conductors addressed by this section.
Also be sure to address Art 450 for transformer protection and 408.36 as far a panelboard protection.
 
You must log in or register to reply here.
Top