NEC 240.21B - 25 Ft Feeder Tap Rule

[power2engineer]

Do I need to put Breakers for 2 Separate Panel board feeders supplied from load side of Automatic transfer switch with Utility and Stand by generator sources the 2 Panel boards are within 25 Ft from Service entrance ATS (with Stand by generator source) and has their own main breakers as well. Please See attached Sketch

 

[itsmoked]

This is the provided link.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[FacEngrPE]

The breakers upstream of the ABT switch protect the 1200A cables. The 600A tap appears to meet the rules requirements.

PROPOSED NFPA 70® 2014 Edition National Electrical Code® 240.21B(2)]

I copies this excerpt from the "final" Draft on NFPA's website.