MI cable

[pgordon]

I am pricing a new 157 room , 6 story hotel.
(BUDGETARY pricing)
All I have is a brief SOW / narrative
It has a 250 kW generator on the roof with 3 output breakers and 3 ATSs

ATS-EM Emergency
ATS -LR Legally required stand by
ATS-OSB Optional stand by

ATS-EM will have 3 em panel boards serving designated emergency loads
RE: egress lighting, exist signage, fire alarm system , BDA ,

Because of the ” EM “ , the generator vendor told me I need to carry a roll up connection for back up when being serviced , (new 2017)

Question :
do I need to carry MI cable for ATS-EM / roll up conn ?
how about the "normal" side of the ATS ?
How about the branch circuits ?

 

[ramsy]

The Sr. Planner of a larger city, who teaches our local IAEI continuing education, approved MI cable feeders on a case-by-case basis for 2-hour fire ratings with commercial generators for years before it was included in California's IBC version (UBC) for that purpose. If your State has adopted a similar IBC version, MI cable may be there by now, or your regional Sr. Planner may approve it on a case-by-case basis.