metal race way ques?

[wireman1]

is it a requirment to use a metal race way such as mc ac emt for emergency lites smoke dectors in stairs ways for a 3 floor unit aptarment or is mn cable ok cite code article thanks .

 

[infinity]

It depends on the classification of building type:

334.10 Uses Permitted. Type NM, Type NMC, and Type
NMS cables shall be permitted to be used in the following:
(1) One- and two-family dwellings and their attached or
detached garages, and their storage buildings.
(2) Multifamily dwellings permitted to be of Types III, IV,
and V construction except as prohibited in 334.12.
(3) Other structures permitted to be of Types III, IV, and V
construction except as prohibited in 334.12. Cables
shall be concealed within walls, floors, or ceilings that
provide a thermal barrier of material that has at least a
15-minute finish rating as identified in listings of fire-
rated assemblies.