Hi, I am confused would somebody explain me the type of construction and use of romex, NMC permitted in those type of constr. Example: can a 1-story building , non-sprinklered used as a restaurant be wired through romrex?????? Thank you
Not sure if it could be in Ca. but here it could as long as one single room or separate area doesn't have seating for more then 100 people at a time, and that is even if a sprinkler system is required, here fire sprinklers are required anytime a commercial building exceeds 5k,sf, many of the chain hotels around here some 5 stories are all NM, just meeting rooms with capacities over 100 people or if they have a stage are required to be in pipe.
But Ca. may be different.
Also remember no NM over suspended ceilings in commercial
The NEC allows NM in type III, IV, and type V construction see 334.10,and also see Annex E Types of Construction in the back of the NEC.
It really has nothing to do with being residential or commercial, at least here it doesn't.
Here it can depend on if the state rates a building a I, or II type construction for most part if only a 15 minute barrier is required NM is good to go, but for a little better understanding take a look at Annex E Types of Construction in the back of the NEC, and then check to see if Ca. follows these guide lines.
Most schools will be of a type I or II rating, the hotels I mentioned had a type III, but if over 5 stories here it jumps to type II, most homes or multi-family are type V with a few large apartment buildings that can be type III if under 5 stories, or type II if over this, a log cabin type home is a type IV and it is considered heavy timber construction. but as Indiana has changed some requirements Ca. may have also.