MC vs Romex

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bgelectric

Senior Member
Is there an easy way to determine whether a building can or cannot be wired in romex based on the NEC?
I know the 4 stories or more and 100 or more occupancy must be in MC. Besides this does someone have a "rule of thumb" to follow.
Im bidding a project which is a comfort station aka bathrooms and a shower on a beach. Spec says Nm is ok where allowed by NEC.
Building will be wood frame.
 

raider1

Senior Member
Staff member
Location
Logan, Utah
The 4 story limitation was removed in the 2002 NEC.

334.10(3) permits non-dwelling structures of type III, IV or V construction be wired with NM cable. (Wood framed buildings are most likely Type V)

334.12(A)(2) prohibits NM cable from being installed above dropped or suspended ceilings.

518.4(B) Permits NM cable to be installed in assembly occupancies in walls floors and ceilings that are not required to be of fire rated construction.

Chris
 

kwired

Electron manager
Location
NE Nebraska
General rules -

If a dwelling or on dwelling property - NM is usually allowed.

If not a dwelling NM may be allowed if enclosed in at least 15 minute fire rated finish (usually means drywall, masonry, other naturally fire resistant materials. If not in at least 15 minute rated finish - it is time to look even deeper before assuming it is OK to use NM.

If not in at least 15 minute fire rated construction it usually is not allowed to use NM in other than dwellings, and all NM in non dwellings is generally concealed wiring because of this rule.
 
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