Author Topic: Can NMD/W be use in commerical  (Read 2786 times)

Offline B18aboost

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Can NMD/W be use in commerical
« on: July 16, 2010, 09:18:19 PM »
Can NMD/W wiring be used on a commercial application, such as connecting a ductless split condenser to indoor unit (208v) in a resturant, or does it have to be with BX?

Offline Admin

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Re: Can NMD/W be use in commerical
« Reply #1 on: July 17, 2010, 07:53:06 AM »
Yes, you can use NMD wiring as long as it's protected.

In home construction, wiring is commonly allowed to be installed directly in walls without additional protection. However, in commercial and industrial buildings, wiring needs to be protected from damage, so it is more commonly installed inside conduit or ductwork made of metal, plastic, or passageways cast in concrete.

While some types of wiring are available already inside a protective flexible spiraled metal shell, it is more common for conduit and ductwork to be installed empty and the wire added later by threading it through the finished passageways. The NEC spends considerable time documenting safe methods of installing cable in conduit, the primary concerns being the abrading of insulation, damage to the wire or insulation caused by sharp bends, kinking, and damage due to excess pulling strain.

I can't provide you with reference to code, but the ESA can if you ask,