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Does commercial electrical wiring have to be in conduit if it is behind a wall covering?
It depends on whether the building classification is combustible or non combustible. On a new commercial building wiring is usually designed by an electrical engineer. In this case the wiring is done to their specifications. On a rewire of a commercial building BX cable can be used behind wall board. The reasoning is that most commercial buildings these days use steel studs. Dragging ordinary NMD wire through these types of studs can cut the outer sheath. In some jurisdictions steel stud bushings have to be used when a steel stud is hole punched. By using this type of wiring cable, rigid conduit or EMT does not have to be used.
How many watts can 16 gauge stranded wire carry?
To answer this question a voltage and amperage must be stated. W = Amps x Volts.
What is the minimum cable size required for 400Amps incoming supply?
A 600 MCM copper conductor with a insulation factor of 75 or 90 degrees C is rated for 420 and 455 amps respectively. To reduce the wire size from a single conductor, a parallel feed of 3/0 can be used.
Can ROMEX be used with wood construction for a three story hotel?
Depends on the state you live in and the local regulations.
What size ground wire for 100a service?
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
