People are always surprised when I tell them that electricians around
here want to be both "the first ones in and the last ones in". The
electrical rough in guy is here just after being "under roof" he does
all rough in and drops only one or two outlets for everybody else
later. Then plumbing, heating/AC, insulation, drywall. Lastly the
final electrician wires the house, sometimes even after the painters
and cabinets. Flooring is last of course.
I can't immagine wiring a "stick-built" house with conduit. Concrete,
I can see.
Even steel-stud residential would be a complete pain. Generally
plastic bushings are installed in the through-holes of the tin stud to
keep the romex from shredding..
To use conduit EVERYTHING would have to come up or down throuh sills
and plates - virtually nothing could traverse walls. Would easily
DOUBLE the amount of wire required in the average home - particularly
in 2 story or split level designs.
In commercial with tin studs virtually everything is suspended ceiling
and the conduit can be run anywhere without having to peirce walls
Empty boxes are perfectly legal. That means no wires as well as no
receptacles. If there are wires in the box then it is a pull or
junction box and it must be accessible without removing structural
components or finish materials.
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