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.
There are both industrial and home owner cable pulling techniques. The former may involve heavy equipment and cable greasing and many people. Pulling cable on a small scale involves a snake and sometimes a pull cord. A snake is a coiled metal strip that you push through the conduit. When it comes out the other end or to a pull box you connect the wire and pull it back through the conduit. If more wire might be pulled later, also attach a pull cord so it will be left behind in the conduit for future use.
Yes, any flexible conduit that has live wires drawn into it must have a ground wire also installed with the "hot" conductors. The reasoning behind this rule is that the flex in the conduit is coiled and has a long length to it. The continuation of the grounding medium through the tightness of the conduit connectors to the flex was not considered a properly secured grounding system so to overcome this weakness in the grounding system, a ground wire now has to be installed.
when it takes the static discharge wich gets let behind and nutralizes it
It can, the cheaper electrical tapes leave more residue than the better quality brands such as 3M. The longer you leave it on the more residue it leaves behind.
If the service stack is supported by a support structure and the utility feed drop is not supported from the conduit, the size of the conduit can be 1 1/4". If the service stack is used to support the utility feed drop then the conduit has to be 2" schedule 40 conduit. The reasoning behind this is that if in a storm a tree limb falls across the service drop, the lighter weight conduit could bend and pinch the wires in the stack and short out. This would be ahead of the main service breaker and the only protection for the wire would be the primary fuse at the transformer. Theoretically this amperage could rise to 50000 amps before the primary fuse blows. A schedule 40 service stack if supported, as the code requires, will withstand most tree falls. What is most likely to happen is that the utility connectors will pull apart leaving the service stack intact.
Conduit is not required for residential electrical IF THE WIRING IS BEHIND THE WALL. If it's exposed wiring, you'll need to use conduit.
Conduit Engine and Tool bar is really bad .. adds so much garbage behind so as to profit as a marketting strategy
Try the right hand side of the boot behind the behind the carpet covering the wing.
Inside the trunk on the left side, behind the covering.
The plastic shroud behind the radiator usually covering the fan blades
The new Unilever commercial titled Why Bring Children Into This World, is meant to bring hope to future generations. The voice behind the commercial is Shah Rhuk Khan.
Portishead - Roads
MARISA MILLER: BEHIND THE SCENES OF "SMART & SEXY" NEW BUICK ENCLAVE COMMERCIAL
On BMW E39, which ranges from 1997 to 2003, it is behind the trunk covering on the left side, right behind the CD changer.
Brenda Holloway
you hit it with a bat. then tell you insurance you were hit from behind.
Covergirl Commercial Taylor Swift Behind the Scenes - 2010 TV was released on: USA: 22 April 2010