What kind of wire?
If it's a power wire, why is the place wired with conduit?
Commercial buildings must put all power wiring in conduit, so if you're planning to run romex in a commercial building, the answer would be "no", it's not permissible.
If it's data wire, note that there may be some "crossover" interference if the data wire follows a power wire for very much distance. It's usually not a problem to cross a conduit and tie to it, but it's generally recommended that you not tie data cable to conduit.
Yes. If they are single wires they need to be in a conduit.
No, the bare copper grounding conductor can not be in a conduit with other conductors. It can be in conduit by itself to provide mechanical protection for the wire.
A 100 foot fish tape and wire lubrication will be needed to make this wire pull.
You can pull 10 #3 gauge wires in a 2 1/2" conduit.
No, the electrical code requires that the mineral insulated cable be strapped at proper intervals and not be piggy backed on to other conduit structures.
No, the cat 5 wire should cross conduits at an angle of 90 degrees. If the cat 5 wire is installed in conduit then it can be run parallel with the other conduits. Yes they can be installed above the dropped ceilings but tie them up high near the joists.
A conduit bushing is used when a conduit is terminated in a junction box or enclosure. Its purpose is to provide a smooth rounded surface so that when the wire is pulled into the conduit the insulation on the wire will not be damaged.
Yes. If they are single wires they need to be in a conduit.
Conduit wiring is simply wiring that you find in a conduit. Typically, a conduit is a small round tube, usually metal but sometimes plastic, that carries wires from one area to the next. Wire has a tenancy to sag and get tangled and such when it is laid out in long distances. The conduit serves to protect the wire and to ensure it stays linear and it stays in place.
Not normally. An elaboration of what circuits are in the conduit and what type of conduit it is would be useful, though, and necessary to give a definitive answer.
== == Think about it. The conduit is metal, and can be touched by people. It is carrying live wires and is connected to steel junction boxes. What would happen if a hot wire accidentally touched the steel conduit? The ground wire is there to keep the conduit from going live in a fault condition. You want to ground any metal surface a user can touch in case of faults.
to prevent live conduit in case of short circuit
Generally, when using PVC conduit you should also run a ground wire.
In the first part of the question there will be only one wire in the conduit, in the second part of the question there will be two wires in the conduit.
8 or 10 Kgs tie wire is used
No. The new electrical code change does not allow any flexible conduit to be used as a ground means. It is now required to have a green ground wire pulled into the conduit with the other conductors in the flexible conduit. This grounded bonding conductor is not counted as wire fill when calculating the size of the flexible conduit to use
No, the bare copper grounding conductor can not be in a conduit with other conductors. It can be in conduit by itself to provide mechanical protection for the wire.