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Does the metal conduit count as a ground?
No, each conduit must contain a separate grounding conductor.
When is it permissible to wire tie a wire to a conduit?
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.
Does triplex wire need to be in conduit under a house?
Yes. If they are single wires they need to be in a conduit.
Does the Nec allow grounding electrode conductor to be run in conduit that has other conductors in the conduit and what code section?
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.
How is wire pulled into a conduit of 100 feet?
A 100 foot fish tape and wire lubrication will be needed to make this wire pull.
