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Does the metal conduit count as a ground?
No, each conduit must contain a separate grounding conductor.
Can a three phase circuit be installed in the same conduit or in different conduits?
The conductors of any three phase circuit must be run in the same conduit. If the circuit requires a neutral, it must also run with the conductors in the same conduit. (If they were to be run in more than one conduit or raceway, the circuit would not operate properly.)
Can multiple feeders be in same conduit?
Yes they can. If the feeders are of different sizes, then a conduit fill calculation must be made to ascertain that the conduit does not become overfilled. Cross sectional areas of the conductors are found and it is then determined what the conduit cross sectional fill will allow.
How you check the stability of the cable feeder?
To make sure that a feeder cable is secure it must be supported. The support distance is stated in the electrical code book. The code also gives support of cable trays, conduit and all the different ways to support cables.
Can you run insulated wires in a conduit pipe?
Except for the ground wire they must be insulated.
