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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.
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Do you have to run wiring in conduit if its in the ground?
Wire in conduit for underground feeders has to have an insulationrating for wet and damp locations. In the marketplace there is also wiring thathas an insulation rating for direct burial that does not need to be installed into conduit.
Is it legal to support a conduit from another conduit of the same size?
No, the conduit has to be supported individually from a supportive structure. The spacing of the strapping is related to the size of the conduit.
Can you run 110 and 220 volt circuits in the same conduit?
Yes, 120 and 240 volts can be run in the same conduit.
What are the main principles concerning conduit bodies?
Conduit bodies are used to provide pulling access in a run of conduit, to conserve space where a full size bend radius would be impractical, to allow more bends to be made in a section of conduit or to split a conduit path into multiple directions.
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.)
