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Yes. If they are single wires they need to be in a conduit.
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Conduit fitting is used on metal pipes that house electrical wires. These fittings are not only to connect the various pieces together, but to keep a relatively water tight seal to the wires.
You can pull 10 #3 gauge wires in a 2 1/2" conduit.
Cleat wiring is exposed while in conduit wiring the wires are well protected inside tubes/pipes.
Conduit wiring is synonymous to wires in a pipe.
According to appendix C of the NEC, 3 #2 awg are permitted in a 1" EMT.
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YES
Three number three wires can be installed in an inch and one quarter conduit.
16 current carry conductors
Yes. If they are single wires they need to be in a conduit.
To conceal and carry electrical or telecommunication wires
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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.
noyou can not
The size of conduit is based on the size of the wires in it. The size of the wires depends on the load connected in the house. Without these other two values an answer can not be given.