It's a good idea to place 220v AC single phase wire and 36v DC wire inside same conduit ?

 

Code might say something like, within a conduit, the voltage rating is equal to the lowest rated insulation. Meaning your 220v as now only rated to the 36v. Is that Ok? Where are you located?

 

Is it a good idea? Without knowing anything about your project, I would say no. If for no other reason than should someone come along behind you and need to debug something, you want it to be clear what voltage they're going to be encountering. If they go in expecting to be touching 36V DC and instead grab on to a 220V AC wire, someone might get hurt.

 

The lower voltage conductor is required to have the same insulation rating.

NFPA79: Wire insulation shall be identified and adequate for the voltage on that conductor.
Where the conductors are ran with or adjacent to other conductors, all conductors shall have the insulation rating for the maximum voltage involved.

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Also preferably that each pair(s) of conductors of a shared conduit be twisted along their length.

 

The lower voltage conductor is required to have the same insulation rating.

NFPA79: Wire insulation shall be identified and adequate for the voltage on that conductor.
Where the conductors are ran with or adjacent to other conductors, all conductors shall have the insulation rating for the maximum voltage involved.

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Yes... 36v DC is rated at 700v AC, same with 220v AC wire, it is safe ?, this isn't described in my local code

 

Also preferably that each pair(s) of conductors of a shared conduit be twisted along their length.

Am I get benefit from twisting that cable ?

 

To prevent the influence of EMI low voltage and conductors carrying AC should preferebly be twisted variety
Ground conductors can be untwisted, if need be.