Passing 3 phase conductors - each in a seperate conduit

[bunuelbresson]

Do you think it is allowed to pass each conductor in a 3 phase feed in separate conduit?

There is no space to bend a 4 inch conduit to pass a 3 phase feed + ground (5 conductors). I was wondering if it is possible to pass each conductor in a separate 1 inch conduit? or this is not allowed?

 

[Carultch]

Do you think it is allowed to pass each conductor in a 3 phase feed in separate conduit?

There is no space to bend a 4 inch conduit to pass a 3 phase feed + ground (5 conductors). I was wondering if it is possible to pass each conductor in a separate 1 inch conduit? or this is not allowed?

You can parallel the feeds down to a 1/0 size as the minimum individual conductor, and then route the parallel sets in separate conduits. In any case, you have to keep complete sets in each conduit, so that the magnetic field is balanced.


There is section 300.5(I) Exception 2, which discusses Isolated Phase Installations. Generally, it is for underground installations in exclusively non-metallic conduit (even no metal locknuts), and you have to comply with all context rules.

 

[Smart $]

Though not a typical installation, see 300.3(B)(3), and therein referenced 300.20(B).