sharing grounded conductors

[ffalcon34]

im working in a town house with a 120/240 single phase system
the 3 story town home has a elevator problem is
the first shop drawing told me i need a 208/240v
20 amp circut for the elevator motor power
so we pulled a 12/2 w/g for this
we also pulled 1 115v dedacated circut for elev. lights and a GFI protected circut for elev.shaft
lighting and rec

now the problem
scince the elev has finally arrived i went look at the manuls and i found that the 208/240v 20 amp circut has to have a neutral

heres the question
from the 115v dedacated circut (not the gfi circut) could i share the neutral
any help

 

[tom baker]

Re: sharing grounded conductors

What is a 240/208 voltage? is this a mid point grounded delta?
Have you looked at NEC Article 620 elevators?

 

[don_resqcapt19]

Re: sharing grounded conductors

See 300.3(B).
Don