If it is a legally required emergency system and falls under Article 700, look at the (1) through (4) in 700.9(B).
Generally speaking, you must keep these systems separate.
but to answer a question correctly one must know the exact application for the unit.
If it is a legally required emergency system and falls under Article 700,
I figured that was why jeremysterling had said 'IF".
My other comments were more of a side note. That way the proverbial "IF" doesn't have to come in to play.:roll:I agree