Mike Dolt Enterprises
Mike Dolt Enterprises
User: anbm, Location: Brooklyn, NY
Asked on: Tuesday, March 29, 2011 at 5:30 pm EDT
Answered on: Tuesday, May 14, 2024 at 3:27 am EDT
Question: Motor A was fed from emergency power circuit (480V)Motor B was fed from normal power circuit (480V)From one control panel, we run (2) separate low voltage signal wiring to motor A and B starters, control panel is powered by 120V emergency power circuit. Will we mix two signal above wirings in same control box violate NEC-700 (separate normal and emergency circuits)???
Yes, mixing the two signal wires in the same control box will violate NEC-700.NEC-700 requires that normal and emergency circuits be kept separate, including their wiring and components. This is to ensure that in the event of an emergency, the emergency circuits can operate independently of the normal circuits.Mixing the signal wires from the emergency and normal circuits in the same control box could create a pathway for cross-contamination between the two circuits. This could result in the emergency circuits not functioning properly in the event of an emergency.To comply with NEC-700, the signal wires from the emergency and normal circuits should be kept separate throughout their entire length, including in the control box. Flag for review