Mike Dolt Enterprises
Mike Dolt Enterprises
User: Mporter4, Location: 3 Hr 2 Min from Winged Horses
Asked on: Monday, March 14, 2011 at 3:20 pm EDT
Answered on: Tuesday, May 14, 2024 at 2:47 am EDT
Question: I am feeding a three phase panelboard and the poco transformer is a solid grounding three-phase 480-volt wye system,I have purchased a three-phase 480-volt 4-wire (w/neutral) panelboard.I will not be pulling a (neutral) wire and was wondering if this is acceptable?(note breakers are 480/277 volt rated)also I will be using the Neutral bar as a equipment grounding bar ( bonded to can).
Is using a three-phase 480-volt 4-wire panelboard without a neutral acceptable?Yes, it is acceptable.
In a solid grounding three-phase 480-volt wye system, the neutral point of the transformer is directly connected to the grounding system. This means that the neutral conductor is not required to carry current under normal operating conditions.
Can you use the neutral bar as an equipment grounding bar?Yes, you can.
In a wye system with a solidly grounded neutral, the neutral conductor and the equipment grounding conductor are often combined into a single conductor. This is known as a neutral-grounding conductor. In your case, you can bond the neutral bar to the panelboard enclosure and use it as a combined neutral-grounding conductor.
Additional Considerations
Make sure that the panelboard is rated for the voltage and current of the system. Use a main breaker that is rated for the total load of the panelboard. Install appropriate overcurrent protection devices for each circuit. Ensure that all equipment and wiring are properly grounded and bonded.
Note: It is always recommended to consult with a qualified electrician to ensure that the installation meets all applicable electrical codes and standards. Flag for review