jtinge
Senior Member
- Location
- Hampton, VA
- Occupation
- Sr. Elec. Engr
The following is an example of how one campus-style location applies NEC feeder and service requirements to their system.
1. The service point at which the utility services end and the center?s primary distribution system begin, is defined as the connection between the utility?s overhead conductors and the main bus of the center?s primary substation.
2. The "source ends" (primary substation ends) of the center's primary distribution cables are feeders and shall comply with NEC Article 215, ?Feeders? and Article 225, ?Outside Branch Circuits and Feeders?.
3. The "load ends" (building ends) of the center?s primary distribution cables, however, shall be treated as the utility services to the building. Install service disconnecting means and comply with all of the requirements of NEC Article 230, ?Services?.
4. In a like manner, a secondary-voltage feeder (or feeders) from one building to another building shall be treated as the utility's service to the building. Install service disconnecting means and comply with all of the requirements of NEC Article 230, ?Services?.
Is this a reasonable approach, if not what changes should be made?
Since the equipment supplying building power at the load end of the primary feeder is by definition a separately derived system, is it appropriate to apply service requirements to this equipment?
How should grounding and bonding be addressed?
Does anyone know if there are any proposals to provide service entrance equipment requirements for equipment served by a feeder and separately derived system and not a utility connection?
1. The service point at which the utility services end and the center?s primary distribution system begin, is defined as the connection between the utility?s overhead conductors and the main bus of the center?s primary substation.
2. The "source ends" (primary substation ends) of the center's primary distribution cables are feeders and shall comply with NEC Article 215, ?Feeders? and Article 225, ?Outside Branch Circuits and Feeders?.
3. The "load ends" (building ends) of the center?s primary distribution cables, however, shall be treated as the utility services to the building. Install service disconnecting means and comply with all of the requirements of NEC Article 230, ?Services?.
4. In a like manner, a secondary-voltage feeder (or feeders) from one building to another building shall be treated as the utility's service to the building. Install service disconnecting means and comply with all of the requirements of NEC Article 230, ?Services?.
Is this a reasonable approach, if not what changes should be made?
Since the equipment supplying building power at the load end of the primary feeder is by definition a separately derived system, is it appropriate to apply service requirements to this equipment?
How should grounding and bonding be addressed?
Does anyone know if there are any proposals to provide service entrance equipment requirements for equipment served by a feeder and separately derived system and not a utility connection?