jtinge
Senior Member
- Location
- Hampton, VA
- Occupation
- Sr. Elec. Engr
I routinely interact with collegues that use the terms Service, Service Point, Service Disconnect, etc. as generic terms for the electical supply to a building even when there is no connection to a utility. Because of this, they incorrectly apply Article 230 Services requirements when Article 220 and 225 requirements for Buildings Supplied by a Feeder should be used. While there are a great deal of similarities between the requirements for Services and Buildings Supplied by a Feeder, there are some differences.
Similar to Figure 230.1-Services that illustrates the application of Article 230, I've drafted up a similar Figure 225.1 to help illustrate the correct application of Article 225, Part II. Also to show that similar devices may have different names and different code requirements depending upon whether it is a service or non-utlity electrical source to the building. Similar to the distinction of Main Bonding Jumper and System Bonding Jumper.
For the purpose of the Figure 225.1, I have drafted a new definition as follows:
Supply Point - A generic term to indicate the point of connection between the electrical supply and the premises wiring of a building or structure. The electrical supply can be a utility or an outside feeder from a non-utility electrical supply.
-When the electrical supply is a utility, the supply point is the ?service point?, and the wiring between the ?service point? and the connection to the premises wiring made at the service disconnecting means are service conductors.
-When the electrical supply is an outside non-utility electrical supply (outside feeder or outside separately derived system), the supply point is the load side connection of the non-utility electrical supply, and the wiring between the supply point and the connection to the premises wiring at the building disconnecting means are feeder conductors.
The term ?supply point? is offered as an analog to ?service point? when applying the requirements of Article 225, Part II Buildings or Other Structures Supplied by a Feeder(s) or Branch Circuit. It has no purpose other than as an aid to comparing the requirements of Article 230 Services with those of Article 225, when the electrical source to the building is not a utility.
I would be interested in whether you think such a figure (or something similar) is helpful for the stated purpose above?
Similar to Figure 230.1-Services that illustrates the application of Article 230, I've drafted up a similar Figure 225.1 to help illustrate the correct application of Article 225, Part II. Also to show that similar devices may have different names and different code requirements depending upon whether it is a service or non-utlity electrical source to the building. Similar to the distinction of Main Bonding Jumper and System Bonding Jumper.
For the purpose of the Figure 225.1, I have drafted a new definition as follows:
Supply Point - A generic term to indicate the point of connection between the electrical supply and the premises wiring of a building or structure. The electrical supply can be a utility or an outside feeder from a non-utility electrical supply.
-When the electrical supply is a utility, the supply point is the ?service point?, and the wiring between the ?service point? and the connection to the premises wiring made at the service disconnecting means are service conductors.
-When the electrical supply is an outside non-utility electrical supply (outside feeder or outside separately derived system), the supply point is the load side connection of the non-utility electrical supply, and the wiring between the supply point and the connection to the premises wiring at the building disconnecting means are feeder conductors.
The term ?supply point? is offered as an analog to ?service point? when applying the requirements of Article 225, Part II Buildings or Other Structures Supplied by a Feeder(s) or Branch Circuit. It has no purpose other than as an aid to comparing the requirements of Article 230 Services with those of Article 225, when the electrical source to the building is not a utility.
I would be interested in whether you think such a figure (or something similar) is helpful for the stated purpose above?