fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
Section/Paragraph: 230.2
Revised Text
230.2 Number of Services.
A building or other structure served shall be supplied by only one supply-service unless permitted in 230.2(A) through (D). For the purpose of 230.40, Exception No. 2 only, underground sets of conductors, 1/0 AWG and larger, running to the same location and connected together at their supply end but not connected together at their load end shall be considered to be supplying one service.
(A) Special Conditions.
Additional supply-services shall be permitted to supply the following:
(1) Fire pumps
(2) Emergency systems
(3) Legally required standby systems
(4) Optional standby systems
(5) Parallel power production systems
(6) Systems designed for connection to multiple sources of supply for the purpose of enhanced reliability
(B) Special Occupancies.
By special permission, additional supply-services shall be permitted for either of the following:
(1) Multiple-occupancy buildings where there is no available space for supply-service equipment accessible to all occupants
(2) A single building or other structure sufficiently large to make two or more supply-services necessary
(C) Capacity Requirements.
Additional supply-services shall be permitted under any of the following:
(1) Where the capacity requirements are in excess of 2000 amperes at a supply voltage of 1000 volts or less
(2) Where the load requirements of a single-phase installation are greater than the serving agency normally supplies through one service
(3) By special permission
(D) Different Characteristics.
Additional supply-services shall be permitted for different voltages, frequencies, or phases, or for different uses, such as for different rate schedules.
(E) Identification.
Where a building or structure is supplied by more than one supply-service, or any combination of branch circuits, feeders, and services, a permanent plaque or directory shall be installed at each supply-service disconnect location denoting all other supply-services, feeders, and branch circuits supplying that building or structure and the area served by each. See 225.37.
Exception: A plaque or directory shall not be required at outside-supply disconnects for large-capacity multibuilding industrial installations under single management, where it is ensured that disconnection can be accomplished by establishing and maintaining safe switching procedures.
Substantiation
This proposal provides the same words for the same concepts in Articles 225 and 230, in conjunction with my "225.30 [lang]" proposal. It uses the defined terms proposed in my "100 Supply, Outside. and Supply-Service[new]" proposal.
The NEC_StyleManual 3.3.5 states: Parallel construction means stating similar requirements in similar ways for greater consistency. This helps makes the NEC clear for users. Lack of consistency often creates confusion, causing users to ask: Does this difference in wording represent a different requirement? Or is it simply two different ways of trying to say the same thing? ....
Inserted Deleted
Revised Text
230.2 Number of Services.
A building or other structure served shall be supplied by only one supply-service unless permitted in 230.2(A) through (D). For the purpose of 230.40, Exception No. 2 only, underground sets of conductors, 1/0 AWG and larger, running to the same location and connected together at their supply end but not connected together at their load end shall be considered to be supplying one service.
(A) Special Conditions.
Additional supply-services shall be permitted to supply the following:
(1) Fire pumps
(2) Emergency systems
(3) Legally required standby systems
(4) Optional standby systems
(5) Parallel power production systems
(6) Systems designed for connection to multiple sources of supply for the purpose of enhanced reliability
(B) Special Occupancies.
By special permission, additional supply-services shall be permitted for either of the following:
(1) Multiple-occupancy buildings where there is no available space for supply-service equipment accessible to all occupants
(2) A single building or other structure sufficiently large to make two or more supply-services necessary
(C) Capacity Requirements.
Additional supply-services shall be permitted under any of the following:
(1) Where the capacity requirements are in excess of 2000 amperes at a supply voltage of 1000 volts or less
(2) Where the load requirements of a single-phase installation are greater than the serving agency normally supplies through one service
(3) By special permission
(D) Different Characteristics.
Additional supply-services shall be permitted for different voltages, frequencies, or phases, or for different uses, such as for different rate schedules.
(E) Identification.
Where a building or structure is supplied by more than one supply-service, or any combination of branch circuits, feeders, and services, a permanent plaque or directory shall be installed at each supply-service disconnect location denoting all other supply-services, feeders, and branch circuits supplying that building or structure and the area served by each. See 225.37.
Exception: A plaque or directory shall not be required at outside-supply disconnects for large-capacity multibuilding industrial installations under single management, where it is ensured that disconnection can be accomplished by establishing and maintaining safe switching procedures.
Substantiation
This proposal provides the same words for the same concepts in Articles 225 and 230, in conjunction with my "225.30 [lang]" proposal. It uses the defined terms proposed in my "100 Supply, Outside. and Supply-Service[new]" proposal.
The NEC_StyleManual 3.3.5 states: Parallel construction means stating similar requirements in similar ways for greater consistency. This helps makes the NEC clear for users. Lack of consistency often creates confusion, causing users to ask: Does this difference in wording represent a different requirement? Or is it simply two different ways of trying to say the same thing? ....
Inserted Deleted
