Article 230
230.54 (D) Secured.
Service-entrance cables shall be held securely in place.
230.2 Number of Services. (D) Different Characteristics.
Additional services shall be permitted for different voltages, frequencies, or phases, or for different uses, such as for different rate schedules.
230.79 Rating of Service Disconnecting Means. (B) Two-Circuit Installations.
For installations consisting of not more than two 2-wire branch circuits, the service discon- necting means shall have a rating of not less than 30 amperes.
230.79 Rating of Service Disconnecting Means. (A) One-Circuit Installations.
For installations to supply only limited loads of a single branch circuit, the service disconnect- ing means shall have a rating of not less than 15 amperes.
230.30 Installation. (B) Wiring Methods.
Underground service conductors shall be installed in accordance with the applicable requirements of this Code covering the type of wiring method used and shall be limited to the following methods: 1) Type RMC conduit 2) Type IMC conduit 3) Type NUCC conduit 4) Type HDPE conduit 5) Type PVC conduit 6) Type RTRC conduit 7) Type IGS cable 8) Type USE conductors or cables 9) Type MV or Type MC cable identified for direct burial applications 10) Type MI cable, where suitably protected against physical damage and corrosive conditions
230.10 Vegetation as Support.
Vegetation such as trees shall not be used for support of overhead service conductors or serv- ice equipment.
(E) Identification.
Where a building or structure is supplied by more than one service, or any combination of branch circuits, feeders, and services, a permanent plaque or directory shall be installed at each service disconnect location denoting all other services, feeders, and branch circuits supplying that building or structure and the area served by each. See 225.37.
230.204 isolating switches (B) Fuses as Isolating Switch.
Where fuses are of the type that can be operated as a disconnecting switch, a set of such fuses shall be permitted as the isolating switch.
230.205 Disconnecting Means. (B) Type.
Each service disconnect shall simultaneously discon- nect all ungrounded service conductors that it controls and shall have a fault-closing rating that is not less than the availa- ble fault current at its supply terminals. Where fused switches or separately mounted fuses are installed, the fuse characteristics shall be permitted to contrib- ute to the fault-closing rating of the disconnecting means.
230.90 Where Required. (B) Not in Grounded Conductor.
No overcurrent device shall be inserted in a grounded service conductor except a circuit breaker that simultaneously opens all conductors of the circuit.
Part VIII. Services Exceeding 1000 Volts, Nominal 230.200 General.
Service conductors and equipment used on circuits exceeding 1000 volts, nominal, shall comply with all the applicable preceding sections of this article and with the follow- ing sections that supplement or modify the preceding sections. In no case shall the provisions of Part VIII apply to equipment on the supply side of the service point. Informational Note: For clearances of conductors of over 1000 volts, nominal, see ANSI/IEEE C2-2017, National Electrical Safety Code.
230.210 Service Equipment - General Provisions.
Service equipment, including instrument transformers, shall conform to Article 490, Part I.
230.202 Service-Entrance Conductors. (B) Wiring Methods.
Service-entrance conductors shall be installed by one of the wiring methods covered in 300.37 and 300.50,
230.85 Emergency Disconnects.
For one- and two-family dwell- ing units, all service conductors shall terminate in disconnect- ing means having a short-circuit current rating equal to or greater than the available fault current, installed in a readily accessible outdoor location. If more than one disconnect is provided, they shall be grouped. Each disconnect shall be one of the following: ( 1) Service disconnects marked as follows: EMERGENCY DISCONNECT, SERVICE DISCONNECT ( 2) Meter disconnects installed per 230.82(3) and marked as follows: EMERGENCY DISCONNECT, METER DISCONNECT, NOT SERVICE EQUIPMENT 3) Other listed disconnect switches or circuit breakers on the supply side of each service disconnect that are suita- ble for use as service equipment and marked as follows: EMERGENCY DISCONNECT, NOT SERVICE EQUIPMENT Markings shall comply with 110.21 (B).
230.95 Ground-Fault Protection of Equipment. (B) Fuses
If a switch and fuse combination is used, the fuses employed shall be capable of interrupting any current higher than the interrupting capacity of the switch during a time that the ground-fault protective system will not cause the switch to ореп.
230.204 Isolating Switches (D) Connection to Ground.
Isolating switches shall be provi- ded with a means for readily connecting the load side conduc- tors to a grounding electrode system, equipment ground busbar, or grounded steel structure when disconnected from the source of supply. A means for grounding the load side conductors to a grounding electrode system, equipment grounding busbar, or grounded structural steel shall not be required for any dupli- cate isolating switch installed and maintained by the electric supply company.
230.95 Ground-Fault Protection of Equipment. (C) Performance Testing
The ground-fault protection system shall be performance tested when first installed on site. This testing shall be conducted by a qualified person(s) using a test process of primary current injection, in accordance with instructions that shall be provided with the equipment. A writ- ten record of this testing shall be made and shall be available to the authority having jurisdiction.
230.204 Isolating Switches. (A) Where Required.
disconnecting means, an isolating switch with visible break contacts shall be installed on the supply side of the disconnect- ing means and all associated service equipment. Exception: An isolating switch shall not be required where the circuit breaker or switch is mounted on rermevable truck panels or switchgear units where both of the following conditions apply: (1) Cannot be opened unless the circuit is disconnected (2) Where all energized parts are automatically disconnected when the circuit breaker or switch is remored from the normal opwrating position
230.24 (E) Clearance from Communication Wires and Cables.
Clear- ance from communication wires and cables shall be in accord- ance with 800.44(A) (4).
Part VI. Service Equipment - Disconnecting Means 230.70 General.
Means shall be provided to disconnect all ungrounded conductors in a building or other structure from the service conductors.
230.24 (C) Clearance from Building Openings.
See 230.9.
230.24 (D) Clearance from Swimming Pools.
See 680.9.
Part I. General 230.2 Number of Services. (B) Special Occupancies
By special permission, additional services shall be permitted for either of the following: (1) Multiple-occupancy buildings where there is no available space for service equipment accessible to all occupants (2) A single building or other structure sufficiently large to make two or more services necessary
230.7 Other Conductors in Raceway or Cable.
Conductors other than service conductors shall not be installed in the same service raceway or service cable in which the service conductors are installed. Exception No. 1: Grounding electrode conductors or supply side bond- ing jumpers or conductors shall be permitted within service raceways. Exception No. 2: Load management control conductors having overcur- rent protection shall be permitted within service raceways.
230.3 One Building or Other Structure Not to Be Supplied Through Another.
Service conductors supplying a building or other structure shall not pass through the interior of another building or other structure.
230.70 General. (A) Location. (2) Bathrooms.
Service disconnecting means shall not be installed in bathrooms.
230.66 Marking. (A) General.
Service equipment rated at 1000 volts or less shall be marked to identify it as being suitable for use as service equipment. All service equipment shall be listed or field evalu- ated.
230.51 Mounting Supports. (B) Other Cables.
Cables that are not approved for mounting in contact with a building or other structure shall be mounted on insulating supports installed at intervals not exceeding 4.5 m (15 ft) and in a manner that maintains a clearance of not less than 50 mm (2 in.) from the surface over which they pass.
230.23 Size and Ampacity. (A) General.
Conductors shall have sufficient ampacity to carry the current for the load as calculated in accordance with Article 220 and shall have adequate mechanical strength.
230.71 Maximum Number of Disconnects.
Each service shall have only one disconnecting means unless the requirements of 230.71 (B) are met.
Part II. Overhead Service Conductors 230.22 Insulation or Covering.
Individual conductors shall be insulated or covered. Exception: The grounded conductor of a multiconductor cable shall be perrmitted to be bare.
230.56 Service Conductor with the Higher Voltage to Ground.
On a 4-wire, delta-connected service where the midpoint of one phase winding is grounded, the service conductor having the higher phase voltage to ground shall be durably and perma- nently marked by an outer finish that is orange in color, or by other effective means, at each termination or junction point.
230.9 (A) Clearances.
Service conductors installed as open conduc- tors or multiconductor cable without an overall outer jacket shall have a clearance of not less than 900 mm (3 ft) from windows that are designed to be opened, doors, porches, balco- nies, ladders, stairs, fire escapes, or similar locations. Exception: Conductors run above the top level of a window shall be permitted to be less than the 900 mm (3 fi) requirement.
230.50 (B)(1) Service-Entrance Cables.
Service-entrance cables, where subject to physical damage, shall be protected by any of the following: 1) Rigid metal conduit (RMC) 2) Intermediate metal conduit (IMC) 3) Schedule 80 PVC conduit 4) Electrical metallic tubing (EMT) 5) Reinforced thermosetting resin conduit (RTRC) 6) Other approved means
230.74 Simultaneous Opening of Poles.
Each service discon- nect shall simultaneously disconnect all ungrounded service conductors that it controls from the premises wiring system.
Part IV. Service-Entrance Conductors 230.40 Number of Service-Entrance Conductor Sets.
Each service drop, set of overhead service conductors, set of under- ground service conductors, or service lateral shall supply only one set of service-entrance conductors.
230.54 (G) Arranged That Water Will Not Enter Service Raceway or Equipment.
Service-entrance and overhead service conductors shall be arranged so that water will not enter service raceway or equipment.
230.51 Mounting Supports.
Service-entrance cables or individ- ual open service-entrance conductors shall be supported as specified in 230.51 (A). (B), or (C).
230.54 Overhead Service Locations. (B) Service-Entrance Cables Equipped with Service Head or Gooseneck.
Service-entrance cables shall be equipped with a service head. The service head shall be listed for use in wet locations. Exception: Type SE cable shall be permitted to be formed in a gooseeneck and taped with self-sealing weather-resistant thermoplastic.
230.31 Size and Ampacity. (B) Minimum Size.
The conductors shall not be smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum. Exception: Conductors supplying only limited loads of a single branch circuit - such as small polyphase poaver, controlled wvater heaters, and similar loads - shall not be smaller than 12 AWG copper or 10 A WG aluminum or copper-clad aluminum.
230.42 (C) Grounded Conductors.
The grounded conductor shall not be smaller than the minimum size as required by 250.24(C).
230.76 Manually or Power Operable.
The service disconnect- ing means for ungrounded service conductors shall consist of one of the following: 1) A manually operable switch or circuit breaker equipped with a handle or other suitable operating means 2) A power-operated switch or circuit breaker, provided the switch or circuit breaker can be opened by hand in the event of a power supply failure
230.31 Size and Ampacity. (A) General.
Underground service conductors shall have suffi- cient ampacity to carry the current for the load as calculated in. accordance with Article 220 and shall have adequate mechani- cal strength.
230.50 Protection Against Physical Damage. (A) Underground Service-Entrance Conductors.
Underground service-entrance conductors shall be protected against physical damage in accordance with 300.5.
230.24 Clearances. (A) Above Roofs.
Conductors shall have a vertical clearance of not less than 2.5 m (8 ft) above the roof surface. The vertical clearance above the roof level shall be maintained for a distance of not less than 900 mm (3 ft) in all directions from the edge of the roof.
230.66 Marking. (B) Meter Sockets.
Meter sockets shall not be considered serv- ice equipment but shall be listed and rated for the voltage and current rating of the service. Exception: Meter sockets supplied by and under the exclusive control of an electric utility shall not be required to be listed.
230.53 Raceways to Drain. (C) Service Heads and Goosenecks Above Service-Drop or Overhead Service Attachment.
Service heads on raceways or service-entrance cables and goosenecks in service-entrance cables shall be located above the point of attachment of the service-drop or overhead service conductors to the building or other structure. Exception: Where it is impracticable to locate the service head or goose- neck above the point of attachment, the service head or gooseneck loca- tion shall be permitted not farther than 600 mm (24 in.) from the point of attachment,
230.70 General. (A) Location. (1) Readily Accessible Location.
The service disconnecting means shall be installed at a readily accessible location eithen outside of a building or structure or inside nearest the point of entrance of the service conductors.
230.70 General. (A) Location.
The service disconnecting means shall be installed in accordance with 230.70(A) (1). (A) (2), and (A) (3).
230.79 Rating of Service Disconnecting Means.
The service disconnecting means shall have a rating not less than the calcu- lated load to be carried, determined in accordance with Part III, IV, or V of Article 220, as applicable. In no case shall the rating be lower than specified in 230.79(A), (B), (C), or (D).
230.77 Indicating.
The service disconnecting means shall plainly indicate whether it is in the open (off) or closed (on) position.
230.28 (A) Strength.
The service mast shall be of adequate strength or be supported by braces or guy wires to withstand safely the strain imposed by the service-drop or overhead service conduc- tors. Hubs intended for use with a conduit that serves as a serv- ice mast shall be identified for use with service-entrance equipment.
230.9 (B) Vertical Clearance.
The vertical clearance of final spans above, or within 900 mm (3 ft) measured horizontally of plat- forms, projections, or surfaces that will permit personal cotact shall be maintained in accordance with 230.24 (B).
Part III. Underground Service Conductors 230.30 Installation. (A) Insulation.
Underground service conductors shall be insu- lated for the applied voltage. Exception: A grounded conductor shall be permitted to be uninsulated as follows: 1) Bare copper used in a raceway 2) Bare copper for direct burial where bare copper is approved for the soil conditions 3) Bare copper for direct burial without regard to soil conditions where part of a cable assembly identified for underground use 4) Aluminum or copper-clad aluminum without individual insula- tion or covering zwhere part of a cable assembly identified for underground use in a raceuay or for direct burial.
230.32 Protection Against Damage.
Underground service conductors shall be protected against damage in accordance with 300.5. Service conductors entering a building or other structure shall be installed in accordance with 230.6 or protec- ted by a raceway wiring method identified in 230.43.
230.208 Protection Requirements.
A short-circuit protective device shall be provided on the load side of, or as an integral part of, the service disconnect, and shall protect all ungroun- ded conductors that it supplies. The protective device shall becapable of detecting and interrupting all values of current, in excess of its trip setting or melting point, that can occur at its location. A fuse rated in continuous amperes not to exceed three times the ampacity of the conductor, or a circuit breaker with a trip setting of not more than six times the ampacity of the conductors, shall be considered as providing the required short-circuit protection.
230.2 Number of Services.(C) Capacity Requirement
Additional 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 installa- tion are greater than the serving agency normally supplies through one service 3) By special permission
230.50 Protection Against Physical Damage. (B) All Other Service-Entrance Conductors.
All other service- entrance conductors, other than underground service entranceconductors, shall be protected against physical damage as specified in 230.50 (B) (1) (B) (2).
230.67 Surge Protection. (A) Surge-Protective Device.
All services supplying dwelling units shall be provided with a surge-protective device (SPD).
230.64 (C) Barriers.
Barriers shall be placed in service equipment such that no uninsulated, ungrounded service busbar or serv- ice terminal is exposed to inadvertent contact by persons or maintenance equipment while servicing load terminations.
Part VII. Service Equipment - Overcurrent Protection 230.90 Where Required.
Each ungrounded service conductor shall have overload protection.
Part V. Service Equipment - General 230.62 Service Equipment - Enclosed or Guarded.
Ener- gized parts of service equipment shall be enclosed as specified in 230.62 (A) or guarded as specified in 230.62 (B).
230.62 (A) Enclosed.
Energized parts shall be enclosed so that they will not be exposed to accidental contact or shall be guarded as in 230.62(B).
230.208 Protection Requirements.(A) Equipment Type
Equipment used to protect service- entrance conductors shall meet the requirements of Arti- cle 490, Part II.
230.79 Rating of Service Disconnecting Means. (C) One-Family Dwellings.
For a one-family dwelling, the serv- ice disconnecting means shall have a rating of not less than 100 amperes, 3-wire.
230.79 Rating of Service Disconnecting Means. (D) All Others.
For all other installations, the service discon- necting means shall have a rating of not less than 60 amperes.
230.205 Disconnecting Means. (C) Remote Control.
For multibuilding, industrial installations under single management, the service disconnecting means shall be permitted to be located at a separate building or structure. In such cases, the service disconnecting means shall be permitted to be electrically operated by a readily acces- sible, remote-control device.
230.95 Ground-Fault Protection of Equipment.
Ground-fault protection of equipment shall be provided for solidly grounded wye electric services of more than 150 volts to ground but not exceeding 1000 volts phase-to-phase for each service discon- nect rated 1000 amperes or more. The grounded conductor for the solidly grounded wye system shall be connected directly to ground through a grounding electrode system, as specified in 250.50, without inserting any resistor or impedance device. The rating of the service disconnect shall be considered to be the rating of the largest fuse that can be installed or the highest continuous current trip setting for which the actual overcurrent device installed in a circuit breaker is rated or can be adjusted.
230.9 (C) Building Openings.
Overhead service conductors shall not be installed beneath openings through which materials may be moved, such as openings in farm and commercial buildings,and shall not be installed where they obstruct entrance to these branch building openings.
230.24 Clearances.
Overhead service conductors shall not be readily accessible and shall comply with 230.24(A) through (E) for services not over 1000 volts, nominal.
230.202 Service-Entrance Conductors. (A) Conductor Size.
Service-entrance conductors shall not be smaller than 6 AWG unless in multiconductor cable. Multicon- ductor cable shall not be smaller than 8 AWG.
230.202 Service-Entrance Conductors.
Service-entrance conductors to buildings or enclosures shall be installed to conform to 230.202(A) and (B).
230.90 Where Required. (A) Ungrounded Conductor.
Such protection shall be provi- ded by an overcurrent device in series with each ungrounded service conductor that has a rating or setting not higher than the ampacity of the conductor. A set of fuses shall be consid- ered all the fuses required to protect all the ungrounded conductors of a circuit. Single-pole circuit breakers, grouped in accordance with 230.71 (B), shall be considered as one protec- tive device.
230.209 Surge Arresters.
Surge arresters installed in accord- ance with the requirements of Article 242 shall be permitted on each ungrounded overhead service conductor. Informational Note: Surge arresters may be referred to as light- ning arresters in older documents.
230.211 Switchgear.
Switchgear shall consist of a substantial metal structure and a sheet metal enclosure. Where installed over a combustible floor, suitable protection thereto shall be provided.
230.67 Surge Protection. (C) Type.
The SPD shall be a Type I or Type 2 SPD.
230.95 Ground-Fault Protection of Equipment. (A) Setting.
The ground-fault protection system shall operate to cause the service disconnect to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 1200 amperes, and the maxi-mum time delay shall be one second for ground-fault currents equal to or greater than 3000 amperes.
230.23 Size and Ampacity. (C) Grounded Conductors.
The grounded conductor shall not be less than the minimum size as required by 250.24(C).
230.31 Size and Ampacity. (C) Grounded Conductors.
The grounded conductor shall not be less than the minimum size required by 250.24(C).
230.204 (C) Accessible to Qualified Persons Only.
The isolating switch shall be accessible to qualified persons only.
230.72 Grouping of Disconnects. (B) Additional Service Disconnecting Means.
The one or more additional service disconnecting means for fire pumps, emergency systems, legally required standby, or optional standby services permitted by 230.2 shall be installed remote from the one to six service disconnecting means for normal service to minimize the possibility of simultaneous interruption of supply.
230.94 Relative Location of Overcurrent Device and Other Service Equipment.
The overcurrent device shall protect all circuits and devices.
230.26 Point of Attachment.
The point of attachment of the overhead service conductors to a building or other structure shall provide the minimum clearances as specified in 230.9 and 230.24. In no case shall this point of attachment be less than 3.0 m (10 ft) above finished grade.
230.208 Protection Requirements.(B) Enclosed Overcurrent Devices.
The restriction to 80 percent of the rating for an enclosed overcurrent device for continuous loads shall not apply to overcurrent devices installed in systems operating at over 1000 volts.
230.205 Disconnecting Means. (A) Location.
The service disconnecting means shall be loca- ted in accordance with 230.70. For either overhead or underground primary distribution systems on private property, the service disconnect shall be permitted to be located in a location that is not readily accessi- ble, if the disconnecting means can be operated by mechanical linkage from a readily accessible point, or electronically accordance with 230.205 (C), where applicable.
230.91 Location.
The service overcurrent device shall be an integral part of the service disconnecting means or shall be located immediately adjacent thereto. Where fuses are used as the service overcurrent device, the disconnecting means shall be located ahead of the supply side of the fuses.
230.1 Scope.
This article covers service conductors and equip- ment for control and protection of services and their installa- tion requirements.
230.2 (E) Identification.
Where a building or structure is supplied by more than one service, or any combination of branch circuits, feeders, and services, a permanent plaque or directory shall be installed at each service disconnect location denoting all other services, feeders, and branch circuits supplying that building or structure and the area served by each. See 225.37.
230.70 General. (A) Location. (3) Remote Control.
Where a remote control device (s) is used to actuate the service disconnecting means, the service discon- necting means shall be located in accordance with 230.70(A)(1).
230.53 Raceways to Drain.
Where exposed to the weather, raceways enclosing service-entrance conductors shall be listed or approved for use in wet locations and arranged to drain. Where embedded in masonry, raceways shall be arranged to drain.
230.52 Individual Conductors Entering Buildings or Other Structures.
Where individual open conductors enter a build- ing or other structure, they shall enter through roof bushings or through the wall in an upward slant through individual, noncombustible, nonabsorbent insulating tubes. Drip loops shall be formed on the conductors before they enter the tubes.
230.93 Protection of Specific Circuits.
Where necessary to prevent tampering, an automatic overcurrent device that protects service conductors supplying only a specific load, such as a water heater, shall be permitted to be locked or sealed where located so as to be accessible.
230.67 Surge Protection. (D) Replacement.
Where service equipment is replaced, all of the requirements of this section shall apply.
230.206 Overcurrent Devices as Disconnecting Means.
Where the circuit breaker or alternative for it, as specified in 230.208 for service overcurrent devices, meets the requirements speci- fied in 230.205, it shall constitute the service disconnecting means.
230.92 Locked Service Overcurrent Devices.
Where the serv- ice overcurrent devices are locked or sealed or are not readily accessible to the occupant, branch-circuit or feeder overcur- rent devices shall be installed on the load side, shall be moun- ted in a readily accessible location, and shall be of lower ampere rating than the service overcurrent device.
230.80 Combined Rating of Disconnects.
Where the service disconnecting means consists of more than one switch or circuit breaker, as permitted by 230.71, the combined ratings of all the switches or circuit breakers used shall not be less than the rating required by 230.79.
230.212 Over 35,000 Volts.
Where the voltage exceeds 35,000 volts between conductors that enter a building, they shall terminate in a switchgear compartment or a vault conforming to the requirements of 450.41 through 450.48.
Part I. General 230.2 Number of Services.
A building or other structure served shall be supplied by only one 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.
230.2 Number of Services. (A) Special Conditions.
Additional 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 supply for the purpose of enhanced reliability
230.6 Conductors Considered Outside the Building.
Conduc- tors shall be considered outside of a building or other structure under any of the following conditions: 1) Where installed under not less than 50 mm (2 in.) of concrete beneath a building or other structure 2) Where installed within a building or other structure in a raceway that is encased in concrete or brick not less than 50 mm (2 in.) thíck 3) Where installed in any vault that meets the construction requirements of Article 450, Part III 4) Where installed in conduit and under not less than 450 mm (18 in.) of earth beneath a building or other structure 5) Where installed within rigid metal conduit (Type RMC) or intermediate metal conduit (Type IMC) used to accommodate the clearance requirements in 230.24 and routed directly through an eave but not a wall of a building
230.42 Minimum Size and Ampacity. (A) General.
Conductors shall be sized not less than the largest of 230.42(A) (1) or (A) (2). Loads shall be determined in accordance with Part III, IV, or V of Article 220, as applicable. Ampacity shall be determined from 310.14 and shall comply with 110.14(C). The maximum current of busways shall be that value for which the busway has been listed labeled. 1)Where the service-entrance conductors supply continu- ous loads or any combination of noncontinuous and continuous loads, the minimum service-entrance conduc- tor size shall have an ampacity not less than the sum of the noncontinuous loads plus 125 percent of continuous loads, 2) The minimum service-entrance conductor size shall have an ampacity not less than the maximum load to be served after the application of any adjustment or correction factors. Service-entrance conductors shall have an ampacity of not less than the maximum load to be served.
230.71 Maximum Number of Disconnects. (A) General.
For the purpose of this section, disconnecting means installed as part of listed equipment and used solely for the following shall not be considered a service disconnecting means: 1) Power monitoring equipment 2) Surge-protective device(s) 3) Control circuit of the ground-fault protection system 4) Power-operable service disconnecting means
230.42 (B) Specific Installations.
In addition to the requirements of 230.42(A), the minimum ampacity for ungrounded conductors for specific installations shall not be less than the rating of the service disconnecting means specified in 230.79(A) through (D).
230.43 Wiring Methods for 1000 Volts, Nominal, or Less.
Service-entrance conductors shall be installed in accordance with the applicable requirements of this Code covering the type of wiring method used and shall be limited to the following methods: 1) Open wiring on insulators 2) Type IGS cable 3) Rigid metal conduit (RMC) 4) Intermediate metal conduit (IMC) 5) Electrical metallic tubing (EMT) 6) Electrical nonmetallic tubing 7) Service-entrance cables 8) Wireways 9) Busways 10) Auxiliary gutters 11) Rigid polyvinyl chloride conduit (PVC) 12) Cablebus (13) Type MC cable 14) Mineral-insulated, metal-sheathed cable, Type MI 15) Flexible metal conduit (FMC) not over 1.8 m (6 ft) long or liquidtight flexible metal conduit (LFMC) not over 1.8 m (6 ft) long between a raceway, or between a race- way and service equipment, with a supply-side bonding jumper routed with the flexible metal conduit (FMC) the liquidtight flexible metal conduit (LFMC) according to 250.102(A), (B), (C), and (E) (16) Liquidtioht flexible nonmetallic conduit LENC)
230.67 Surge Protection. (B) Location.
The SPD shall be an integral part of the service equipment or shall be located immediately adjacent thereto. Exception: The SPD shall not be required to be located in the service equipment as wquired in (B) if located at each next level distribution equipment dowmstream toward the load.
230.8 Raceway Seal.
Where a service raceway enters a building or structure from an underground distribution system, it shall be sealed in accordance with 300.5(G). Spare or unused race- ways shall also be sealed. Sealants shall be identified for use with the cable insulation, shield, or other components.
230.44 Cable Trays.
Cable tray systems shall be permitted to support service-entrance conductors. Cable trays used to support service-entrance conductors shall contain only service- entrance conductors and shall be limited to the following methods: 1) Type SE cable 2) Type MC cable 3) Type MI cable 4) Type IGS cable 5) Single conductors 1/0 and larger that are listed for use in cable tray 6) Type TCER cable Such cable trays shall be identified with permanently affixed labels with the wording "Service-Entrance Conductors." The labels shall be located so as to be visible after installation with a spacing not to exceed 3 m (10 ft) so that the service-entrance conductors are able to be readily traced through the entire length of the cable tray.
230.54 (F) Drip Loops.
Drip loops shall be formed on individual conductors. To prevent the entrance of moisture, service- entrance conductors shall be connected to the service-drop or overhead service conductors either (1) below the level of the service head or (2) below the level of the termination of the service-entrance cable sheath.
230.70 General. (B) Marking.
Each service disconnect shall be permanently marked to identify it as a service disconnect.
230.33 Spliced Conductors.
Service conductors shall be permitted to be spliced or tapped in accordance with 110.14, 300.5(E), 300.13, and 300.15.
230.54 (E) Separately Bushed Openings.
Service heads shall have conductors of different potential brought out through sepa- rately bushed openings. Exception: For jacketed multiconductor service entrance cable without splice.
230.6 Conductors Considered Outside the Building.
Conduc- tors shall be considered outside of a building or other structure under any of the following conditions: 1) Where installed under not less than 50 mm (2 in.) of concrete beneath a building or other structure 2) Where installed within a building or other structure in a raceway that is encased in concrete or brick not less than 50 mm (2 in.) thick 3) Where installed in any vault that meets the construction requirements of Article 450, Part III 4) Where installed in conduit and under not less than 450 mm (18 in.) of earth beneath a building or other structure 5) Where installed within rigid metal conduit (Type RMC) or intermediate metal conduit (Type IMC) used to accommodate the clearance requirements in 230.24 and routed directly through an eave but not a wall of a building
230.70 (C) Suitable for Use.
Each service disconnecting means shall be suitable for the prevailing conditions. Service equipment. installed in hazardous (classified) locations shall comply with the requirements of Articles 500 through 517.
230.64 (B) Guarded.
Energized parts that are not enclosed shall be installed on a switchboard, panelboard, or control board and guarded in accordance with 110.18 and 110.27. Where ener- gized parts are guarded as provided in 110.27(A) (1) and (A) (2), a means for locking or sealing doors providing access to energized parts shall be provided.
230.27 Means of Attachment.
Multiconductor cables used for overhead service conductors shall be attached to buildings or other structures by fittings identified for use with service conductors. Open conductors shall be attached to fittings iden- tified for use with service conductors or to noncombustible, nonabsorbent insulators securely attached to the building or other structure.
230.50 (B)(2) Other Than Service-Entrance Cables.
Individual open conductors and cables, other than service-entrance cables, shall not be installed within 3.0 m (10 ft) of grade level or where exposed to physical damage. Exception: Type Ml and Type MC cabe shall be permitted within 3.0 m (10 t) of grade level where not exposed to physical damnage or where protected in accordance with 300.5(D).
908 230.24 (B) Vertical Clearance for Overhead Service Conductors.
Overhead service conductors, where not in excess of 1000 volts, nominal, shall have the following minimum clearance from final grade: 1) 3.0 m (10 ft) - at the electrical service entrance to build- ings, also at the lowest point of the drip loop of the build- ing electrical entrance, and above areas or sidewalks accessible only to pedestrians, measured from final grade or other accessible surface only for overhead service conductors supported on and cabled together with a grounded bare messenger where the voltage does not exceed 150 volts to ground 2) 3.7 m (12 ft) - over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground 3) 4.5 m (15 ft) - for those areas listed in the 3.7 m (12 ft) classification where the voltage exceeds 300 volts to ground 4) 5.5 m (18 ft) - over public streets, alleys, roads, parking areas subject to truck traffic, driveways on other than resi- dential property, and other land such as cultivated, graz- ing, forest, and orchard 5) 7.5 m (24% ft) over tracks of railroads
230.54 Overhead Service Locations. (A) Service Head.
Service raceways shall be equipped with a service head at the point of connection to service-drop or over- head service conductors. The service head shall be listed for use in wet locations.
230.72 Grouping of Disconnects. (A) General.
The two to six disconnects, if permitted in 230.71, shall be grouped. Each disconnect shall be marked to indicate the load served. Exception: One of the two to six service disconnecting means permitted in 230.71, uhere used only for a water pump also intended to provide fire protection, shall be permitted to be located remote from the other disconnecting means. If wmotely installed in accordance with this exception, a plaque shall be posted at the location of the remaining grouped disconnects denoting its location.
230.71 Maximum Number of Disconnects. (B) Two to Six Service Disconnecting Means.
Two to six serv- ice disconnects shall be permitted for each service permitted by 230.2 or for each set of service-entrance conductors permitted by 230.40, Exception No. 1, 3, 4, or 5. The two to six service disconnecting means shall be permitted to consist of a combi- nation of any of the following: 1) Separate enclosures with a main service disconnecting means in each enclosure 2) Panelboards with a main service disconnecting means in each panelboard enclosure 3) Switchboard (s) where there is only one service discon- nect in each separate vertical section where there are barriers separating each vertical section 4) Service disconnects in switchgear or metering centers where each disconnect is located in a separate compart- ment
230.41 Insulation of Service-Entrance Conductors.
Service- entrance conductors entering or on the exterior of buildings or other structures shall be insulated. Exception: A grounded conductor shall be permitted to be uninsulated as follous: 1) Bare copper used in a raceway or part of a service cable assembly 2) Bare copper for direct burial whee bare copper is approved for the soil conditions 3) Bare copper for direct burial without ngand to soil conditions where part of a cable assembly identified for underground use 4) Aluminum or copper-clad aluminum without individual insula- tion or covering where part of a cable assembly or identified for underground use in a raceway, or for direct burial 5) Bare conductors used in an auxiliary gutter
230.75 Disconnection of Grounded Conductor.
Where the service disconnecting means does not disconnect the grounded conductor from the premises wiring, other means shall be provided for this purpose in the service equipment A terminal or bus to which all grounded conductors can be attached by means of pressure connectors shall be permitted for this purpose. In a multisection switchboard or switchgear, discon- nects for the grounded conductor shall be permitted to be in any section of the switchboard or switchgear. Informational Note: In switchgear or multisection switchboards, the disconnecting means provided for the grounded conductor is typically identified as a neutral disconnect link and is typically located in the bus to which the service grounded conductor is connected.
230.72 Grouping of Disconnects. (C) Access to Occupants.
In a multiple-occupancy building, each occupant shall have access to the occupant's service disconnecting means. Exception: In a multiple-occupancy building uhere electric service and electrical maintenance are provided by the building management and where these ae under continuous building management supervision, the service discon necting means supplying more than one occupIncy shall be permitted to be accessible to authorized management personnel only
230.28 Service Masts as Supports.
Only power service-drop or overhead service conductors shall be permitted to be attached to a service mast. Service masts used for the support of service- drop or overhead service conductors shall be installed in accordance with 230.28(A) and (B).
230.51 Mounting Supports. (C) Individual Open Conductors.
Individual open conductors shall be installed in accordance with Table 230.51 (C). Where exposed to the weather, the conductors shall be mounted on insulators or on insulating supports attached to racks, brackets, or other approved means. Where not exposed to the weather, the conductors shall be mounted on glass or porcelain knobs.
230.9 Clearances on Buildings.
Service conductors and final spans shall comply with 230.9(A). (B), and (C).
230.29 Supports over Buildings.
Service conductors passing over a roof shall be securely supported by substantial struc- tures. For a grounded system, where the substantial structure is metal, it shall be bonded by means of a bonding jumper and listed connector to the grounded overhead service conductor. Where practicable, such supports shall be independent of the building.
230.28 (B) Attachment.
Service-drop or overhead service conductors shall not be attached to a service mast between a weatherhead or the end of the conduit and a coupling, where the coupling is located aboe the last point of securement to the building or other structure or is located above the building or other struc- ture.
230.51 Mounting Supports. (A) Service-Entrance Cables.
Service-entrance cables shall be supported by straps or other approved means within 300 mm (12 in.) of every service head, gooseneck, or connection to a raceway or enclosure and at intervals not exceeding 750 mm (30 in.).
230.46 Spliced and Tapped Conductors.
Service-entrance conductors shall be permitted to be spliced or tapped in accordance with 110.14, 300.5(E). 300.13, and 300.15. Power distribution blocks, pressure connectors, and devices for splices and taps shall be listed. Power distribution blocks installed on service conductors shall be marked "suitable for use on the line side of the service equipment" or equivalent. Effective January 1, 2023, pressure connectors and devices for splices and taps installed on service conductors shall be marked "suitable for use on the line side of the service equip- ment" or equivalent.
230.23 Size and Ampacity. (B) Minimum Size.
The conductors shall not be smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum. Exception: Conductors supplying only limited loads of a single branch circuit - such as small polyphase power, controlled water heaters, and similar loads - shall not be smaller than 12 AWG hard-drawn copper or equivalent.
