CHAPTER 27
ELECTRICAL
SECTION 2701
GENERAL
2701.1 Scope.
The provisions of this chapter and NFPA 70 shall govern the design, construction, erection and installation of the electrical components, appliances, equipment and systems used in buildings and structures covered by this code. The South Carolina Fire Code, the International Property Maintenance Code and NFPA 70 shall govern the use and maintenance of electrical components, appliances, equipment and systems. The International Existing Building Code and NFPA 70 shall govern the alteration, repair, relocation, replacement and addition of electrical components, appliances, or equipment and systems.
SECTION 2702
EMERGENCY AND STANDBY POWER SYSTEMS
[F] 2702.1 General.
Emergency power systems and standby power systems shall comply with Sections 2702.1.1 through 2702.1.8.
[F] 2702.1.2 Fuel-line piping protection.
Fuel lines supplying a generator set inside a high-rise building shall be separated from areas of the building other than the room the generator is located in by one of the following methods:
1.A fire-resistant pipe-protection system that has been tested in accordance with UL 1489. The system shall be installed as tested and in accordance with the manufacturer’s installation instructions, and shall have a rating of not less than 2 hours. Where the building is protected throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1, the required rating shall be reduced to 1 hour.
2.An assembly that has a fire-resistance rating of not less than 2 hours. Where the building is protected throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1, the required fire-resistance rating shall be reduced to 1 hour.
3.Other approved methods.
[F] 2702.1.4 Load transfer.
Emergency power systems shall automatically provide secondary power within 10 seconds after primary power is lost, unless specified otherwise in this code. Standby power systems shall automatically provide secondary power within 60 seconds after primary power is lost, unless specified otherwise in this code.
[F] 2702.1.5 Load duration.
Emergency power systems and standby power systems shall be designed to provide the required power for a minimum duration of 2 hours without being refueled or recharged, unless specified otherwise in this code.
[F] 2702.1.6 Uninterruptable power source.
An uninterrupted source of power shall be provided for equipment where required by the manufacturer’s instructions, the listing, this code or applicable referenced standards.
[F] 2702.1.7 Interchangeability.
Emergency power systems shall be an acceptable alternative for installations that require standby power systems.
[F] 2702.1.8 Group I-2 occupancies.
In Group I-2 occupancies located in flood hazard areas established in Section 1612.3, where new essential electrical systems are installed, and where new essential electrical system generators are installed, the systems and generators shall be located and installed in accordance with ASCE 24. Where connections for hookup of temporary generators are provided, the connections shall be located at or above the elevation required in ASCE 24.
[F] 2702.2 Where required.
Emergency and standby power systems shall be provided where required by Sections 2702.2.1 through 2702.2.19.
[F] 2702.2.3 Emergency responder communication coverage systems.
Standby power shall be provided for in-building 2-way emergency responder communication coverage systems required in Section 918 and the South Carolina Fire Code. The standby power supply shall be capable of operating the in-building 2-way emergency responder communication coverage system at 100-percent system operation capacity for a duration of not less than 12 hours.
[F] 2702.2.5 Exhaust systems.
Standby power shall be provided for common exhaust systems for domestic kitchens located in multistory structures as required in Section 505.5 of the South Carolina Mechanical Code. Standby power shall be provided for common exhaust systems for clothes dryers located in multistory structures as required in Section 504.11 of the South Carolina Mechanical Code and Section 614.11 of the South Carolina Fuel Gas Code.
[F] 2702.2.15 Membrane structures.
Standby power shall be provided for auxiliary inflation systems in permanent membrane structures as required in Section 3102.8.2. Standby power shall be provided for a duration of not less than 4 hours. Auxiliary inflation systems in temporary air-supported and air-inflated membrane structures shall be provided in accordance with Section 3103.10.4 of the South Carolina Fire Code.
[F] 2702.2.18 Special purpose horizontal sliding, accordion or folding doors.
Standby power shall be provided for special purpose horizontal sliding, accordion or folding doors as required in Section 1010.3.3. The standby power supply shall have a capacity to operate not fewer than 50 closing cycles of the door.
[F] 2702.3 Critical circuits.
Required critical circuits shall be protected using one of the following methods:
1. Cables, used for survivability of required critical circuits, that are listed in accordance with UL 2196 and have a fire-resistance rating of not less than 1 hour.
2. Electrical circuit protective systems having a fire-resistance rating of not less than 1 hour. Electrical circuit protective systems are installed in accordance with their listing requirements.
3. Construction having a fire-resistance rating of not less than 1 hour.