16600; Emergency Generator Systems [Standards]

By Susan Nelson,2014-11-22 07:07
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16600; Emergency Generator Systems [Standards]




     Refer to Section 15300 for requirements regarding fire protection systems.


     This section contains the requirements for equipment, including installation, for other

    than normal electrical systems. The Designer is required to utilize the latest revision of

    Requirements for Permanently Installed Emergency Generator Systems (15KW and

    Higher), as published by the North Carolina Department of Insurance. Exceptions,

    additions, and modifications of the above referenced document are as noted within

    this section.



    1. The type of fuel shall be limited to diesel fuel.

    2. Generators located outdoors shall be mounted on a steel reinforced

    concrete pad, raised 6” above adjacent grade, a minimum of 12” thick, or

    as recommended by generator manufacturer. Pad shall extend a

    minimum of 24” beyond edge of generator frame on the three normally

    used service sides and extended 6” beyond the frame at the radiator end.

    Concrete pad shall be chamfered on all four edges. Pad shall be sloped

    to prevent the collection of water.

    3. Generators located indoors shall be mounted on spring deflection type

    vibration isolators, on pads designed equal to outdoor pads, except pads

    to be 4” above adjacent floor surfaces. Generator pad shall be isolated,

    separated by expansion joint, from building slab.

    4. A drip pan shall be installed under indoor units to collect leaks and spills.

    Provide drain line, with valve, to floor drain.

    5. Provide day tanks for interior mounted generator sets.

    6. Outdoor generators shall be installed in aluminum skinned sound

    attenuated enclosures. Enclosure to have convenience GFCI type

    receptacle and fluorescent lighting to provide 75 fc around generator for

    service. Doors shall be located in the enclosure so that service points are

    directly accessible.

    7. Generators that are mounted where the service door opening is greater

    than 30” above surrounding finished grade shall have platforms East Carolina University Date of Issue: 01/15/07 Section 16600

    Construction Standards Supersedes: 02/15/04 Page: 1 of 4


    installed with handrails and steps that facilitate maintenance and

    servicing of the generator. Materials of construction shall be hot dipped

    galvanized steel, stainless steel or aluminum. Service platforms shall be

    a minimum of 48" wide or 12" wider than the width of any swinging service

    door in generator housing.

    8. All electrical connections to the unit shall have a section of flexible conduit

    for vibration isolation.

    9. Provisions must be made for sufficient make-up air for cooling of

    generators mounted inside buildings. Make-up air louvers shall be

    designed to prevent the entrance of rain when generators are operating. 10. Exterior units shall have a drain with a plugged ball valve accessible from

    the outside of any enclosure for draining oil. Exterior service points, such

    as valves, drains, etc. shall be secured w/ locks to prevent unauthorized

    access or tampering.

    11. Any manufacturers' requirements that are more stringent than these shall

    be adhered to.

    12. Acceptable Manufacturers: Caterpillar, Cummins/Onan, Detroit Diesel. 13. Exact location and size of fuel tank is to be verified on as-built drawings. 14. Locate tank so as to facilitate taking fuel level readings and performing

    other tasks which may require access to the inside of the storage tank

    through the filler neck.

    15. Diesel tanks shall be capable of holding sufficient fuel for running under

    full load for a minimum of 36 hours. Generators serving fire pumps shall

    have sufficient fuel capacity for 6 hours of fire pump run time plus that fuel

    needed for 36 hours of building loads.

    16. Day tank shall have an electric pump with pump test switch, automatic

    level control switches, overflow return to main tank, and fuel capacity for

    four hours running time.

    17. Galvanized pipes, fittings and tanks shall not be used on diesel fuel


    18. Diesel storage tanks located in the ground must comply with EPA, DEP,

    and any applicable local regulations. ECU does not prefer underground

    storage tanks. Designs for underground tanks must be pre-approved by

    the ECU Project Manager.

    19. Emergency generators serving buildings with fire pumps shall be equipped

    with a dedicated breaker meeting NFPA requirements for fire pump

    East Carolina University Date of Issue: 01/15/07 Section 16600

    Construction Standards Supersedes: 02/15/04 Page: 2 of 4


    electrical services.

    20. Generator must be capable of being independently started from multiple

    automatic transfer switches, such as fire pump controller. 21. Generators requiring permits according to NCDENR regulations shall

    have written confirmation from the Office of Environmental Health & Safety

    (EH&S) that the generator has been permitted. This letter shall be

    received prior to any construction of pad or generator being located on

    site. Generator shall not be operated, even for testing, until all of the

    permit requirements have been met. For planning purposes, request for

    permits should be requested 17 weeks in advance of the generator

    arriving on site. Designer must coordinate with ECU EH&S on information

    that must be submitted by Generator supplier for permit request.


    1. Generator exhaust, of indoor generators, should be vented above the roof.

    The exhaust system must keep fumes away from the immediate area of

    the generator, and from building fresh-air intakes.

    2. When outdoor generators are located near AHU outdoor air intakes,

    provisions shall be provided to ensure that exhaust gases are not allowed

    to enter into AHU intakes. Where generators are located adjacent to

    building exteriors that have individual window AC units or Fan Coil units,

    provisions shall be made to ensure that generator exhaust doesn’t re-enter

    building through these outdoor air sources. An acceptable method is to

    extend generator exhaust stack up side of building to above roof top level.

    In these cases, aesthetic considerations shall be given high priority. 3. Provide all generators with Critical Grade mufflers to keep sound levels

    down to a minimum. Indoor generator exhaust piping and mufflers shall

    be insulated and wrapped with stainless steel or aluminum skin wrap. 4. The exhaust system shall include a condensation trap with drain. 5. For indoor generators, provide a rain cap and thimble, and vibration

    isolation, for through-the-roof/wall penetrations.


    1. Automatic Transfer Switches (ATS's) shall have the following capabilities:

    Adjustable time delays on starting (1-30 sec.), retransfer (1-30 min.), and

    shutdown or cool-down (1-30 min.); control switch with "test-off-auto"

    positions; indicator lights for "normal power-available", "normal power-

    connected", "emergency power-available", "emergency power-connected";

    and manual transfer capability.

    East Carolina University Date of Issue: 01/15/07 Section 16600

    Construction Standards Supersedes: 02/15/04 Page: 3 of 4


    2. ATS’s shall be 4-pole type, with a bypass isolation switch for maintenance


    3. Indicating lights on ATS’s shall be the LED type.


    East Carolina University Date of Issue: 01/15/07 Section 16600

    Construction Standards Supersedes: 02/15/04 Page: 4 of 4

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