DESIGN A/E NOTE - GUIDE SPECIFICATION CONVENTIONS
Color-highlighted text
Yellow: Editor’s Notes. Comments inserted into the text are addressed to the A/E, not the Contractor. Editor’s Notes are formatted as hidden text. Editor’s Notes are not identified with an update. Do not print Editor’s Notes in issue for distribution to Bidders/Contractors.
Tip: To not print Editor’s Notes (hidden text) in document choose Tools on Menu bar, click Options, Print tab, under Include with document, uncheck Hidden text (check to print text), click OK. Save.
Tip: To view Editor’s Notes (hidden text) in a document choose Tools on Menu bar, click Options, View tab, under Formatting marks, check Hidden text (uncheck to hide text), click OK. Save.
Note: Yellow highlighting may be used to identify hyperlinked text. No editing is required unless paragraph numbering is changed.
Red: Text updated in 1st quarter. April – June.
- Strikethrough text and highlighting (not text) in previously issued quarters are deleted. Only 1st quarter highlighted updated text is indicated.
Turquoise: Text updated in 2nd quarter. July – September.
- 1st quarter updated text remains highlighted.
Pink: Text updated in 3rd quarter. October – December.
- 1st and 2nd quarter updated text remain highlighted.
Bright Green: Text updated in 4th quarter. January – March.
- 1st, 2nd and 3rd quarter updated text remains highlighted.
Text Editing
Select options [in brackets] and edit <notes> before issuing specifications for distribution to Bidders/Contractors.
Delete Strikethrough text.
Tip: To delete strikethrough text, choose Edit on Menu bar, click Find, Find tab, More (Search Options opens), select All, click Format, Font, check Strikethrough, OK.
Click Replace tab, Replace All, OK, Close. Save.
Delete all highlighting of text from issue to be distributed to Bidders/Contractors.
Tip: To delete highlighting, locate cursor at beginning of Section and block all text in Section, press Shift + Control + End, click No Highlight icon on Formatting toolbar. Save.
IMPORTANT: Retain month and year in footer indicating updated Guide Specification Section issue used.
Note: This page will not print when Hidden text is unchecked as indicated in Editor’s Notes Tip.
NOTE IF THE GUIDE SPECIFICATION CONVENTIONS PAGE DOES NOT APPEAR CLICK ON SHOW/HIDE ICON ON MENU BAR OR CHOOSE TOOLS ON MENU BAR, CLICK OPTIONS, VIEW TAB, UNDER FORMATTING MARKS, CHECK HIDDEN TEXT (delete this note before printing)
Rev 19JUN09 j:\Projects\Active\com-deca_design_criteria_revisions-04071\Guide Specifications\TJG Innformation
SECTION 16415
TRANSFER SWITCHES
Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.
PART 1. GENERAL
1.1 RELATED DOCUMENTS
1.1.1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division1 Specification Sections, apply to this Section.
1.2 SUMMARY
1.2.1. This Section includes transfer switches rated 600 V and less, including the following:
Adjust list below to suit Project.
1.2.1.1. Automatic transfer switches.
1.2.1.2. Nonautomatic transfer switches.
1.2.2. Related Sections include the following:
List below only products that the reader might expect to find in this Section but are specified elsewhere.
1.3 SUBMITTALS
1.3.1. Product Data: Include rated capacities, operating characteristics, furnished specialties, and accessories.
1.3.2. Shop Drawings: Dimensioned plans, sections, and elevations showing minimum clearances, conductor entry provisions, gutter space, installed features and devices, and material lists for each switch specified.
Retain paragraph and subparagraphs below if required by seismic criteria applicable to Project. Coordinate with Division16 Section "Seismic Controls for Electrical Work."
1.3.3. Manufacturer Seismic Qualification Certification: Submit certification that transfer switches, accessories, and components will withstand seismic forces defined in Division16 Section "Seismic Controls for Electrical Work." Include the following:
1.3.3.1. Basis for Certification: Indicate whether withstand certification is based on actual test of assembled components or on calculation.
a. The term "withstand" means "the unit will remain in place without separation of any parts from the device when subjected to the seismic forces specified."
1.3.3.2. Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate and describe mounting and anchorage provisions.
1.3.3.3. Detailed description of equipment anchorage devices on which the certification is based and their installation requirements.
Coordinate paragraph below with qualification requirements in Division1 Section "Quality Requirements" and as supplemented in "Quality Assurance" Article.
1.3.4. Qualification Data: For manufacturer.
Retain first paragraph below if Contractor is responsible for field quality-control testing.
1.3.5. Field quality-control test reports.
1.3.6. Operation and Maintenance Data: For each type of product to include in emergency, operation, and maintenance manuals. In addition to items specified in Division1 Section "Phase Turnover and Contract Closeout" include the following:
1.3.6.1. Features and operating sequences, both automatic and manual.
1.3.6.2. List of all factory settings of relays; provide relay-setting and calibration instructions, including software, where applicable.
1.4 QUALITY ASSURANCE
1.4.1. Manufacturer Qualifications: Maintain a service center capable of providing training, parts, and emergency maintenance repairs within a response period of less than eight hours from time of notification.
1.4.2. Source Limitations: Obtain automatic transfer switches and nonautomatic transfer switches through one source from a single manufacturer.
See Editing Instruction No.3 in the Evaluations about labeling for emergency service in paragraph below.
1.4.3. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA70, Article100, for emergency service under UL1008, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.
Retain applicable standards in five paragraphs below.
1.4.4. Comply with NEMAICS1.
1.4.5. Comply with NFPA70.
1.4.6. Comply with NFPA110.
1.4.7. Comply with UL1008 unless requirements of these Specifications are stricter.
PART 2. PRODUCTS É
2.1 MANUFACTURERS
See Editing Instruction No.1 in the Evaluations for cautions about naming manufacturers and products.
2.1.1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:
2.1.1.1. Contactor Transfer Switches:
a. Caterpillar; Engine Div.
b. Emerson; ASCO Power Technologies, LP.
c. Generac Power Systems, Inc.
d. GE Zenith Controls.
e. Kohler Co.; Generator Division.
f. Onan Corp./Cummins Power Generation; Industrial Business Group.
g. Russelectric, Inc.
h. Spectrum Detroit Diesel.
i. Insert manufacturer's name.
2.2 GENERAL TRANSFER-SWITCH PRODUCT REQUIREMENTS
Coordinate paragraph below with Drawings and indicate percentage of tungsten filament lamp load for switches where it exceeds 30 percent. This percentage may affect switch selection. Some manufacturers' ratings for some switch lines apply to all classes of load, including tungsten lamps.
2.2.1. Indicated Current Ratings: Apply as defined in UL1008 for continuous loading and total system transfer, including tungsten filament lamp loads not exceeding 30 percent of switch ampere rating, unless otherwise indicated.
Coordinate paragraph below with Drawings. See Editing Instruction No.4 in the Evaluations.
2.2.2. Tested Fault-Current Closing and Withstand Ratings: Adequate for duty imposed by protective devices at installation locations in Project under the fault conditions indicated, based on testing according to UL1008.
Retain first paragraph below if required. Coordinate with Drawings.
2.2.3. Solid-State Controls: Repetitive accuracy of all settings is plus or minus 2 percent or better over an operating temperature range of minus 20 to plus 70 degC.
2.2.4. Resistance to Damage by Voltage Transients: Components shall meet or exceed voltage-surge withstand capability requirements when tested according to IEEEC62.41. Components shall meet or exceed voltage-impulse withstand test of NEMAICS1.
Coordinate paragraph below with Drawings.
2.2.5. Neutral Terminal: Solid and fully rated, unless otherwise indicated.
Retain paragraph below if required for heavy nonlinear loads. (Required if switch is applied at 120/208V application voltage rather than ahead of a 480V-120/208V transformer.) This requirement may result in some suppliers' oversizing certain switches to provide an oversize neutral. Coordinate with Drawings.
2.2.6. Oversize Neutral: Ampacity and switch rating of neutral path through units indicated for oversize neutral shall be double the nominal rating of circuit in which switch is installed.
Use NEMA250, Type12 enclosure if environment is generally dusty.
2.2.7. Enclosures: General-purpose NEMA250, Type1, 3R, or 12, as appropriate to the location, complying with NEMAICS6 and UL508, unless otherwise indicated.
Retain first paragraph below if one or more switches are exposed to outdoor temperatures and humidity. Coordinate with Drawings.
2.2.8. Heater: Equip switches exposed to outdoor temperatures and humidity, and other units indicated, with an internal heater. Provide thermostat within enclosure to control heater.
2.2.9. Factory Wiring: Train and bundle factory wiring and label, consistent with Shop Drawings, either by color code or by numbered or lettered wire and cable tape markers at terminations.
2.2.9.1. Designated Terminals: Pressure type suitable for types and sizes of field wiring indicated.
2.2.9.2. Power-Terminal Arrangement and Field-Wiring Space: Suitable for top, side, or bottom entrance of feeder conductors as indicated.
2.2.9.3. Control Wiring: Equipped with lugs suitable for connection to terminal strips.
2.2.10. Electrical Operation: Accomplish by a nonfused, momentarily energized solenoid or electric-motor-operated mechanism, mechanically and electrically interlocked in both directions.
2.2.11. Switch Characteristics: Designed for continuous-duty repetitive transfer of full-rated current between active power sources.
2.2.11.1. Limitation: Switches using molded-case switches or circuit breakers or insulated-case circuit-breaker components are not acceptable.
2.2.11.2. Switch Action: Double throw; mechanically held in both directions.
2.2.11.3. Contacts: Silver composition or silver alloy for load-current switching. Conventional automatic transfer-switch units, rated 225A and higher, shall have separate arcing contacts.
2.3 AUTOMATIC TRANSFER SWITCHES
2.3.1. Comply with Level1 equipment according to NFPA110.
2.3.2. Switching Arrangement: Double-throw type, incapable of pauses or intermediate position stops during normal functioning, unless otherwise indicated.
2.3.3. Manual Switch Operation: Under load, with door closed and with either or both sources energized. Transfer time is same as for electrical operation. Control circuit automatically disconnects from electrical operator during manual operation.
2.4 AUTOMATIC TRANSFER-SWITCH FEATURES
Edit this Article to coordinate terminology for sources, such as "normal," "preferred," "emergency," and "alternate," if such terms are used elsewhere in the Construction Documents. Revise pickup, dropout, and time-delay settings in first four paragraphs below to suit application, and retain required features.
First paragraph specifies three-phase undervoltage monitor. Retain if loss of one phase of normal source would be a problem for loads downstream from transfer switch. Similar option is available for emergency source.
2.4.1. Undervoltage Sensing for Each Phase of Normal Source: Senses low phase-to-ground voltage on each phase. Pickup voltage is adjustable from 85 to 100 percent of nominal, and dropout voltage is adjustable from 75 to 98 percent of pickup value. Factory set for pickup at 90 percent and dropout at 85 percent.
2.4.2. Time delay for override of normal-source voltage sensing delays transfer and engine start signals. Adjustable from zero to six seconds, and factory set for one second.
2.4.3. Voltage/Frequency Lockout Relay: Prevents premature transfer to generator. Pickup voltage is adjustable from 85 to 100 percent of nominal. Factory set for pickup at 90 percent. Pickup frequency is adjustable from 90 to 100 percent of nominal. Factory set for pickup at 95 percent.
2.4.4. Time Delay for Retransfer to Normal Source: Adjustable from 0 to 30 minutes, and factory set for 10 minutes. Provides automatic defeat of delay on loss of voltage or sustained undervoltage of emergency source, provided normal supply has been restored.
2.4.5. Test Switch: Simulates normal-source failure.
2.4.6. Switch-Position Pilot Lights: Indicate source to which load is connected.
2.4.7. Source-Available Indicating Lights: Supervise sources via transfer-switch normal- and emergency-source sensing circuits.
2.4.7.1. Normal Power Supervision: Green light with nameplate engraved "Normal Source Available."
2.4.7.2. Emergency Power Supervision: Red light with nameplate engraved "Emergency Source Available."
2.4.8. Unassigned Auxiliary Contacts: Two normally open, single-pole, double-throw contacts for each switch position, rated 10A at 240-V ac.
2.4.9. Transfer Override Switch: Overrides automatic retransfer control so automatic transfer switch will remain connected to emergency power source regardless of condition of normal source. Pilot light indicates override status.
Retain paragraph below if needed to coordinate with engine generator. Do not duplicate control features furnished with generator. See Editing Instruction No.7 in the Evaluations.
2.4.10. Engine Starting Contacts: One isolated and normally closed, and one isolated and normally open; rated 10A at 32-V dc minimum.
2.4.11. Engine Shutdown Contacts: Time delay adjustable from zero to five minutes, and factory set for five minutes. Contacts shall initiate shutdown at remote engine-generator controls after retransfer of load to normal source.
2.4.12. Engine-Generator Exerciser: Solid-state, programmable-time switch starts engine generator and transfers load to it from normal source for a preset time, then retransfers and shuts down engine after a preset cool-down period. Initiates exercise cycle at preset intervals adjustable from 7 to 30 days. Running periods are adjustable from 10 to 30 minutes. Factory settings are for 7-day exercise cycle, 20-minute running period, and 5-minute cool-down period. Exerciser features include the following:
2.4.12.1. Exerciser Transfer Selector Switch: Permits selection of exercise with and without load transfer.
2.4.12.2. Push-button programming control with digital display of settings.
2.4.12.3. Integral battery operation of time switch when normal control power is not available.
2.5 NONAUTOMATIC TRANSFER SWITCHES
2.5.1. Operation: Electrically actuated by push buttons designated "Normal Source" and "Alternate Source." In addition, removable manual handle provides quick-make, quick-break manual-switching action. Switch is capable of electrically or manually transferring load in either direction with either or both sources energized. Control circuit disconnects from electrical operator during manual operation.
2.5.2. Double-Throw Switching Arrangement: Incapable of pauses or intermediate position stops during switching sequence.
2.6 NONAUTOMATIC TRANSFER-SWITCH ACCESSORIES
2.6.1. Pilot Lights: Indicate source to which load is connected.
2.6.2. Source-Available Indicating Lights: Supervise sources via transfer-switch normal- and alternate-source sensing circuits.
2.6.2.1. Normal Power Supervision: Green light with nameplate engraved "Normal Source Available."