SECTION 16496

ENCLOSED TRANSFER SWITCH

PART	GENERAL

SECTION INCLUDES

Automatic transfer switch.

Automatic transfer switch and bypass/isolation switch.

Manual transfer switch.

RELATED SECTIONS

Section 03300 - Cast-in-Place Concrete: Housekeeping pads.

Section 16195 - Electrical Identification: Engraved nameplates.

Section 16622 - Package Engine-Generator System: Testing requirements.

REFERENCES

NFPA 70 - National Electrical Code.

NEMA ICS 1 - General Standards for Industrial Control and Systems.

NEMA ICS 2 - Standards for Industrial Control Devices, Controllers, and Assemblies.

NEMA ICS 6 - Enclosures for Industrial Controls and Systems.

SUBMITTALS

Submit under provisions of Section [01300.] [_______.]

Product Data: Provide catalog sheets showing voltage, switch size, ratings and size of switching and overcurrent protective devices, operating logic, short circuit ratings, dimensions, and enclosure details.

Manufacturer's Installation Instructions: Indicate application conditions and limitations of use stipulated by Product testing agency specified under Regulatory Requirements. Include instructions for storage, handling, protection, examination, preparation, installation, and starting of Product.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700.] [_______.]

Operation Data: Include instructions for operating equipment. Include instructions for operating equipment under emergency conditions [when engine generator is running.]

Maintenance Data: Include routine preventative maintenance and lubrication schedule. List special tools, maintenance materials, and replacement parts.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum [three] [_________] years [documented] experience[, and with service facilities within [100] [____] miles of Project].

Supplier: [Authorized] [Franchised] distributor of specified manufacturer with minimum [three] [____] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to requirements of NFPA 70.

Furnish products listed and classified by [UL] [testing firm acceptable to authority having jurisdiction] as suitable for purpose specified and indicated.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [________.]

Store in a clean, dry space. Maintain factory wrapping or provide an additional heavy canvas or heavy plastic cover to protect units from dirt, water, construction debris, and traffic.

Handle in accordance with manufacturer's written instructions. Lift only with lugs provided for the purpose. Handle carefully to avoid damage to internal components, enclosure and finish.

FIELD MEASUREMENTS

Verify that field measurements are as [indicated [on shop drawings].] [instructed by manufacturer.]

MAINTENANCE SERVICE

Furnish service and maintenance of transfer switch for [one year] [________] from Date of Substantial Completion.

MAINTENANCE MATERIALS

Provide maintenance materials under provisions of Section [01700.] [_______.]

Provide [two] [________] of each special tool required for maintenance.

PART	PRODUCTS

MANUFACTURERS

[_____________________________________] Model [_________].

[_____________________________________] Model [_________].

[_____________________________________] Model [_________].

Substitutions: Under provisions of Section [01600.] [________.]

AUTOMATIC TRANSFER SWITCH

Description: NEMA ICS 2, automatic transfer switch [suitable for use as service equipment].

Configuration: Electrically operated, mechanically held transfer switch.

AUTOMATIC TRANSFER AND BYPASS/ISOLATION SWITCH

Description: NEMA ICS 2, automatic transfer switch with manual bypass switch.

Configuration: Draw-out type electrically-operated, mechanically-held transfer switch with manually-operated CONNECTED, TEST, AND DISCONNECTED draw-out positions, and with mechanically-operated, mechanically-held transfer switch connected to bypass automatic switch in both NORMAL and EMERGENCY positions.

Bypass Switch Ratings: Match automatic transfer switch for electrical ratings.

MANUAL TRANSFER SWITCH

Description: NEMA ICS 2, manual transfer switch [suitable for use as service equipment].

Configuration: Electrically-operated, mechanically-held transfer switch.

Sequence of Operation: Switch position is selected by control switch mounted [in switch cover.] [remotely.]

SERVICE CONDITIONS

Service Conditions: NEMA ICS 1.

Temperature: [____] degrees F ([____] degrees C).

Altitude: [3,300] [6,600] [____] feet ([1 000] [2 000] [___] m).

RATINGS

Voltage: [________] volts, [single] [three] phase, [three] [four] wire, 60 Hz.

Switched Poles: [3.] [4.] [____.]

Load Inrush Rating: [Combination] [Tungsten lamp] [Electric discharge lamp] [Resistive] load.

Continuous Rating: [____] amperes.

Interrupting Capacity: [____] percent of continuous rating.

Withstand Current Rating: [________] rms symmetrical amperes, when used with [Class [J] [K1] [L] current limiting fuse] [molded case circuit breaker].

PRODUCT OPTIONS AND FEATURES

Indicating Lights: Mount in cover of enclosure to indicate NORMAL SOURCE AVAILABLE, ALTERNATE SOURCE AVAILABLE, SWITCH POSITION, [NORMAL BYPASS,] [ALTERNATE SOURCE BYPASS].

Test Switch: Mount in cover of enclosure to simulate failure of normal source.

Return to Normal Switch: Mount in cover of enclosure to initiate manual transfer from alternate to normal source.

Transfer Switch Auxiliary Contacts: [1] [____] normally open; [1] [____] normally closed.

Normal Source Monitor: Monitor [each line of] normal source voltage and frequency; initiate transfer when voltage drops below [85] [____] percent or frequency varies more than [3] [____] [percent] [Hertz] from rated nominal value.

Alternate Source Monitor: Monitor alternate source voltage and frequency; inhibit transfer when voltage is below [85] [____] percent or frequency varies more than [3] [____] [percent] [Hertz] from rated nominal value.

In-Phase Monitor: Inhibit transfer until source and load are within [____] electrical degrees.

Switched Neutral: [Overlapping] [Non-Overlapping] contacts.

AUTOMATIC SEQUENCE OF OPERATION

Initiate Time Delay to Start Alternate Source Engine Generator: Upon initiation by normal source monitor.

Time Delay To Start Alternate Source Engine Generator: 0 to [____] seconds, adjustable.

Initiate Transfer Load to Alternate Source: Upon initiation by normal source monitor and permission by alternate source monitor.

Time Delay Before Transfer to Alternate Power Source: 0 to [____] seconds, adjustable.

Inititate Retransfer Load to Normal Source: Upon permission by normal source monitor.

Time Delay Before Transfer to Normal Power: 0 to [____] seconds, adjustable; bypass time delay in event of alternate source failure.

Time Delay Before Engine Shut Down: 0 to [____] minutes, adjustable, of unloaded operation.

Engine Exerciser: Start engine every [7] [30] [____] days; run for [30] [____] minutes before shutting down. Bypass exerciser control if normal source fails during exercising period.

Alternate System Exerciser: Transfer load to alternate source during engine exercising period.

ENCLOSURE

Enclosure: ICS 6, Type [1.] [12.] [____.]

Finish: [Manufacturer's standard gray enamel.] [________.]

PART	EXECUTION

EXAMINATION

Verify conditions under the provisions of Section [01039.] [________.]

Verify that surface is suitable for transfer switch installation.

PREPARATION

Provide housekeeping pads under the provisions of Section [03300.] [________.]

INSTALLATION

Install transfer switches in accordance with manufacturer's instructions.

Provide engraved plastic nameplates under the provisions of Section 16195.

MANUFACTURER'S FIELD SERVICES

Prepare and start systems under provisions of Section [01400.] [________.]

DEMONSTRATION

Provide systems demonstration under provisions of Section [01650.] [________.]

Demonstrate operation of transfer switch in [bypass,] normal, and emergency modes.

END OF SECTION