CONTENTS AUTOMATIC TRANSFER SWITCHES PART 1 GENERAL 1.1 Related Documents 1.2 Summary 1.3 References 1.4 Quality Assurance 1.5 Submittals 1.6 Delivery, Storage and Handling 1.7 Instructions And Training on Operation and Maintenance PART 2 PRODUCTS 2.1 Automatic Transfer Switch (ATS) 2.2 Enclosure 2.3 Testing PART 3 EXECUTION 3.1 Installation 3.2 Operational Testing
SECTION 16415 AUTOMATIC TRANSFER SWITCHES PART 1 GENERAL 1.1 RELATED DOCUMENTS Drawings and General Provisions of the Contract, including Contract Conditions and Specification Sections, apply to work of this Section. 1.2 SUMMARY This section covers the furnishing, the installing, and the placing in operation of the Automatic Transfer Switch. 1.3 REFERENCES 1.3.1 Governing Standards: Except as modified or supplemented herein, all equipment and materials required in this section including their installation shall conform to the applicable requirements of the following standards. Standards current at the time of tender shall be used. Institute of Electrical and Electronics Engineers IEEE No. C37.13 Low-Voltage AC Power Circuit Breakers Used in Enclosures C37.90.1 IEEE Standard Surge Withstanding Capability (SWC) Tests for Protective Relays and Relay Systems National Electrical Manufacturers Association NEMA No. ICS 1 ICS 2 ICS 4 ICS 6 Industrial Control and Systems Industrial Control Devices, Controllers and Assemblies Terminal Blocks for Industrial Use Enclosures for Industrial Control and Systems National Fire Protection Association NFPA No. 70 National Electrical Code 99 Standards for Health Care Facilities 110 Emergency and Standby Power Systems Underwriters Laboratories, Inc. UL No. 1008 Automatic Transfer Switches 1066 Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures
Local codes Egyptian codes 1.3.2 General Equipment Stipulations: Section 16050, General Equipment Stipulations shall apply to all equipment furnished under this section. 1.4 QUALITY ASSURANCE 1.4.1 Installer s Qualifications: The Contractor shall submit data showing that he has successfully installed systems of the same type and design as specified herein, or that the Contractor has a firm contractual agreement with a subcontractor having not less than ten years experience in the design and installation of such systems. Data shall include names and location of at least two installation he or his referenced subcontractors has installed such systems. The references shall indicate type and design of each system and certification that each system has performed satisfactorily in the manner intended for not less than three years. 1.4.2 Owner s Acceptance and Contractor s Responsibility: The Owner s acceptance of the Contractor s working drawings shall not relieve the Contractor from responsibility for errors, omissions, or deficiencies in the work. The Contractor shall verify actual conditions in the field and shall take all measurements necessary for proper installation of this work. 1.5 SUBMITTALS Submit the following in accordance with the requirements set forth at the Conditions of Contract. 1.5.1 Drawings and Data: One line diagram of ATS assembly and elementary or schematic and wiring diagram of the unit in plastic lamination permanently secured to the inside of the front enclosure door. An interface equipment connection diagram showing all conduits and wiring between the ATS all other related equipment. The one-line diagram shall show interlocking provisions and cautionary notes, if any. General arrangement and complete dimensional layout of the equipment. Above drawings shall show components description, technical ratings of equipment and materials. 1.5.2 Certificates: Test certificates shall be executed and submitted prior to final inspection and acceptance in accordance with the requirements of NEMA/IEC standards. The certified tests reports shall show date, time and duration of the overload, endurance and temperature tests, and that the unit under test was not de-energized during the test sequence. Three certified copies of each test certificate shall be submitted to the Owner s Representative. 1.5.3 Test Plan: Test plan and test procedures for the acceptance tests. The test plan and test procedures shall explain in detail, step-by-step actions and expected results to demonstrate compliance with the requirements specified. The procedure shall also explain methods for simulating the necessary conditions of operation to demonstrate system performance.
1.5.4 Acceptance Tests: Test reports in booklet form showing all field tests performed to adjust each component and to prove compliance with the specified performance criteria, upon completion and testing of the installed system. The reports shall include the manufacturer, model number, and serial number of test equipment used in each test. Each report shall indicate the final position of controls and operating mode of the system. 1.5.5 Operations and Maintenance Manuals/Charts and Spare Parts Data: Complete operations and maintenance manuals/charts including spare parts data and wiring diagrams of all equipment furnished under this section. 1.6 DELIVERY, STORAGE AND HANDLING 1.6.1 Storage: Supplementing the storage requirements described in Section 01605, General Equipment Stipulations the manufacturer shall acknowledge storage conditions at the time of submitting his Tender. The equipment may not be operational within 90 days after manufacture, and the manufacturer shall crate and prepare the equipment for export transportation and long-term storage. Precautionary measures for prolonged storage shall be provided by the manufacturer at the factory. The Contractor shall be responsible for storage and maintenance of the protective measures as recommended and instructed by the manufacturer while stored at the storage site. In additions to the protection specified for prolonged storage, the packaging of spare parts shall be prepared for export packing and shall be suitable for long-term storage in a damp location. Each spare item shall be packed separately and shall be completely identified on the outside of the container. Instructions for the servicing of equipment while in long-term or prolonged storage shall accompany each item of equipment. Advisement of enclosed instruction with each package shall be noted on the exterior of the package and shall be in the Arabic and English languages. 1.6.2 Verification of Dimensions: The Contractor shall become familiar with the details of the work and working conditions, shall verify dimensions in the field, and shall advise the Owner s Representative of any discrepancies before performing the work. 1.6.3 Warranty: The Maintenance Period for the equipment and appurtenances shall begin when the performance test on the equipment and appurtenances has been successfully completed and preliminary accepted as stipulated in the Conditions of Contract. 1.6.4 Spare Parts: All lists of all spare parts required for adjustment, operation, and maintenance of the equipment for a period of three years from the date of the certificate of completion shall be provided in accordance with the requirements of Section 01605, General Equipment Stipulations.
1.7 INSTRUCTIONS AND TRAINING ON OPERATION AND MAINTENANCE Contractor shall provide instructions and training for the staff to be assigned in the operation and maintenance of the equipment specified under this section. Training and instructions shall be in accordance with the requirements set forth at the Conditions of Contract. PART 2 PRODUCTS 2.1 AUTOMATIC TRANSFER SWITCH (ATS) 2.1.1 General: ATS shall be an integral part of Low Voltage Switchboard; ATS shall be the electrically operated type that is mechanically held in both operating positions. ATS shall be suitable for use in emergency or standby systems described in NFPA 70. ATS shall be UL listed or any other European Standard, and test reports are approved as being equivalent of test results and certified test reports as those determined and reported by UL or any other European Standard. ATS shall be the electrically-operated contactor or low-voltage power circuit-breaker type which shall be manufactured and tested in accordance with applicable requirements of IEEE C37.13, IEEE C37.90.1, NEMA ICS 1, NEMA ICS 2, UL 1008 and UL 1066. ATS shall also conform to NFPA 110 except that the ATS shall not be equipped with either overload or fault current protective devices and shall be designed and manufactured to prevent stops in an intermediate or neutral position during transfer by the use of electrical actuators and stored-energy mechanisms. Automatic Transfer Switch (ATS) shall have a continuous phase or main current rating equal to or exceed the rating shown but, in no case, less than 125 percent of the full load rating of the emergency power source, 380 volts, 4P, 50 Hz and 30 KA symmetrical minimum interrupting capacity, or as shown on the drawings 2.1.2 Override Time Delay: Time delay to override monitored source deviation shall be adjustable from 0.5 to 6 seconds and factory set at 1 second. The device shall detect and respond to a sustained voltage drop of 30 percent of nominal voltage between any two of the normal supply conductors and initiate transfer action to the emergency source and start the engine-driven generator set after the set time period. The pickup voltage shall be adjustable between 90 to 100 percent of nominal and factory set 90 percent. The dropout voltage shall be adjustable from 65 to 70 percent of the pickup value, and factory set at 70 percent of nominal voltage. 2.1.3 Transfer Time Delay: Time delay before transfer to the emergency power source shall be adjustable from 0.2 to 120 seconds and factory set at 10 seconds. The device shall monitor the frequency and voltage of the emergency power source and transfer when frequency and voltage is stabilized at or above 90 percent of rated values. The pickup voltage shall be adjustable from 85 to 100 percent of nominal, and factory set at 90 percent. The pickup frequency shall be adjustable from 90 to 100 percent of nominal and factory set at 90 percent.
2.1.4 Return Time Delay: Time delay before return transfer to the normal power source shall be adjustable from 2 to 30 minutes and factory set at 30 minutes. The time delay shall be automatically defeated upon loss or sustained under voltage of the emergency power source, provided that the normal supply has been restored. 2.1.5 Auxiliary Contacts: Two normally open and two normally closed auxiliary switches shall operate when the transfer switch is connected to the normal power source, and two normally open and two normally closed switches shall operate when the transfer switch is connected to the emergency power source. 2.1.6 Supplemental Features: The ATS shall also be furnished with the following: - Engine start contact - Alternate source monitor - Test switch - Close differential protection - Time delay by-pass switch - Manual return-to-normal switch 2.1.7 Motor Starter Control: Under voltage and timing relays, including any auxiliary relays required shall be installed in the ATS enclosure to provide an adequate number and type of properly rated contacts to control the operation of remote motor controllers or starters shown. Devices and wiring in and external to the ATS shall cause motors to be de-energized for an adjustable period of time before the operation of the ATS in either direction and, subsequently, to cause motors connected to the ATS load bus to be energized immediately after transfer at time intervals shown. The timing range shall be approximately from 1 to 15 seconds and factory set at 3 or 5 seconds. 2.1.8 Operator: A manual operator, conforming to the applicable provisions of UL 1008, shall be provided to permit manual operation of the ATS without opening the ATS enclosure, and incorporate features to prevent operation by other than authorized and qualified personnel. The ATS shall be designed for use of the manual operator under no load conditions in the usual instances, but with the capability of operation under load conditions when necessary. 2.1.9 Override Switch: The override switch shall by-pass automatic transfer controls so the transfer switch will transfer and remain connected to the emergency power source, regardless of the conditions of the normal power source. If the emergency source fails and the normal source is available, the transfer switch shall automatically retransfer to the normal source. 2.1.10 Green Indicating Lights: A green indicating light shall supervise the normal power source and shall have a nameplate engraved NORMAL.
2.1.11 Red Indicating Lights: A red indicating light shall supervise the emergency power source and shall have a nameplate engraved EMERGENCY. 2.2 ENCLOSURE 2.2.1 General: ATS and accessories shall be in a wall mounted, free-standing or floor-mounted and unventilated NEMA ICS 6, Type 1, smooth sheet metal enclosure constructed in accordance with UL 1008. Intake vent shall be screened and filtered. Exhaust vents shall be screened. Gauge of the metal shall be not less than 2 mm Doors shall have suitable hinges, locking handle latch, and gasket jambs. Enclosure shall be equipped with at least two approved size and type of grounding lugs for the purpose of grounding the enclosure using 25mm 2 copper conductors to the facility ground system. A thermostatically controlled heater shall also be provided within the enclosure to prevent condensation over the temperature range stipulated in paragraph SERVICE CONDITIONS. Factory wiring within the enclosure and the Contractor's field wiring terminating within the enclosure shall comply with NFPA 70. If wiring is not color coded, wires shall be permanently tagged near the terminal at each end with the wire number shown on approved detail drawings. Terminal blocks shall conform to NEMA ICS 4. Terminal facilities shall be suitably arranged for entrance of external conductors from the top or bottom of the enclosure or from the top and bottom, as shown. Main switch terminals, including the neutral terminal, shall be of the pressure type and suitable for the termination of the external copper or aluminum conductors shown. 2.2.2 Construction: Enclosure shall be constructed for convenient removal and replacement of contacts, coils, springs and control devices from the front without the disconnection of external power conductors or the removal or disassembly of major components. Enclosure housing of ATS shall be constructed to protect personnel from energized components. 2.2.3 Finishing: Painting required for surfaces not otherwise specified and finish painting of items only primed at the factory shall be as manufacturer s recommendations 2.3 TESTING 2.3.1 Laboratory Testing: Testing shall be completed on the ATS to be supplied under these specifications, or shall have been completed on a previous, randomly selected standard production ATS unit having the same model number and capacity as the ATS specified. Overload, endurance and temperature tests shall be conducted in that sequence and within the shortest practicable period of time on the same ATS without deenergization of that ATS under test. The test sequence for the ATS listed below shall be followed. No deviation will be granted that is less stringent. Approval will not be granted to deviate from the overload, endurance and temperature test sequence. - General - Normal Operation
- Over voltage - Under voltage - Overload - Endurance - Temperature rise - Dielectric Voltage Withstand - Contact Opening - Dielectric Voltage - Withstand (Repeated) - Withstand - Instrumentation and Calibration of High Capacity Circuits - Closings - Dielectric Voltage - Withstand (Repeated) - Strength of Insulating Base and Support 2.3.2 Factory Testing: In addition to other factory tests, each completely assembled ATS unit shall be subjected to dielectric and operational tests, and withstand tests. 2.3.3 Withstand Test in Excess of UL 1008 Requirements: The ATS shall be tested and rated to withstand an available fault or short-circuit current of 30 KA symmetrical minimum interrupting capacity, or as shown on the drawings. 2.3.4 Dielectric Tests: Tests shall be performed in accordance with NEMA ICS 1. Wiring of each control panel shall be subjected to voltage surge tests as stipulated in IEEE C37.90.1. Impulse withstand rating tests shall be performed accordance with the requirements of NEMA ICS 1. 2.3.5 Operational Tests: Tests shall be performed and shall demonstrate that the operational sequence of each ATS unit conforms to the requirements of the specifications with regard to operating transfer time, voltage, frequency, and timing intervals. PART 3 EXECUTION 3.1 INSTALLATION The ATS shall be installed as indicated and in accordance with approved manufacturer's instructions. 3.2 OPERATIONAL TESTING Following completion of the installation of each the ATS, the Contractor shall perform operational tests in accordance with the written instructions of the manufacturer after having made proper adjustments and settings to demonstrate that each the ATS functions satisfactorily and as specified.
The Contractor shall advise the Owner s Representative not less than 5 work days prior to the scheduled date or dates for operational testing, and shall provide certified field test reports to the Owner s Representative within 2 calendar weeks following successful completion of the operational tests. The test reports shall describe all adjustments and settings made and all operational tests performed.