VA 26 20 11-2010 ISOLATED POWER SYSTEMS.pdf

1、09-10 26 20 11 - 1 SECTION 26 20 11 ISOLATED POWER SYSTEMS SPEC WRITER NOTE: Delete between /-/ if not applicable to project. Also delete any other item or paragraph not applicable to the section and renumber the paragraphs. Note that the VA no longer installs new isolated power systems in human sur

2、gery rooms per VHA Directive 2008-011; this section only applies to renovation projects in which an existing isolated power system is altered, or to meet codes. PART 1 - GENERAL 1.1 DESCRIPTION This section specifies the furnishing, installation, and connection of isolated power systems. 1.2 RELATED

3、 WORK A. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items that are common to more than one section of Division 26. B. Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES (600 VOLTS AND BELOW): Cables and wiring. C. Section 26 05

4、26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS: Requirements for personnel safety and to provide a low impedance path for possible ground fault currents. D. Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS: Conduits for cables and wiring. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALIFI

5、CATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 SUBMITTALS A. Submit in accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. B. Shop Drawings: 1. Sufficient information shall be clearly presented to determine compliance with drawings and specifica

6、tions. 2. Include electrical ratings, dimensions, weights, mounting details, front view, side view, equipment and device arrangement, branch circuit overcurrent protection, wiring diagrams, materials, and connection diagrams. C. Manuals: Two weeks prior to the final inspection, submit four copies of

7、 the following to the /Resident Engineer/ /COTR/: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 20 11 - 2 1. Complete maintenance, operating and testing manuals, including wiring diagrams, technical data sheets, and information for orderin

8、g replaceable parts: a. Include complete “As Installed“ diagrams that indicate all items of equipment and their interconnecting wiring. b. Include complete diagrams of the internal wiring for each of the items of equipment, including “As Installed“ revisions of the diagrams. c. The wiring diagrams s

9、hall identify the terminals to facilitate installation, maintenance, operation, and testing. D. Certifications: Two weeks prior to the final inspection, submit four copies of the following to the /Resident Engineer/ /COTR/: 1. Certification by the manufacturer that the equipment conforms to the requ

10、irements of the drawings and specifications. 2. Certification by the isolated electrical power system equipment manufacturer that the isolating transformers have been tested and conform to the leakage current and sound level requirements specified. 3. Certification by the contractor that the equipme

11、nt has been properly installed, adjusted, and tested. 1.5 APPLICABLE PUBLICATIONS A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by basic designation

12、only. B. National Fire Protection Association (NFPA): 70-08 National Electrical Code (NEC) 99-05 Health Care Facilities C. Underwriters Laboratories, Inc. (UL): 6-07 . Electrical Rigid Metal Conduit-Steel 50-95 Enclosures for Electrical Equipment 797-07 . Electrical Metallic Tubing-Steel 1022-98 Lin

13、e Isolation Monitors 1047-03 Isolated Power Systems Equipment PART 2 - PRODUCTS 2.1 EQUIPMENT A. Isolated power systems shall be complete as shown on the drawings and include unitized isolated power units (IPUs), their associated remote outlets, power receptacles, grounding receptacles, equipotentia

14、l ground bus modules with power and grounding receptacles, line isolation monitors, and related circuitry. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 20 11 - 3 B. The isolated power systems shall be in accordance with NFPA 99 and UL 50,

15、 1022, and 1047. C. Incorporate the IPUs in factory-assembled units as shown on the detail drawings. House the isolation transformer, line isolation monitor, and circuit breaker panel board in each IPU unit. D. Line isolation monitors shall be in accordance with the following: 1. Article, “Line Isol

16、ation Monitor,“ in NFPA 99. 2. Dynamic-type, capable of detecting any combination of resistive and/or capacitive faults, including balanced, unbalanced, and hybrid faults. 3. Incorporate in each line isolation monitor, or on the front trim of the panel, a hazard meter or digital display, indicator l

17、ights, a buzzer with a local momentary-contact silencing switch or push-button, a test switch, and provisions for transmitting the alarm signals to a remote location. The hazard meter and indicator lights shall be conspicuously visible on the exterior face of the IPU. Transmission of the alarm signa

18、ls to remote locations up to several hundred feet from the monitor shall not unduly increase the leakage current for the system. E. Isolating transformers shall be in accordance with the following: 1. Single phase with primary and secondary voltages as indicated on the drawings. These ratings are fo

19、r continuous duty without the use of cooling fans. 2. Self-cooled by natural convection, dry, isolating windings, conventional (stacked design) type, with an electrostatic shield grounded between the primary and secondary windings, in accordance with NFPA 99. 3. Maximum temperature rises of material

20、s and components shall not exceed the values listed in Table 29.1 of UL 1047. 4. Cores shall be grain-oriented silicon steel. 5. Leakage current between each winding and ground shall be in compliance with UL 1047, Table 30.1, and Table 30.2. 6. Sound levels shall not exceed the following in accordan

21、ce with NEMA Standards: a. 5 kVA transformers or fewer: 28 dB. b. 7.5 kVA transformers: 32 dB. c. Larger transformers: 35 dB. 7. Temperature rise shall be limited 176 F 80 Cabove ambient temperature. 8. Each nameplate shall include the wiring diagram, leakage current, and sound level. Provided by IH

22、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 20 11 - 4 9. Install the transformers with adequate provisions for removal of the heat they produce. 10. Install the transformers so the sound levels shall not exceed the factory test sound levels for the sa

23、me transformers. F. Circuit breaker panels shall be in accordance with the following: 1. Circuit breaker-equipped, dead-front, with protection for the breaker handles. 2. Bus bars: a. Shall be copper with silver-plated joints. b. Panel to include ground bus. 3. Only the handles of the breakers shall

24、 be accessible. 4. Molded Case Circuit Breakers: a. Dimensions of the breakers shall be small enough so all of the components can be satisfactorily incorporated within the cabinets. b. A rugged, integral housing of molded insulating material. c. Silver alloy contacts. d. Arc quenchers and phase barr

25、iers for each pole. e. Quick-make, quick-break, operating mechanisms. f. A trip element for each pole, a common trip bar for all poles, and molded insulating material handle. g. Electrically and mechanically trip-free. h. Indicating operating handle showing the ON, TRIPPED, and OFF positions. 5. Pri

26、nt the circuit information on the directory cards, insert them into metal holders with non-flammable transparent covers, and mount the holders on the inside of the cabinet covers. Adequately identify each circuit. G. Power Receptacles: 1. UL-listed. 2. Non-hazardous areas; hospital grade, NEMA 5-20R

27、 unless otherwise indicated. H. Remote Ground Indicator Panel shall be in accordance with the following: 1. Monitor all of the isolated type electrical power systems as shown on the drawings. 2. Include a set of red and green indicator lights and a buzzer with a local, momentary-contact silencing sw

28、itch or push-button for each of the isolated-type electrical power systems monitored by the panel. All of the items shall operate in the same manner as the corresponding items at the line isolation monitor for the same isolated type electrical power system. 3. Stainless steel or anodized aluminum fa

29、ceplates. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 20 11 - 5 I. Clearly identify individual devices on the faceplates of all equipment. Method of identification shall be permanent such the labels will not be effected by the use of hos

30、pital-type cleaning materials. J. All equipment shall be flush-mounted as shown on the drawings. K. Use stainless steel for exposed faceplate surfaces of isolated power systems equipment in operating rooms. PART 3 - EXECUTION 3.1 INSTALLATION A. Installation shall be in accordance with manufacturers

31、 recommendations, NFPA, NEC, and as shown on the drawings. B. Branch circuits that are energized by the isolated type electrical power system shall conform to the following requirements: 1. Article “Impedance of Isolated Wiring,“ in NFPA 99. 2. Shall not be grounded, but rather protected by circuit

32、breakers with one pole for each conductor in the circuit. 3. Applicable paragraphs in specification Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES (600 VOLTS AND BELOW). 4. Branch circuits shall be as short as practicable to minimize the leakage currents. 5. Connect all of the

33、receptacles for each of the systems such that identical poles in all of the receptacles are connected to the same terminal of the isolating transformer. 6. Install the branch circuit wiring in rigid steel conduit or electrical metallic tubing. Do not use wire lubricating compound on branch circuits

34、connected to the isolated power system. 3.2 FIELD TESTING A. Once the equipment and all of the interconnecting circuits have been completely installed prior to the final inspection, provide testing equipment and perform the following tests, in the presence of the / Resident Engineer / COTR /, to ind

35、icate that the systems operate properly in every respect. 1. Test to verify that all of the wiring is properly connected and clear of ground faults, shorts, and open circuit defects. 2. Test to verify that all of the equipment is operating properly. 3. Tests: a. Make a calibration test on each of th

36、e micro-ammeters. The tests shall be accurate within 3%. b. With all of the circuit breakers closed and without any equipment plugged into the receptacles, read and record the inherent total leakage current indicated by the micro-ammeter. The leakage currents shall be small enough to indicate that a

37、ll of the Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 20 11 - 6 equipment and circuit installations are satisfactory for proper operation of the equipment. Submit four copies of the certified data sheets of the test. c. With an electrica

38、l test, demonstrate that identical poles of all of the power receptacles for each of the isolated-type electrical power systems are connected to the same terminal of the isolating transformer. d. With an electrical test, demonstrate that either terminal of each of the isolating transformers, when sh

39、orted to ground in one of the power receptacles, will actuate the ground alarm without causing the circuit breaker to trip. e. Connect not fewer than eight pieces of equipment successively to the power receptacles for each of the isolated-type electrical power systems. As each item is connected, rea

40、d and record the total leakage current indicated by the micro-ammeter. Each of the readings should be larger than the preceding reading. f. In addition, perform all manufacturers recommended test procedures of the Isolated Power System to supplement the above tests. g. Furnish a portable, precision

41、laboratory quality test box suitable for making the above tests that includes a multi-position rotary switch with appropriate resistors and a cord with a plug. Test box shall be transferred to the /Resident Engineer/ /COTR/ upon satisfactory completion of all tests. 4. When any defects are detected,

42、 make repairs or install replacement components and repeat the tests as requested by the /Resident Engineer/ /COTR/. B. At the final inspection, demonstrate that the isolated electrical power systems operate properly in the presence of the /Resident Engineer/ /COTR/. - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-