16-SAMSS-519

Materials System Specification16-SAMSS-519 Indoor Switchboard - Low Voltage Electrical Substations Equipment Standards Committee Members Ghamdi, Mohammed Ahmed, Chairman Carlson, Ronald Wayne, Vice Chairman Maghrabi, Ibrahim Mohammad Ramadhan, Mohammad Jafar Hartman, Ralph August Helfrich, Cory Allan Refai, Jobran Ali Stansbury, Merlin Chip Lowe, John Ojan, Jawad Ali Gopal, Uarutharaja Nazzawi, Abdullah Omar Fayez, Hamad Abdullah 6 May 2007 Saudi Aramco DeskTop Standards Table of Contents 1 2 3 4 5 6 7 8 9 10 11 12 13 Scope............................................................ Conflicts and Deviations............................... References.................................................... Definitions..................................................... General......................................................... Rating............................................................ Service Conditions........................................ Enclosures.................................................... Conductors.................................................... Grounding..................................................... Switching Devices......................................... Metering........................................................ Nameplates................................................... 2 2 2 3 4 5 5 5 6 7 7 8 9 Previous Issue: 29 June 2005 Next Planned Update: 5 May 2012 Page 1 of 10 Primary contact: Carlson, Ronald Wayne on 966-3-8746128 Copyright©Saudi Aramco 2007. All rights reserved. except to the extent that they explain mandatory requirements contained in this SAMSS 3 References The following is a summary of all the documents which have been mentioned within this Specification.3 If there are any conflicts between this Specification and associated purchasing.2 Industry Codes and Standards American National Standards Institute ANSI C37. this specification shall take precedence. The specific part(s) of these documents which are applicable have been identified throughout this Specification.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard .1 Saudi Aramco References Saudi Aramco Materials System Specifications 16-SAMSS-518 16-SAMSS-521 3.2 2. These comments are not mandatory. low voltage switchboards rated a maximum of 2000A and 600 V.Low Voltage Indoor Transfer Switch .1 2. 2 Conflicts and Deviations 2. project or engineering documents.Low Voltage 1 Scope This Specification defines the mandatory requirements for indoor. Direct all requests to deviate from this Specification in writing to the Company or Buyer Representative. 3. The designation "Commentary" is used to label a sub-paragraph that contains comments that are explanatory or advisory.13 Standard for Low-Voltage AC Power Circuit Breakers used in Enclosures Panelboard . who shall follow internal company waiver procedure.Low Voltage National Electrical Manufacturers Association NEMA 250 NEMA AB 1 NEMA PB 2 Enclosures for Electrical Equipment (1000 Volts Maximum) Molded Case Circuit Breakers and Molded Case Switches Deadfront Distribution Switchboards Page 2 of 10 . For example.g. Commentary Note: For this equipment in the intended application "low voltage" is essentially limited to 600 V.Low Voltage National Fire Protection Association ANSI/NFPA 70 National Electrical Code Underwriters Laboratories. Deadfront: As per the NEMA PB 2 definition. If necessary. Panelboard: equipment manufactured per the requirements of 16-SAMSS-518. Main Circuit Disconnector: device to isolate the switchboard from the main incoming circuit. Low Voltage: Means a voltage level of less than 1000 volts. The process is not reversible and the connector becomes a permanent part of the conductor. Inc. cable. Front Accessible: As per the NEMA PB 2 definition. Discrete: Device which only performs one function. Page 3 of 10 . The connector can only be removed from the conductor by either cutting the conductor or cutting the connector. relay contacts. a switchboard in which all bus and device connections are accessible from the front. terminal block studs.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard . etc.. devices and parts which are expected to carry current as part of their normal function (e. a switchboard which has no exposed live parts on the front.). a discrete voltmeter only displays voltage. Conductor: All material. a standard tool. The process is reversible and the connector can be removed from the conductor without cutting the conductor or the connector. UL 891 4 Definitions Compression connectors: are connectors which are compressed onto the conductor using a die and high mechanical force. a limited number of devices shall be permitted to be removed to achieve this accessibility. Safety Requirements for Switchboards Main Circuit: All the conductive parts of an assembly included in a circuit which is intended to transmit electrical energy to the connected loads. generally. Mechanical connectors: connectors which are attached onto the conductor using. bus. Transfer Switch: equipment manufactured per the requirements of 16-SAMSS-521.Low Voltage PEM: Parent Equipment Manufacturer. Switchboard or assembly: The complete assemblage of switching assemblies as it will appear after installation by the Buyer.1 5. 5 General 5.3 5.5 . the load shall be assumed to be a 125 kVA distribution transformer. If the type of load is not specified.) and shall be ready for operation when the feeder and control cables are connected. Switching assembly: The assembly of switching devices and associated control and auxiliary equipment which controls or distributes power to a single load or via a single circuit. For example. protective relaying. This specification shall take precedence over any referenced third party document.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard . etc. this document shall be the edition which was in effect on the date of the Quotation Request.). Page 4 of 10 5. have been fully tested and are fully supported by the PEM. UL. Spare: switching assemblies: are completely developed to serve the type of load indicated (i. with no modifications other than the installation of devices within the compartment door.. control and auxiliary circuits. This manufacturer (1) has the legal authority to license the assembly of this equipment to others (2) is responsible for the technical performance of the equipment and (3) will be able to provide after-sales support and parts for the equipment. Whenever this specification requires compliance to a third party document (e. ANSI. including main switching devices.g. The manufacturer who designed the equipment and who confirmed the design performance through certified design/type tests. Space: switching assemblies: are not equipped with a switching device but shall be developed to accept.4 5. All requirements of this specification must be implemented using standard designs which have been approved. etc. if there are any conflicts between this Specification and associated project or engineering documents. instrument and control transformers.2 Terms in bold font are defined within Section 3. this specification shall take precedence.e. a switching device suitable for a 125 kVA distribution transformer. Switching Device: A device designed to make or break current.. Refer to Section 2 for direction on conflict resolution between documents. 2 8.. 8 Enclosures 8.6 5.7 6 Switchboards shall be manufactured per NFPA 70 (i. For a period of 1 month. deadfront. unless a higher altitude is specified within Data Schedule 1. and free standing. completely enclosed.1 8. Average temperature. Relative humidity (average value): a) b) For a period of 24 hours. does not exceed 75%. NEC) Article 384.2 6. is a maximum of 30 degrees. 7. Enclosures shall meet the requirements of either Type 1.Low Voltage 5. measured over a period of 1 month.1 6.1 Ambient air temperature: a) b) c) 7.2 A maximum of 40 degrees.3 Altitude is less than 1000 meters. UL 891 and NEMA PB 2. A space heater system shall not be installed within the switchboard enclosure(s). Page 5 of 10 . All temperatures expressed within this specification are in Celsius units Rating 6. does not exceed 70%. A minimum of 0 degrees.3 Rated Duty: Continuous Rated Current (maximum): 2000A Short Circuit interrupting rating (minimum): 10 kA rms 7 Service Conditions Switchboards shall be suitable for continuous operation under the following service conditions: 7.e.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard . 2 or 5 per NEMA 250.3 Shall be front accessible. four bolts shall be provided (i. For butt joints with splice plates.1. Plating of the copper. The main circuit bus system shall be of rigid material (i. silver or alloys of these materials with the following exceptions: 9.e. two bolts at each overlap).1 9. 9. mechanical or compression connectors with the following exceptions: Exceptions: a) b) All wire/cable connections to the main circuit bus system shall be terminated using two hole compression connectors. 9.2.2.1.. Connectors supplied as integral parts or components of manufactured equipment such as molded case circuit breakers provided the connectors are approved for copper conductors. cable or flexible conductors shall not be used). two bolts shall be provided. silver or copper/silver alloy base conductor material is acceptable.7 Main circuit conductor system shall be copper and sized so the temperature rise does not exceed 65°C. Bus bar mating surfaces shall be either silver or tin plated.2 For overlapping joints. If a neutral has been specified.Low Voltage 9 Conductors 9.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard .2 Parts which are internal to a pre-manufactured device (e.. Conductors shall be terminated using either one or two hole. All wire/cable 250 MCM and larger or 120 mm² or larger shall be terminated using compression connectors.5 9.1.g.1 All conductors shall be copper. Page 6 of 10 .4 9.2 All joints of the main circuit phase bus system shall be bolted with a minimum of two bolts as follows: 9.1 9. internals of circuit breaker).3 9..3 9.e. a full capacity neutral bus shall be provided.6 9. In this condition the compartment door shall be able to be closed to prevent a person from contacting any electrically energized parts. operating mechanism.1 11. The switch shall be padlockable in the OPEN position.3 If a main circuit disconnector is provided. Commentary Note: For example. Bus design shall accommodate the termination of a two hole connector at each end of the bus.. Equipped with a field adjustable electronic trip unit (i.1 11.4 Fully field maintainable (e.1 Shall be withdrawable and padlockable in the fully withdrawn position.4.2 A spare switching device shall be provided for every five devices of the same rating.4. "Type A" per NEMA AB1). Circuit breakers with frame sizes exceeding 600-A shall be equipped with the following 11. 3-400A breakers and 3-150A breakers.2 11. it shall be equipped with the following additional features: 11.Low Voltage 10 Grounding A ground bus shall be provided extending the full length of the switchboard. etc..3. Shall be equipped with adjustable instantaneous and inverse-time ground fault detection and tripping.e.1 11.1.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard .5 Switching assembly spare and space allotment shall be as follows: 11. 11.5. 11. A minimum of one space shall be provided for every ten or portion of ten connected feeder circuits.g.). Page 7 of 10 .3. If an incoming disconnect switch is provided. assume the switchboard contained 6-225A breakers.2 Breakers operating at greater than 240 V shall be equipped with padlockable lock-off devices.5. pole contacts.5.2 11. 1 spare 225A switching assembly would be required to comply with paragraph 11. the switch assembly is not required to be withdrawable providing the open switch poles are visible with the compartment door open. 11 Switching Devices 11. b) 12. ammeters.2.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard .) shall not be installed within individual switching assemblies.5. Minimum overload capacity of: i) ii) iii) c) d) 1.7 11. voltmeters.1 Main incoming amperage and voltage metering shall be provided for each switchboard assembly. These meters shall not require a control power to function. Ammeter/amperage input rating shall not be greater than 25 A. etc.2.g. Discrete metering systems shall have the following characteristics: a) b) 2% or better full scale accuracy.6 11. Voltmeter: 2 times measurement range for 1 second.8 Ground fault protection shall not be installed on any incoming or outgoing circuits.Low Voltage 2 spaces are required to comply with 11. the switchboard would be equipped with 1 spare 225A breaker and 2 SPACES. a) and b): Ammeter monitoring the motor space heater system. Voltmeter/voltage input rating shall not be greater than 150 V. 11. This metering shall have the following requirements: a) Discrete voltmeter(s) shall display a voltage indication of all three phases (not necessarily all at once). Ammeters: 10 times measurement range for 5 seconds. Amperage indication shall be provided of all three phases (not necessarily all at once).2 times measurement range continuously. Therefore. pf meters. Low voltage panelboards installed within the switchboard shall comply with 16-SAMSS-518. Page 8 of 10 .. Transfer switch assemblies installed within the switchboard shall comply with 16-SAMSS-521. 12 Metering 12. Exception: to 12.2 Discrete meters (e. Page 9 of 10 . Revision Summary 6 May 2007 Major revision.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard .Low Voltage 13 Nameplates White Nameplates with black lettering shall be provided to identify the panelboard with the tag number indicated within Data Schedule 1. ______ AWG.. mm²~! Page 10 of 10 . 3/3 ____. ______________________________________________________ 2 3 Buyer's B./phase and size of main circuit supply conductors: _____ /ph. 200% ___ Site altitude (if greater than 1000 meters) _________ meters Main circuit supply conductor connectors(if applicable): Supplied by Supplier: YES ( ). NO ___ If YES.O.Document Responsibility: Electrical Substations Equipment Issue Date: 6 May 2007 Next Planned Update: 5 May 2012 16-SAMSS-519 Indoor Switchboard .I.Low Voltage Data Schedule 1 16-SAMSS-519: Indoor Switchboard – Low Voltage (Information to be supplied to Supplier) Line # 1 Buyer's Quotation Request/ Purchase Order No.___________ Panelboard Tag No. MCM.__________________________ Service information: 20 33 35 40 41 43 50 52 54 55 56 57 58 59 As indicated on the attached reference documents ___ or the following: System frequency: 60 Hz _____.________. trip rating ______ A If YES. No./J. NO ( ) If YES: No. 3/4 ___ Rated Current: _______ A (2000A maximum) Short Circuit Interrupting Rating: _________ kA (10kA minimum) Rated voltage: _________ (600V maximum) Incoming breaker required: YES ___. 1/3___. NO ____: Neutral bus required: YES ___. 50 Hz _____ Number of Phases/Wires 1/2___. rated current of neutral bus as a % of phase bus: 100% ___. Line Item No.