Description
Materials System Specification34-SAMSS-820 Instrument Control Cabinets – Indoor Instrumentation Standards Committee Members Awami, Luay Hussain, Chairman Tuin, Rienk , Vice Chairman Bogusz, Zbigniew Jozef Dakhil, Tareq Khalil Dhafeeri, Farhan Taieh Ell, Steven Tal Fadley, Gary Lowell Qaffas, Saleh Abdal Wahab Mahmood, Balal Trembley, Robert James Falkenberg, Anton Raymond Grainger, John Francis Jumah, Yousif Ahmed Khalifa, Ali Hussain Madhi, Fawaz Abdullah Qarni, Mahdi Ali 28 May 2007 Saudi Aramco DeskTop Standards Table of Contents 1 2 3 4 5 6 7 8 Scope............................................................. 2 Conflicts and Deviations................................. 2 References..................................................... 3 Definitions....................................................... 4 General Requirements................................... 4 Design............................................................ 5 Electrical........................................................ 8 Testing and Inspection................................. 21 Previous Issue: 5 October 2005 Next Planned Update: 1 November 2010 Revised paragraphs are indicated in the right margin Primary contact: Abeediah, Saeed Mohammad on 966-3-8752559 Copyright©Saudi Aramco 2007. All rights reserved. Page 1 of 21 Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 1 Scope This specification defines the requirements for instrument control panels, control cabinets, and marshalling cabinets for location in electrically unclassified airconditioned buildings. Programmable Logic Controller (PLC), auxiliary systems, and Rotating Equipment Protection control cabinets must adhere to this specification. Excluded from this specification are: a) b) c) d) e) f) Vendor standard Fire Detection / Suppression Panels / Cabinets used for building protection. Vendor standard Security Alarm Panels / Cabinets. System Cabinets for Distributed Control System (DCS) except as referenced in 23-SAMSS-010. Consoles and server cabinets for Distributed Control Systems (DCS). Control panels that are provided as part of packaged Units. ESD System Cabinets except as referenced in 34-SAMSS-623. 2 Conflicts and Deviations 2.1 Any conflicts between this specification and their applicable Saudi Aramco Materials System Specifications (SAMSS), Engineering Standards (SAESs), Standard Drawings (SASDs), or industry standards, codes and forms shall be resolved in writing by the Company or Buyer Representative through the Manager, Process & Control Systems Department of Saudi Aramco, Dhahran. Direct all requests to deviate from this specification in writing to the Company or Buyer Representative, who shall follow internal company procedure SAEP-302 and forward such requests to the Manager, Process & Control Systems Department of Saudi Aramco, Dhahran. The designation "Commentary" is used to label a sub-paragraph that contains comments that are explanatory or advisory. These comments are not mandatory, except to the extent that they explain mandatory requirements contained in this SAMSS. 2.2 2.3 Page 2 of 21 3.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 3 References Referenced standards and specifications shall be the latest edition.1 Saudi Aramco References Saudi Aramco Engineering Procedure SAEP-302 Instructions for Obtaining a Waiver of a Mandatory Saudi Aramco Engineering Requirement Saudi Aramco Materials System Specifications 23-SAMSS-010 34-SAMSS-623 Distributed Control Systems Programmable Controller Based ESD Systems Saudi Aramco Inspection Requirements 175-343100 3. Inc. Labels and Tags for Control Centers Underwriters Laboratories.2 Industry Codes and Standards National Fire Protection Association NFPA 70 National Electrical Code Instrument Control Panels National Electrical Manufacturers Association NEMA ICS 6 NEMA 250 Enclosures for Industrial Controls and Systems Enclosures for Electrical Equipment (1000 Volts Maximum) International Electro-Technical Commission IEC 61000-4-3 Radiated Electromagnetic Field Requirements International Society for Measurement and Control ISA RP60. unless stated otherwise. revision or addendum in effect on the date of the Purchase Order. UL 94 UL Standard for Safety Test for Flammability of Plastic Materials for Parts in Devices and Appliances Page 3 of 21 .6 Nameplates. 5. 5. Exception: This requirement does not apply to the vendor's standard documentation. PCs or other heat generating components. totalizers. When not critical. Page 4 of 21 . 5 General Requirements 5.3 Heat dissipation calculations shall be submitted for any cabinet that houses power supplies.2 Environmental Conditions All cabinet equipment and wiring shall be designed for continuous operation at 50 °C. Control Cabinet: An enclosed structure containing electronic equipment and wiring for process control / status devices. The calculations shall show that the components installed inside the cabinet will not be exposed to a temperature above their temperature rating. pushbuttons.g. Marshalling Cabinet: A cabinet containing mainly terminal strips and wire terminations. indicating lights. pullbuttons. Cabinets: Generically used within this specification. refers to all of the above. etc.). Commentary Note: The temperature of 50°C allows for a 35°C room ambient plus a 15°C rise within the cabinet. Cabinets containing DCS field termination assemblies (FTAs) should be treated as control cabinets.1 Engineering Units All dimensions and measurements shall be in the "International System of Units" (SI). The field wiring is normally terminated in the Marshalling Cabinet. (The front surface of a control cabinet may include a control panel.). annunciators..Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 4 Definitions Control Panel: A surface with cut-out(s) used to mount control devices and/or instrument indicators (e. and may be followed by the equivalent value in English units between brackets. meters. and relative humidity 80% maximum (non-condensing) and 20% minimum. the equivalent dimensions may be rounded off to their nearest practical value. name plates. 6.2. Item c) shall be issued with Saudi Aramco drawing numbers and completed in the Intergraph or convertible format. raceways. contain the following information: a) Cabinet fabrication drawings showing dimensions for exterior. fuses. 6.1 Style The cabinets shall be rigid and self-supporting. internal cabinet segregation. pushbuttons. Cabinet layout drawings showing the location of all electronic equipment. with tag names and equipment/terminal identification. rack-mounted equipment.2. power supplies. Page 5 of 21 . annunciators.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 6 Design 6. plastic ducts. removable plates. and shipping breaks. Instruments and electronic accessories shall be wired in accordance with this specification.2. ventilation louvers. lighting and grounding strips. Electronic equipment manufacturer and model numbers shall be shown.3 All instruction manuals and technical information supplied with components received by the Cabinet Fabricator shall be placed in a folder or binder and shipped with the cabinet. The detailed drawings. internal frame supports/bracing.2 The Cabinet Fabricator shall supply Saudi Aramco detailed drawings for review and approval. doors and door swings. Wiring diagrams showing termination strips and all electronic interconnections.2. The cabinets may be floor or wall mounted.1 The cabinet shall be a NEMA Type 1 per NEMA 250 and NEMA ICS 6. lifting bolts. terminal strips.1 6.4 6. b) c) Items a) and b) shall be drawn to scale and supplied as Vendor drawings for Saudi Aramco review and approval. shall as a minimum. Indoor cabinets shall be made of metal. All Vendor literature and drawings shall be of sufficient size and quality to be clearly legible.3. convenience outlets. 6.3 Construction 6. openings.2 Drawings 6. 3. redundant fans shall be provided.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 6.7 6.11 6. from the front surface to the surface of rear terminal blocks. All doors shall be dust-tight and reinforced against buckling.4 6. In both cases. Louvers installed at the top of cabinets shall be protected by a screen or shroud to prevent debris from falling into the cabinet. The preferred design is to divide a 76 cm (30 inch) deep cabinet into 38 cm (15 inch) sections with front and rear access. Fans may be used within Cabinets or Power supplies to assist in heat removal and cabinet ventilation. If the fan(s) are only required to dissipate heat when the HVAC is not running. shall not be more than 46 cm (18 inches) deep to provide for safe access.4. A minimum of primer. Louvers and filters installed within cabinet doors are acceptable. All doors must be capable of swinging at least 90-degrees open at the installed location. corrosion resistant hardware.1 The exterior and interior cabinet finish shall be the Cabinet Fabricator's standard finish. Cabinet support bracing shall not restrict maintenance access to chassis.3 Cabinets requiring heat dissipation shall be convection-ventilated. unless otherwise specified in the Purchase Order.3.9 6. If the fans are required to dissipate heat when the HVAC is running. removable filter screens inserted behind slotted louver inlets.3.3.3. modules or components. undercoat and finishing coat of enamel or lacquer Page 6 of 21 . Each cabinet shall be provided with removable lifting rings.5 6.3. the interior shall be an open-frame construction. The marshalling cabinets. Convection-ventilated cabinets shall be provided with readily accessible. 6.3. a single fan is adequate.2 6.3.3.6 6. Filters shall slide into preformed grooves or be fastened with removable.8 6. Where two or more front sections are required for a Control Panel. Cabinet doors shall be full-height. fan failure or overtemperature detection and alarm are required in the DCS.10 6. The maximum door width shall be 900 mm (36 inches) unless otherwise specified in the Purchase Order.4 Cabinet Finish 6.3. The nameplate.5.6 6. off-white. Where abbreviations are used.5 Interior cabinet color shall be white or of a light color such as light gray.4. Nameplates 6. etc.5.3 6.5. The nameplates shall be permanently attached.6. front and rear. as a minimum. indicating lights and other through-mounted devices shall be identified with the service description on the front. white-black-white (information engraved into the black core) with white surface.1 Unless otherwise specified in the Purchase Order. each cabinet shall be provided with the following spare capacity to allow for future system modifications: a) 20% installed spare terminal blocks of each terminal block type used. ISA RP60.2 6. Appendix A and C. Where possible. shall be the cabinet name/number as given in the cabinet drawings. The rear of the above devices shall be identified with the device tag number. field termination assemblies. 6. Control panel pushbuttons. etc. 6.5.4 6. Adhesives are allowed for indoor panels. unless otherwise specified in the purchase order.5.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor is required. Electrostatic applied powder paint coatings which are then baked (such as polyester urethane) is acceptable. they shall be consistent with facility practices. Nameplates shall be made from laminated plastic. Individual rack modules are not required to have permanent nameplates attached. Each cabinet. Spare terminal blocks are to be distributed to match the layout of required spare I/O modules.5. shall be identified with a nameplate located above each door or pair of doors. nameplate abbreviations shall be avoided. relays. Instruments and accessories mounted inside the cabinet shall be identified with a nameplate showing the tag number.2 6.6.1 Nameplates for cabinets and panels letter height and spacing shall follow ISA RP60.5 6.6 (Appendix B) shall be used to keep abbreviations consistent where facility practice is not established. switches. dull finish.6 Cabinet and Panel Spare Requirements 6. Page 7 of 21 . all input and output points.2 The Cabinet Fabricator shall supply a minimum of two (2) spare fuses or 10% (whichever is greater) for each type of general power and termination strip fuses used within each cabinet..Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 Commentary Note: 34-SAMSS-820 Instrument Control Cabinets – Indoor The 20% spare terminal requirement is intended to be used for the 20% spare cabling required in homerun cables.1 Power Supplies feeding process instruments shall be powered from instrument circuit power distribution panels. Exception: If the cabinet is equipped with only one circuit breaker for cabinet lighting. For less than ten relay installations. Page 8 of 21 . field switch contacts.e. 6..1.6. twowire analog transmission loops. knife-switch-type terminal blocks). Exceptions: 1) Wiring connected to I/O modules or interfaces containing individual current-limiting circuit protection does not require fuses. etc. The cabinet shall be furnished with a minimum of 20% spare circuit breakers. flow computers. spare breakers are not required.2 Power wiring for field instruments. 7. 7 Electrical 7. etc.1 Power Supply 7.1. field termination assemblies.. This requirement includes supplying spares for fuses integral to installed electronics (i. Instrumentation circuit breakers and distribution strips shall not provide power to noninstrumentation circuits. Exception: The above requirement does not apply on cabinets where only one relay is installed for fan failure or alarm. one spare base should be installed. shall be individually fused and provided with a means of disconnecting the power without disturbing terminated wiring (e. It is not intended to be additional terminals on top of terminals used to terminate spare pairs/triads.g.). Each distribution strip shall be dedicated to a single voltage level. b) 10% spare relay bases in cabinets where there are ten relays or more. the manufacturer's standard method of load sharing shall apply.5 7. 60 ± 2 Hz 24 VDC (4-20 mA) 24 VDC 120 VAC.28.1.1.6 7. location. Power supply outputs shall be individually fused or protected by a circuit breaker.1. Supplies to DC instrument loads: Voltage stabilization shall be provided to maintain the output voltage within tolerable limits of the loads served.7 7.2 VDC 110 .126 VAC NEC Class 1 or 2 1 or 3 1 or 3 1 or 2 1 or 2 1 or 3 Annunciator Power Shutdown and Isolation System including relay coils Field Switch Contacts Analog Signal (Loop Power) Instrumentation Power Note: The basis for the upper DC voltage variations are due to installations where battery back-up is used without voltage suppression and the batteries receive periodic charging. Power supplies shall be identical whenever possible for interchangeability and spare part requirements. 60 ± 2 Hz Tolerance 21 .28.1.3 Equipment shall operate at the supply voltages shown in Table 1.1.4 Where multiple on-line DC power supplies are connected to a single power bus.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 2) 34-SAMSS-820 Instrument Control Cabinets – Indoor Low Voltage wiring connected directly to I/O.8 Page 9 of 21 . taking into account the maximum expected load at the maximum operating temperature of the cabinet (50°C). diode auctioning shall be used to facilitate load balancing in the event of a single power supply failure. 7. and ampacity ratings must be properly sized and coordinated.1.28. (See paragraph 7. Where multiple DC power supplies are an integral part of a manufacturer's standard product.126 VAC 21 .2 VDC 21 . 7.6) Commentary Note: Fuse application. Table 1 – Supply Voltage System/Device Nominal 24 VDC 125 VDC 120 VAC. 7. Jumper bars or preformed jumper combs designed for the specific terminal blocks being used are acceptable methods of distributing power supply wiring.2 VDC 113 . Power Supply terminal block distribution wiring shall not be daisychained using wires or crimp connectors.141 VDC 110 . 2) Lower Value Spacing is for wires separated by: a) One metal conduit or b) A 1/16-in. thick grounded steel divider. When wiring must be extended. Table 2 Signal Category Milli Volt T/C RTD 4-20 mA 24 VDC 125 VDC 120 VAC Copper Network Cable Milli Volt T/C RTD 0 0 0 0 25 25 150 75 150 75 0 0 4-20 mA Analog 24 VDC 0 0 0 0 0 0 75 25 75 25 0 0 24 VDC Power/ Digital 25 25 0 0 0 0 25 0 75 0 0 0 125 VDC 150 75 75 25 25 0 0 0 0 0 50 25 120 VAC 150 75 75 25 75 0 0 0 0 0 75 50 Copper Network Cable 0 0 0 0 0 0 50 25 75 50 0 0 Notes: 1) Upper Value Spacing is for wires in plastic ducts.3.1 7. 7. Twist-on wire nut connectors shall not be used for making any electrical instrumentation terminations.2 Wire Installation 7. Signal Categories with upper values of zero separation may be mixed in a plastic duct. 3) Voltages shown are nominal.2.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 7. Segregation of parallel wiring internal to cabinets shall adhere to the following Table 2. Signal Categories shall not be mixed within any single multicore cable.2 7. Page 10 of 21 . connections shall be made via terminal blocks. but not within a single multipair cable. All dimensions are shown in millimeters.1 Separate plastic ducts are preferable for all Signal Categories that require separation for organization and noise reduction. Example: 24 VDC digital and 24 VDC 4-20 mA may be run in the same plastic duct.2.2.3 Splices are not permitted in wiring.2. g. with a minimum temperature rating of 75°C. to intermediate terminals within the same building by the use of manufactured multi-conductor cable and plug connectors. minimum size 20 AWG. This process makes it easier to land field wires on-site and minimizes possible damage to vendor equipment during termination of field wires.4 Wiring Methods 7. field termination assemblies. removable. PVC-insulated or cross-linked polyethylene.1 General 120 VAC power wiring shall be minimum 14 AWG stranded. Insulated ring lugs. 300 V for multicore cable.1 Cabinets containing electronic equipment with field inputs/outputs (I/O) (e.2 Exposed electrical connections with voltages greater than nominal 48 volts AC/DC.3. Electronic signal wire shall be stranded copper. Page 11 of 21 7. 300 V for single conductors or a minimum 22 AWG.4. When screw-type terminals are provided on instruments and other electrical devices..3 Wire Specifications 7. Wire insulation shall be cross-linked polyethylene. minimum. Wire insulation shall be rated for 600 volts. Commentary Note: Field wiring shall be terminated on the intermediate terminal strips (by Others).2 Wiring that is required to be segregated shall cross at right angles and the spacing shall be maintained as close as practicable to that shown in Table 2.2 7. mounted on cabinet doors. 7.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 7. copper.3.2.6 for low voltage wiring exceptions to the use of intermediate terminal strips. I/O modules. insulating plastic covers (or equivalent).4.3 . solderless crimp/compression connectors shall be used for connecting stranded copper conductors. 7. or PTFE. Exception: See 7. shall have exposed wiring/terminations shrouded by transparent.) shall have the I/O device pre-wired to: 1) 2) intermediate terminal strips within the same cabinet shipping section.3. etc. PVC. 7.4. Special electronic signal wires shall be as described in the Purchase Order. 75°C. or. 4 . pulse and frequency signals under 1 Volt such as thermocouples.5 Annunciator Wiring 7. 7. Solid State / Relay Control Cabinets or Control Panels with ESD pushbuttons ).fork connectors. This wiring method assures that all wires can be accessed without interference from other wires as the wire duct is filled. Where special cases of mixed ESD / Non-ESD signals occur in one cabinet or control panel (e. Annunciator(s) shall have a lamp/horn test. Terminal strip spacing shall allow ample room for plastic wire ducts and permit lacing of cables. Each terminal strip shall be labeled above or below with the terminal strip number. microamp.7. as shown on wiring diagrams.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor locking-fork or flanged. 7. 7.5.7. analyzer elements. vibration elements.5. and which do not contain the conductor within a clamp or yoke. specifically designed to hold the connector on the terminal in the event of loosening of the terminal screw. annunciator shall have a horn relay wired to terminals for connection to the remote horn system.6 Wiring for Millivolt.2 The termination method shall be channel (rail)-mounted terminal blocks. resistance temperature detectors (RTD). and fanning of individual wires to termination points.7 Terminal Strips 7. Pulse and Frequency Signals Wiring for millivolt.7. Microamp. Commentary Note: Screw-type terminals are defined as those in which the termination method involves the direct compression of the conductor by the underside of the screw head.g.. terminal strips for Emergency Page 12 of 21 7.3 7. Terminals for similar (AC or DC) current service shall be grouped together and physically separated from terminals for different service by means of dividers.7.2 When specified. shall be used on all such connections.1 7. separate mounting rails or separate enclosures. acknowledge and reset button unless otherwise specified in the Purchase Order. thermistor elements and transmitters with pulse outputs may be directly connected to the I/O unless otherwise specified in the Purchase Order.1 7. Standoffs for terminal strips are preferred to bring the terminal blocks forward to be flush with the top of the plastic wire duct. 5 Wiring for a given instrument loop shall be terminated on adjacent terminals on the terminal strip in order to organize and group all loop wiring.7. All terminal blocks shall be channel (rail)-mounted. strip-type. Page 13 of 21 7. The terminal block must be suited for the wire size. halogen free.8. termination of wiring which has individual strands of the copper conductor tinned during manufacture (typical of shield drain wires or for corrosion protection) is acceptable.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor Shutdown (ESD) wiring shall be completely separate from all other wiring including power.7. A fused terminal block shall have a blown-fuse indicator.4 7.3 7. 7. the use of ferrules to daisy chain is not acceptable. the thickness of the terminals shall be 5 mm or higher. or equivalent. As a minimum. V0.8.1 7. However.2 No more than two bare wires shall be connected to each side of a single terminal block.6 7. The disconnect levers for fused terminals and knife-switch terminals shall be hinged. high strength material such as polyamide or equivalent in accordance with UL 94.8. visual sight indication through a port.8. The use of crimp-on ferrules shall follow the manufacturer's guidelines and the following: a) b) One or two wire ferrule is acceptable. This may be a Light Emitting Diode (LED).6 7.8 Terminal Blocks 7. Terminals shall be made of fire retardant. Brittle materials such as melamine shall not be used.8. 7.7 . However. Only one ferrule shall be connected to each side of a single terminal block. Wires terminated on these terminal blocks shall not have the bare ends coated with or dipped in solder ("tinned").8. annunciator points and signal wiring shall be separately grouped and separated by dividers. Terminals for various types of general wiring (AC or DC). All terminals shall be numbered on both sides.8. with a tubular box clamp connector and compression bar or yoke for wire termination. Direct termination of the bare wire end is acceptable.5 7. control and instrumentation. 8.9.3. Wire markers shall be completely presented without being obscured by the duct. the maximum plastic wire duct fill (including spare capacity) shall not exceed 75% of its depth. 7. wiring shall be neatly loomed and secured with plastic spiral wrapping or tiewraps and anchors. Plastic wire ducts shall be mounted using screws.3 7. Wiring between movable parts such as doors shall be installed in flexible hoses.9 Wire Ducts and Looms 7.5 7. Multiple-deck and spring type terminal blocks shall not be used. The maximum conduit/plastic wire duct fill (including spare capacity) shall not exceed the heat requirements of NFPA 70 Section 300.9 Page 14 of 21 . Wire ducts for ESD wiring shall not contain any other types of wiring. Glands or protective grommets shall be used.6 7.1 Plastic wire ducts with removable covers shall be installed in cabinets as required to provide a means of routing and organizing wiring.8. Where space limitations preclude the use of plastic wire ducts.7 7.8.9 7.9.9. Exception: When provided as an integral part of manufactured electronic equipment. 7.17.9. Vendor-installed cables shall be supported and provided with a strainrelief mechanism for cable connectors.9.4 7. Loomed wiring shall not be installed near sharp-edged surfaces.9.9.8 Ferrules shall be provided with plastic insulating collars. A minimum of 50 mm shall be maintained between the duct and terminal strips. In addition to the above.2 7.9. Terminal blocks with a narrow. Wiring shall not be threaded through undressed access holes.9. but never for direct termination of field cabling. multiple-deck terminal blocks are allowed.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor c) 7.8 7. recessed screw entrance which require a special screwdriver or wrench may be used only if the insulation material is per Paragraph 7. Double-sided tape is unacceptable. 1 Cables with connector plugs shall be tagged at each end.10 Wire Color Coding AC Power Supply: DC Power Supply: Hot Neutral Ground Negative Positive Black White or gray Green or green with yellow tracer Black Red If the wire insulation cannot be color-coded as above. Blue color shall not be used except in intrinsically safe circuits. The sleeve shall cover from the cut insulation end to a point past where the conductor enters the plastic wire duct or a minimum of 4 inches. The second label shall identify the device and socket to which the opposite end of the cable is connected. wire tagging is not necessary. Exceptions: 1) Alternate wire tagging schemes.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 7. The second tag shall identify the terminal number to which the opposite end of the wire is connected. Commentary Notes: Where jumpers are installed between terminal blocks in the same row or column and are clearly visible. Where wires terminate on instrument or device terminals. 7. The first tag (closest to the end of the wire) shall identify the terminal number to which the wire is physically connected.11. Each cable tag shall have two labels. Identification shall be in accordance with designations shown on instrument loop diagrams (ILDs). whichever is less. which conform to established local practice. Sleeves shall not be used over green insulation. 7. the instrument tag number and terminal designation (+) or (-) (if applicable) will be used in lieu of terminal strip identification.11 Wire Tagging 7. The interconnecting wiring shall be tagged at each end with two identification tags (or the two may be combined into one tag with sufficient separation between wire numbers). may be used for extensions to existing facilities with the prior approval of the operating facility Manager. The two tags may be combined into one tag with sufficient separation between the two labels. the wire must be sleeved with the required color. The first label (closest to the plug connector) shall identify the device and socket to which the plug is to be connected.11.2 Page 15 of 21 . 11. Exceptions: 1) Alternate wire tagging schemes. Per NEC 310-11. Page 16 of 21 .11. Wraparound. slip-on sleeves. Spare pairs/triads in multi-pair/triad cables shall be labeled "SPARE" in addition to the destination and source terminal numbers.6 7. 7.11.7 Exception: If the wire insulation is not marked then a permanent placard must be attached to the inside cabinet door showing the above information and location of where the wiring is used. Process & Control Systems Department. All spares are to be terminated. (Upside down or covering of tag information by plastic duct covers is not acceptable). may be used for extensions to existing facilities with the prior approval of the operating facility Manager. The letter designators for type of wire or cable. The AWG size or circular mil area. 7. all conductors and cables shall be marked to indicate the following information: 1) 2) 3) 4) Maximum rated voltage for which the conductor was listed.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 2) 34-SAMSS-820 Instrument Control Cabinets – Indoor Vendor Standard wire tagging of interconnecting wiring is allowable provided concurrence is granted by the operating facility Manager and General Supervisor. 2) 7. heat shrinkable. Manufacture's name or trade mark. Where shrink fit cable markers cannot be installed over pre-made cable and connectors. Plastic sleeves that are specifically designed to fit on a specific wire gauge and come with pre-printed alpha/numeric inserts (such as Grafoplast Trasp System) may be used for wire tags with prior approval of the operating facility Manager.5 Wire and cable tags shall not be handwritten. a suitable tie-wrap or equivalent type permanent marker shall be used.11. Process Instrumentation Division. Wire tags shall be installed and oriented such that the tags are easily read. which conform to established local practice.11.3 Wire tag information shall be permanently marked in block alpha numerics or typed on tubular.4 7. snap-on or self-adhesive markers shall not be used. 12.g. The relay tag shall not be mounted directly on the relay and shall be visible when the relay is installed. Using relays that are permanently attached to the relay base is not acceptable. or equivalent. Exception: Relays provided as an integral part of manufactured electronic equipment installed within cabinets may use that manufacturer's standard offering. The cable tie shall have a maximum continuous use temperature rating of 85ºC or higher.2 Each relay shall be supplied with a bracket or holding clips to prevent it from falling off the base (socket).12. 7. Using multisocket modules that can accommodate more than one relay is not acceptable. In addition to 7. 11-pin (3PDT) or 8-pin (DPDT) plug-in type. Each row of ESD terminals shall additionally be marked to show ESD service. The relay number shall be shown as presented in the detailed cabinet drawings.3 7.12.4 7. (e. color black-white (relay number engraved into the black core with white surface. The mounting socket shall be provided with a plastic label..12 Terminal Coding 7.13.13. 7. Each vertical row and group of rows shall be labeled separately.g. +24 VDC.1. A dedicated relay base shall be provided for each relay..8 All cable ties used inside of cabinets shall be weather resistant nylon cable ties with a stainless steel barb.5 Page 17 of 21 .13.2 7. e. or 120 VAC.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 7.1 Each row of terminals shall be clearly identified with an alphanumeric label. dull finish). Panduit Dome-Top Barb Ty Cable Ties – Weather Resistant. dust-tight. etc. DIN rail mounted relay bases are preferred.11.13. from top to bottom or left to right).13 Relays 7. 7.13. 7.12. each row of Power supply and bus terminals shall be marked with voltage type and level.) Numerical terminal identification and coding shall be assigned sequentially (in ascending order.3 7.1 Relays shall be of the electromechanical. 3 Individual circuit breakers shall be provided for each power supply unit.15 Lamp Test Facilities For all control panels with indicating lights.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 7. 7.16. It shall be possible to access the lamp bulbs from the front for replacement.16 Circuit Breakers and Fuses 7. The color of the pushbuttons or lights shall be green for "ON"/"OPEN" and red for "OFF/"CLOSE" positions. Exceptions: LED or other lamps integral to a manufacturer's electronic instrumentation do not require the lamp test button. a lamp test button shall be provided per panel. All relays shall be provided with suppression diodes. 7.8 7. Only screw terminals shall be provided on push buttons. Pull-in voltage shall be 80% or less of nominal voltage.7 7.13.2 7. as the failure of one breaker requires complete replacement of the assembly. Tandem type (dual) circuit breakers in a single molded case shall not be used. Power status-indicating lights that are normally "on" where it is not desirable to "cross-feed" lamp test power from an alternative source (Such as UPS power status).13.16. Fuses and circuit breakers shall be readily accessible for maintenance with sufficient clearance from obstructions. Exception: Existing facilities that currently deviate from the above light color specification may use other conventions in order to keep the lighting philosophy consistent within the facility.6 7. Relay configuration and pertinent operating information shall be imprinted on the case.13. Long-life type lamps or LED cluster lamps shall be used. Push Buttons and Lights Push buttons and lights shall be industrial quality.1 7. Page 18 of 21 .14 Coil voltage shall be as specified in the Purchase Order.16. Push buttons shall have protective mechanisms to prevent accidental activation as required by the detailed design specification. as required. Acceptable methods of consolidating shields are as follows: a) b) c) d) Special grounding terminals in intimate contact with an electrically isolated DIN Rail.3 7. Article 250. continuous path to ground.3 are nominal. comb jumpers or bridges of any type.17.4 Circuit breakers shall be installed in a manner that allows replacement of a breaker without disruption to adjacent breakers. or fitted with screw-type compression lugs. Terminal Block jumper bars designed for the selected terminal blocks.1 Cable shields must have a single. Commentary Note: The ground bus dimensions in Paragraph 7. Grounding system recommendations and requirements provided by manufacturers of instrumentation and control systems (e. Buses that are slightly different in sizes are acceptable provided that they are 7.18.g. electrically isolated grounding bars shall be provided.17. Shields shall be consolidated and ultimately connected to the Instrument Circuit Ground Bar as detailed in paragraph 7. 7..18. Electrically isolated bus bars running parallel to terminal blocks. Separate.3 Page 19 of 21 .18. Cable shields must have a continuous path to ground. suitably drilled and tapped for screw terminals and wire lugs. 7.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 7.2 7.1 Both safety ground and instrumentation circuit ground must conform to NEC.2 7.18 Grounding 7. Circuit breakers shall not be interconnected using wire jumpers.18. All ground buses shall be made of a solid copper measuring the following nominal dimensions 5mm x 40 mm x (y length).16. Shield drain wires shall not be daisy-chained using bare wires or crimp connectors to the ground connection.17.18.6. Preformed jumper combs designed for the selected terminal blocks. Distributed Control Systems) shall be followed.17 Marshalling Cabinet Shielding 7. Ground loops and floating shields shall be avoided. 18. Fluorescent lamps shall have clear plastic sleeve guards to help contain broken glass in case of an accident. If specified.1 7.. A No.3 7. chassis GND connections.19.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor sized for the worst case ground currents.18.19. cabinet lights shall be 120 Volt. type E27 or ES (Edison Medium Screw Base) fitting or 15-watt minimum industrial grade. 60-watt incandescent lamps. This bus shall be directly bolted to the cabinet without the use of insulators. 10 amp as a minimum. AC power receptacle outlets shall be grounded using ground wire terminated on the receptacle grounding terminal. Incandescent lamps shall have a guard to help protect the lamp from accidental breakage.7 When provided.19 Lighting.4 Page 20 of 21 . Convenience and Power Distribution Receptacle Outlets 7. green or green with yellow tracer insulation. racks. convenience outlets shall be duplex-type and rated at 120 VAC. (e.19. 7. 2 AWG screw-type compression lug shall be provided on both end of each ground bar for interconnection with the Master Instrument Ground or Master Safety Ground. Interconnections between shield consolidation points and the bus bar shall be minimum 14 AWG copper wire.18. Individual wiring interconnections between the internal components and the bus shall be minimum 14 AWG copper wire.) 7. This bus bar shall be electrically insulated from the cabinet structure. 7. A receptacle utilizing the faceplate as a ground path is not permitted.g.4 7. size IEC. as specified in the Purchase Order.6 7.18. The ground bus bars shall be labeled and wired as follows: "AC SAFETY GROUND" for all exposed metal surfaces of cabinets. green or green with yellow tracer insulation. etc.19. When specified in the Purchase Order. "INSTRUMENT CIRCUIT GROUND" for connecting cable and wire shields and DC Common. fluorescent lighting fixture(s) oriented in such a manner that the majority of the interior portions of the cabinet are illuminated. 7.2 Cabinet lights shall be installed where practical and necessary.5 The preferred location of the ground bus bars is at the bottom of the cabinet. per the Saudi Aramco Inspection Requirements Form 175-343100 attached to the Purchase Order. 406. Tests shall include. independent of the UPS power supply. Visual inspection to verify compliance with requirements of this specification.470MHz. 5 October 2005 28 May 2007 Page 21 of 21 . The certificate(s) shall be for either the entire cabinet or for all the electronic equipment installed within the cabinet. Automatic door switches for lamps are allowed. 7. Revision Summary Major revision intended to address major comments generated as part of the Instrumentation Standards Value Engineering conducted on March 5-9. If certificates are not available.0 meter from the cabinet. with cabinet doors open. but shall not be limited to: a) b) c) d) A function test of all electronic instruments and electric control circuits and relays. Level 3. The Cabinet Fabricator shall verify the operation of all instrumentation and controls. Documented test procedures shall be submitted to Saudi Aramco for approval not less than thirty (30) days before commencement of test.19. Level 3. A switch in the cabinet (in addition to the circuit breaker) shall control each lamp where the lamp is installed.19. 50-174 MHz. with cabinet doors open.Document Responsibility: Instrumentation Issue Date: 28 May 2007 Next Planned Update: 1 November 2010 34-SAMSS-820 Instrument Control Cabinets – Indoor 7.6 8 Testing and Inspection The items manufactured to this specification are subject to verification by the Saudi Aramco Inspection representative. and 800-870 MHz and held at a distance of 1. 2005. Complete wiring check with verification that terminal and wiring code conforms to cabinet design drawings. (at a 10 V/m power level).5 Interior lamps and convenience outlets shall be wired to separate thermal/magnetic circuit breakers which shall be powered from a Saudi Aramco-furnished AC distribution panel. Minor revision. A certificate of compliance to the RFI requirements of IEC 61000-4-3. EMI/RFI Interference (Radiated Susceptibility) The cabinet electronic equipment shall perform within the normal limits without loss of function or degradation of performance when subjected to radiated electromagnetic fields in accordance with IEC 61000-4-3. the equipment in the cabinet shall function within the normal limit when tested with a 5 watt radio transceivers operating at 5 Watts within the frequency ranges.
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