Class 1 circuits shall not be run in the same cable with communications circuits. So, the standard now specifies continuously sweeping maximum VSWR and attenuation from 50 MHz to 11 GHz with VSWR remaining at or below 1.15:1 at 100 MHz and 1.33:1 at 11 GHz. That conflict has been removed in the 2020 Code. Painting or coating of plenum cables might compromise their fire-safety properties. The International Standards Organization (ISO) and International Electrochemical Committee (IEC) collectively work toward establishing standards for cabling. RepresentativesBlulen, CISCO Systems, Comtest Laboratories, Department of Defence, Foxtel, Free TV Australia, IBM, Market Access, nbn, Optus, Telstra, TPG Telecom, Trillium Technology, Vocus, VTI Services. At CommScope we push the boundaries of communications technology to create the worlds most advanced networks. MIL-DTL-17 is the primary standard designers refer to when designing or specifying cables for military and aerospace applications. Standards Catalogue. That is, while standards are essential, it was inevitable that they would grow like weeds until they became so unmanageable that it turned into enormous burden to anyone who had the temerity to use them. They allow the management of cables and the types of connectors allocated to various systems. S '!G)QD \, t@E@m*La}D{#MCpI IfS]>,oq0@Xzi_$KpK`WEpY?Kv[ 6'$hm`--0kFMU4|N9m+>$4=R~QUF{O>(7pq10F S #. Q?+*{(dzz\ t? S*$#|a jWT8r'@lH!Pa ?l-(9/AaT;6(p/l%Bbd4BQ,W;ki"H#hk2'70\u{'>W6!YW-"$P[.CFCGiByR. 4190 0 obj <>/Encrypt 4172 0 R/Filter/FlateDecode/ID[<7F9B1846C7D73ED6D83773510E3174B0><54F53406E92C39458E9337FDC4B282E1>]/Index[4171 48]/Info 4170 0 R/Length 98/Prev 994180/Root 4173 0 R/Size 4219/Type/XRef/W[1 3 1]>>stream Control: ISM-1822; Revision: 0; Updated: Mar-23; Applicability: All; Essential Eight: N/AWall outlet boxes for individual systems use a consistent colour. DMS supports two classes of messages: organizational messages (formal record messages) and individual messages (informal E-mail). endstream endobj 171 0 obj <> endobj 172 0 obj <> endobj 173 0 obj <>stream Recognizing 60 volt DC circuits is a step in the right direction but still inadequate because it does not encompass all Class 2, Class 3 circuits permitted in Tables 11(A), 11(B) in Chapter 9, and all power-limited fire alarm circuits permitted by Tables 12(A) and 12(B) in Chapter 9. Control: ISM-0217; Revision: 5; Updated: Mar-23; Applicability: TS; Essential Eight: N/AWhere spatial constraints demand non-TOP SECRET patch panels be installed in the same cabinet as a TOP SECRET patch panel: Control: ISM-1116; Revision: 4; Updated: Mar-23; Applicability: TS; Essential Eight: N/AA visible gap exists between TOP SECRET cabinets and non-TOP SECRET cabinets. hbbd```b``OoM0"H e#d"[`q1"Al{#}P %3| _u This is especially true of plenum cables, which are designed to have excellent fire-resistance properties. Accomplishing that wont be simple, however, because although 0.8-mm connectors are currently in production for test-and-measurement platforms, research is underway concerning 0.6-mm and even 0.4-mm connectors designed to serve systems operating at hundreds of gigahertz. .DxO%xyx #s$B)"45~cp)Zc@ 0 ?xxAomJgE.i /^ The Institute of Electrical and Electronics Engineers (IEEE) is a global organization that seeks to advance innovation and technological excellence. Rather, they are agreements that equipment vendors assume when developing form factors for communications interface. TasNetworks Standard Communications and Data Cabling Standard R0001043989 Version 2.0, June 2018. Control: ISM-1114; Revision: 4; Updated: Mar-23; Applicability: All; Essential Eight: N/ACable bundles or conduits sharing a common cable reticulation system have a dividing partition or visible gap between each cable bundle and conduit. Provide flexibility, scalability and functionality as you expand your networks and roll out new technologies. HbNQ! Build a converged, AI-enabled enterprise wired and wireless network and manage it from any cloud or appliance. x5:]o?"L`:mEk|aa_^drROb4NV32A&M%4;9/[p:)ankYz}va+G"n(bvW-WpsSdn4WMQ.M^}/Lj._vEiKt\:yk[]lo=v*hXUi 3g7$ bU7&er@},aqnC{M^uakO 1a)>i PZ_?Q*x(7"$*b$ EDp6\m"A]@E VpIh /%T>W Control: ISM-1101; Revision: 3; Updated: Dec-21; Applicability: All; Essential Eight: N/AIn TOP SECRET areas, cable reticulation systems leading into cabinets in server rooms or communications rooms are terminated as close as possible to the cabinet. Although this standard is designated for coaxial cables used in airborne platforms, it can also be an alternative to MIL-DTL-17, especially for higher frequencies. Defence Communications Cabling Standard (1 products available) 1/6. The InterNational Committee for Information Technology Standards (INCITS) develops standards governing the security, storage, transfer and management of information. 7964 0 obj <>/Filter/FlateDecode/ID[<19CA5B9FD300BC40A3823C87A480C8C7>]/Index[7949 38]/Info 7948 0 R/Length 81/Prev 484016/Root 7950 0 R/Size 7987/Type/XRef/W[1 2 1]>>stream Optical fiber cables, Type OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN and OFC, Communications cables, Types CMP, CMR, CMG and CM, Coaxial cable TV cables, Types CATVP, CATVR and CATV, Class 2 cables, Types CL2P, CL2R and CL2, Class 3 cables, Types CL3P, CL3R and CL3, Power-limited fire alarm cables, Types FPLP, FPLR and FPL. 2 w Led by the United States and France in the late 18th and 19th Centuries, countries began to realize the benefits of having standards that defined the components, subsystems and systems used in their military equipment. Labels for TOP SECRET conduits should be of sufficient size and colour to allow for easy identification. Not surprisingly, these standards proliferated over the years, and by 1990, the DoD assessed that they numbered about 30,000, covering such obscure topics as specifications for the rubber used on swim fins. In addition to common controls, this section provides additional controls for shared facilities, such as a single floor, or part of a floor, within a multi-tenanted building. provides project management and installation of all types of structured cabling for voice, data, video and wireless, LANs & WANs. 2oWf [Content_Types].xml ( j0EJ(eh4NDB81$14 {1l w%=^i7+-d&0A6l4L60#S Control: ISM-1115; Revision: 4; Updated: Dec-19; Applicability: All; Essential Eight: N/ACables from cable trays to wall outlet boxes are run in flexible or plastic conduit. The defence Estate Quality Management System (http://www.defence.gov.au/im/) contains further requirements including the principles of development, zone planning, site selection, engineering requirements and environmental impact assessment and approval requirements. Listing requirements for other than plenum, riser, general-purpose and limited-use cables, such as undercarpet cables, communications wires and drop wire were not moved. The way end users make purchasing decisions is altered by n, The first ride of the team @thoemusmaxon on Brazilian soil to get used to the climate. These new marking requirements facilitate matching the ampacities of the cables with the output current of the power supply. For example, while SECRET and TOP SECRET cables have designated cable colours, cables for other systems may be any colour except for those reserved for SECRET and TOP SECRET systems. The most important and most obvious change is that Chapter 8 has a new general article. MIL-DTL-17 is the primary standard designers refer to when designing or specifying cables for military and aerospace applications. In the 2020 NEC, the new Section 725.3(P) for Class 2 and Class 3 cables, and new Section 760.3(O) for power-limited fire alarm cables, permit green wires to be used ungrounded without the voltage limitations in Section 250.119. March 30th Webinar: How Fiber Infrastructure Optimizes Delivery of Smart Municipal Services. }=2g)#`$]bf9}FLF7j3B)/nYgR+v3A_w@'@B@ %::5::0rRP0INy+j>j&orLb? (1) Classified as Communications Circuits. TELECOMMUNICATIONS CABLING STANDARD General Requirements ANSI/TIA/EIA-568-B.2 100 OHM TWISTED PAIR CABLING STANDARDS Backbone Connecting Hardware Cords and Jumpers Horizontal Stranded ANSI/TIA/EIA-568-B.3 OPTICAL FIBER STANDARDS Optical Fiber Cabling Components Addendums ANSI/TIA/EIA-568-B.1-1 Patch Cord Bend Radius a=, &. Definitions of terms used in multiple articles in Chapter 8 have been moved to the new general article (Article 800). Its a performance rather than a detail specification, so it gives cable manufacturers more flexibility in how they meet its requirements. When completed, its hoped that the result will serve as a useful guide for the selection and use of RF/microwave connectors and cables. Control: ISM-0187; Revision: 8; Updated: Mar-23; Applicability: S; Essential Eight: N/ASECRET cables, when bundled together or run in conduit, are run exclusively in their own individual cable bundle or conduit. %PDF-1.6 % hbbd``b`U@(`a-0`*AHk3 z k:0 -HN7,Ad R ? Rapidly scale fiber capacity for your enterprise, MTDC, service provider or hyperscale data center. Many of the installation requirements for data/comm cables have been consolidated to new Article 800, including the following. Control: ISM-1095; Revision: 5; Updated: Dec-21; Applicability: All; Essential Eight: N/AWall outlet boxes denote the systems, cable identifiers and wall outlet box identifier. Developing, implementing, maintaining and regularly verifying cable registers assists installers and inspectors, with the help of floor plan diagrams, to trace cables for malicious or accidental changes or damage. These notes state, respectively, Paint, plaster, cleaners, abrasives, corrosive residues, or other contaminants may result in an undetermined alteration of Class 1, Class 2, Class 3 and PLTC cable properties, and, Paint, plaster, cleaners, abrasives, corrosive residues, or other contaminants may result in an undetermined alteration of PLFA and NPLFA cable properties.. In the 2020 NEC, the 50 volt exception in 250.119 has been changed to be 50 volts AC or 60 volts DC in order to accommodate PoE. Cablers must now comply with the 2020 Wiring Rules. Meet technical and functional requirements while taking care of aesthetics at the front of your copper and fiber networks. [c`+g`4uO{qc9e2Nd Xg R lS8yvESZX!j~ f /Icon Do ,/l56&+m[NOrN~%+Bs=Yz+6?nDF4;9:MR-:(AQ 9 WLeG Fb0+4 %$yn7uCZOSg-a1af8KP``.E]s Control: ISM-1821; Revision: 0; Updated: Mar-23; Applicability: TS; Essential Eight: N/ATOP SECRET cables, when bundled together or run in conduit, are run exclusively in their own individual cable bundle or conduit. Join our dynamic team of talented innovators as we redefine connectivity across the globe. 4218 0 obj <>stream Control: ISM-1100; Revision: 1; Updated: Sep-18; Applicability: TS; Essential Eight: N/ATOP SECRET cables are terminated in an individual TOP SECRET cabinet. What this means in practice is that few designers have the time (or interest) in deciphering all of these documents. Control: ISM-0213; Revision: 4; Updated: Mar-23; Applicability: S, TS; Essential Eight: N/ASECRET and TOP SECRET cables are terminated on their own individual patch panels. Not surprisingly, there are even standards defining how standards must be formatted and how their content must be presented. The National Electrical Code (NEC) is published by the National Fire Protection Association (NFPA) with the revisions on a three-year schedule. Control: ISM-1102; Revision: 3; Updated: Dec-21; Applicability: All; Essential Eight: N/ACable reticulation systems leading into cabinets are terminated as close as possible to the cabinet. Moreover, the primary cable and connector standards themselves are divided into various categories, including testing materials, qualification, conformance testing and inspection, and electromagnetic compatibility (which has its own set of standards). Read about technologies, trends and strategies that will define your network and shape our digital world in the years ahead. It is important to consider emanation security threats as early as possible in a systems life cycle as costs will be much greater if changes have to be made once a system has been designed and deployed. As this Standard is reproduced from an international standard, the following applies: (a) Its number appears on the cover and title page while the international . This article appeared in Microwaves & RF and has been published here with permission. Further information on audio secure rooms can be found in the Attorney-Generals Departments Protective Security Policy Framework, Physical security for entity resources policy. Finally, semi-rigid or rigid cables never bend once theyre formed when manufactured. Examples of appropriate cable bands include stick-on coloured labels, colour heat shrink, coloured ferrules or short lengths of banded conduit. In short, its always a gamble. However, an inner wall can be used to run TOP SECRET cables where sufficient space exists for their inspection. Issue 37 - Q4 2022Issue 36 - Q3 2022Issue 35 - Q2 2022Issue 34 - Q1 2022, Issue 33 - Q4 2021Issue 32 - Q3 2021Issue 31 - Q2 2021Issue 30 - Q1 2021, Issue 29 - Q4 2020Issue 28 - Q3 2020Issue 27 - Q2 2020Issue 26 - Q1 2020. (1) Communications Cables. Structured Cabling System . Communications and Cabling Standards - University of Sydney Utilize tools and accessories that make indoor and outdoor installations and maintenance quick and easy. The 2020 NEC, which replaces the 2017 NEC, was issued by the NFPA in August, 2019. a. Unclassified WLAN systems must be standards-based and IEEE 802.11 compliant in accordance with Paragraph 3.1.a. The applications of data/comm cables and their associated equipment are in 13 articles that are the responsibility of three code-making panels. The key is how to decipher them. Further information on the ACSCs Emanation Security Program, including a list of certified emanation security providers, is available from the ACSC. Labelling cables with the correct source and destination details minimises the likelihood of cross-patching and aids in fault finding and configuration management. Delight your subscribers with high-performance, easy-to-use broadband, video and home networking devices for the home. CCCA makes no warranty regarding the accuracy of the information provided in this paper, and expressly disclaims any implied warranties and any liability for use of the paper or reliance on views expressed in it. PK ! 800.27 Temperature Limitation of Wires and CablesNote that the requirement in Section 800.27 is simplified. In cases where a wall outbox contains cables for different systems, each connector should be individually labelled. This standard was formerly known as MIL-C-17, since it was developed in the 1940s and was revised many times over the years to better define the mechanical and electrical requirements for military coaxial cables. Sections 725.179(K) and 805.179(G) state that, Cables shall be permitted to be surface marked to indicate special characteristics of the cable materials. Information notes provide examples of optional markings. . Since the earliest days of RF and microwave connectors, the challenge for those defining them has been to provide the highest possible performance using the most advanced fabrication technology available at the time. a data center. This Standard applies to cabling products (including cable and related customer equipment) intended for connection to the customer side of the boundary of a telecommunications network. Report a cyber security incident for critical infrastructure, Report a cybercrime or cyber security incident, Australian cabling standards and regulations, Security Equipment Evaluated Products List, Guidelines for Communications Infrastructure (March 2023), Guidelines for Communications Infrastructure, security control and surveillance systems. Ensure superior protection, reliability and scalability for your indoor and outdoor networks. In addition, wall outlet box colours for other systems, such as OFFICIAL and PROTECTED systems, may use the same colour, such as blue. Change Prior to the 2017 edition, NFPA 75 always required active fire protection, typically sprinklers or a gaseous clean agent, in the raised floor plenum under the data center. 2). hbbd``b`Z D|)1@}H6D ) Hlc`bRHko 5 In fact, DoDs federal acquisitions policy document notes that if a company can demonstrate to the satisfaction of the contracting officer that its product meets QPL standards before the date specified for the award of a contract, it cant be denied the opportunity to submit a proposal solely because the companys product isnt on the QPL. The NEC has always permitted marking on communications cables to indicate additional attributes beyond those required by the Code, for example, a LAN cable marked CAT 6A. The 2017 edition of NFPA 75 permits two alternate approaches to fire protection in the raised floor plenum: either provide active fire protection or only use plenum grade materials, which include, of course, plenum cable. Control: ISM-0194; Revision: 3; Updated: Dec-21; Applicability: TS; Essential Eight: N/AIn shared facilities, a visible smear of conduit glue is used to seal all plastic conduit joints and TOP SECRET conduits connected by threaded lock nuts. Originally developed for military use, defence-standard (Def-Stan) cables are now widely used commercially. Whether youre an expert industry veteran or a new professional, your work will make an impact. Defence Audio Visual Environment (DAVE) standard Patterns are available and strongly encouraged for AV functional and passive ICT design. 3). Sections 725.139(D)(1) and 805.133(A)(b) in 2020 NEC deleted the requirements that the Class 2 or Class 3 circuits be classified as communications circuits. Corning will explain the key considerations municipal network operators should keep in mind as they plan to upgrade their critical infrastructure, as well as best practices for State of California gears up for L.A. to Phoenix middle-mile fiber network deployment. MIL-DTL-17. The cables shall be listed as communications cables.. In the 2017 NEC, Section 840.160 permits communications cables to carry circuits for powering communications equipment in addition to the communications signal, provided that the power supplied doesnt exceed 60 watts. 190 0 obj <>/Filter/FlateDecode/ID[<67460E567C4E2643BAC2C255874CA958>]/Index[170 34]/Info 169 0 R/Length 95/Prev 165117/Root 171 0 R/Size 204/Type/XRef/W[1 2 1]>>stream Defense Communications System synonyms, Defense Communications System pronunciation, Defense Communications System translation, English dictionary definition of Defense Communications System. Communications cables, Types CMP, CMR, CMG and CM Coaxial cable TV cables, Types CATVP, CATVR and CATV Class 2 cables, Types CL2P, CL2R and CL2 Class 3 cables, Types CL3P, CL3R and CL3 Power-limited fire alarm cables, Types FPLP, FPLR and FPL http://www.facebook.com/pages/Cabling-Installation-and-Maintenance/298118662118. Control: ISM-1123; Revision: 3; Updated: Dec-21; Applicability: TS; Essential Eight: N/AA power distribution board with a feed from an Uninterruptible Power Supply is used to power all TOP SECRET ICT equipment. It is important that TOP SECRET systems have control over the power system to prevent denial of service by deliberate or accidental means. Nor was there any requirement for adhesion of the dielectric core to the center conductor, with the result that it was possible to pull the center conductor out of the assembly when stripping it. Definitions used in multiple articles (other than just Chapter 8) have been moved to the definitions section in Chapter 1. In the spirit of reconciliation the Australian Building Codes Board acknowledges the Traditional Custodians of country throughout Australia and their connections to land, sea and community. Among the changes from the 2017 edition, a new general article in Chapter 8 consolidates redundant requirements. The listing requirements for Limited Power (LP) Cables are in Section 725.179(I) in the 2017 NEC. The standard goes even further, classifying connectors for six different types: In its latest versions, MIL-PRF-39012 added new qualification testing and approval requirements present in MIL-STD-790 (Established Reliability and High-Reliability Products) and made changes that increase the scope of the standard. Article 645, Information Technology Equipment, covers the installation of information technology equipment in an information technology equipment room, i.e. Listing requirements for cable routing assemblies and communications raceways have been moved from Article 805 to the new general article (Article 800) because the applications of cable routing assemblies and communications raceways are in multiple articles and chapters. There are new marking requirements in Section 725.121(C) of the 2020 NEC for power supplies that are used to supply power to cables that simultaneously transmit power and signal/communicate. The power sources for limited power circuits in 725.121(A)(3), limited power circuits for listed audio/video equipment, listed information technology equipment, listed communications equipment, and listed industrial equipment in 725.121(A)(4) shall have a label indicating the maximum voltage and rated current output per conductor for each connection point on the power source. Control: ISM-0201; Revision: 3; Updated: Mar-21; Applicability: TS; Essential Eight: N/ALabels for TOP SECRET conduits are a minimum size of 2.5 cm x 1 cm, attached at five-metre intervals and marked as TS RUN. Before they were added, attenuation requirements were only specified at three frequencies, which resulted in inaccurate measurements at other frequencies. Defence Standard Cable. ct-001. When cable reticulation systems are used for more than one cable bundle or conduit, it is important that there is a dividing partition or visible gap between cable bundles and conduits to facilitate easier cable inspection. Control: ISM-1720; Revision: 0; Updated: Dec-21; Applicability: S; Essential Eight: N/ASECRET wall outlet boxes are coloured salmon pink. Multi-source agreements (MSAs) are not official standards organizations. Control: ISM-1133; Revision: 3; Updated: Dec-21; Applicability: TS; Essential Eight: N/AIn shared facilities, TOP SECRET cables are not run in party walls. This paper, provided by the Communications Cable and Connectivity Association, is offered for general information and educational purposes. 7986 0 obj <>stream While all ICT equipment may not need certification to emanation security standards, it still needs to meet applicable industry and government standards relating to electromagnetic interference/electromagnetic compatibility. Control: ISM-0195; Revision: 7; Updated: Jun-22; Applicability: TS; Essential Eight: N/AIn shared facilities, uniquely identifiable SCEC-approved tamper-evident seals are used to seal all removable covers on TOP SECRET cable reticulation systems. The paper does not set forth the views of any member or any other party, nor may it be taken as such. Optimize and extend the life of your broadband copper network. Listing requirements for plenum, riser, general-purpose and limited-use, communications, cable TV and network-powered broadband communications cables have been removed from Article 805 (formerly Article 800), Article 820, and Article 830 and placed in the new Article 800 in order to reduce the redundancy in cable listing requirements in Chapter 8. Standards for cables and connectors have served the defense industry well for many years and theres every reason to believe they will continue to do so. CHAPTER 28 . This rating relates to the complexity of the advice and information provided on the page. To avoid confusion, it is important that, regardless of the type of cabling involved, a consistent cable colour is used. As Australian Standards require some structured cabling systems to use specified colours, such as red for fire control systems, it is important that all building management cables are appropriately labelled. Voice/data Cabling Services - Brea, California Fintech Communications' professional IT consultants take care of your VOIP consultants needs. Control: ISM-1119; Revision: 2; Updated: Dec-21; Applicability: All; Essential Eight: N/ACables in TOP SECRET areas are fully inspectable for their entire length. hVmo8+b$%tt.C The debate continues over how effective COTS has been in bridging the gap between commercial and military products, simplifying the process for contractors, and reducing costs. ^Wz/iOs=VLPDI(De|s=O>}2L*< x^h=up)6`R6G?^I !lBkZ\}r|f9;Py2+ In such cases, an organisation should band such cables with the appropriate colour and ensure that the cable bands are easily visible at inspection points. Defence Standard cables are now widely used in a variety of applications in heavy industrial environments, avionic control systems, computer and data . For 50- cables, the most important changes were the addition of swept-frequency measurements for attenuation and return-loss requirements (voltage standing-wave ratio or VSWR). 4171 0 obj <> endobj Owing to the increasing outrage from military contractors and the sheer impossibility of maintaining them, Defense Secretary William J. Perry wrote in 1994 what has become known as the Perry memo. The memo effectively prohibited the use of most standards without a waiver and directed contractors to use suitable commercial off-the-shelf (COTS) products whenever possible in their place. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ Types of Wire or Cable in the Military/Defense Industry. 0 update the requirements to reflect the requirements in the AS/CA S009:2020 customer cabling installation Standard, to ensure alignment between the two Standards. Millimeter-wave frequencies take this to an entirely new level because the required coaxial connectors are incredibly tiny and fragile. |1!S=Rld88`UG S tyc|q:1]C;?q>h}/J#h(4S0*Eny#'+/cq3 [{82 s/yB( x}]G]V0U%!l11noT=r3:a.!34xL 2kV(~LrxL"7WovHIQN\{L #iMwuC&(HQSwokOU{MzKRY )N7:*i"rj/lpa&[FD d59!"IEx~OBiCVI/8[7uyee G!B0d'/,$f&P ixR1h}y7'&o)8|;h00|sAHOoH4b{\!";?78uD~vA] &GG_7cq"[W;}GLF~:b =z[@O W5~{";#(/t [xURd,RwCCR, New cabling standard, TIA-568.2-D, recognizes 28-AWG patch cords June 25, 2018 The ANSI/TIA-568.2-D standard requires de-rating of the 100-meter channel length when 28-AWG patch cords are used. %PDF-1.6 % This section is only applicable to facilities located within Australia. This article, contributed on behalf of the Communications Cable and Connectivity Association (CCCA), is intended to provide the reader with a guide to the key changes in the 2020 National Electrical Code that are of interest to manufacturers, installers, distributors and users of data/comm cables. It details specifications for flexible and semi-rigid . Since the 1960s, the IEEEs P287 Standard for Precision Coaxial Connectors (DC-110 GHz) has been focused on the goal of creating standards for these components, and their efforts, along with those of the microwave and test-and-measurement industry, have delivered impressive results. f?3-]T2j),l0/%b Having clear covers face inwards increases their inspectability. 7949 0 obj <> endobj In such scenarios, TOP SECRET cables should be encased in conduit with all gaps between the TOP SECRET conduit and the wall filled with an appropriate sealing compound.

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