Attachment_J4_-_DISN_Implementation_Standards_-_30_Jan_13.pdf

DEFENSE INFORMATION SYSTEMS AGENCY

NETWORK SERVICES

DISN IMPLEMENTATION STANDARDS

30 January 2013

Defense Information Systems Agency DISN Network Services (NS)

P.O. Box 549 Fort Meade, MD 20755-0549

FOR OFFICIAL USE ONLY

FOR OFFICIAL USE ONLY Page 2

SUMMARY OF CHANGES

1. Foreword Section 4.3.2 MIL-HDBK-232A, RED/BLACK Engineering Installation Guidelines 20 Mar 1987 replaced

MIL-HDBK-217F.

2. Foreword Section 4.3.3 MIL-STD-1678-4, Fiber Optic Cabling Systems, 20 May 2010 replaced MIL-HDBK-282

3. Foreword Section 4.3.15 MIL-STD 100G, 9 June 1997 replaced

MIL-STD 100G, 9 SEP 1976

4. Chapter 1 Section 1.1.1 added clarification: QA inspection shall be conducted to ensure 90% compliance but must ensure no hazerdous conditions exisit. QA may be accomplished by the lead FE or independent team as deemed appropriate by the installation vendor.

5. Chapter 1 Section 1.2.1 added clarification: A detailed Telecommunications Services Implementation Plan (TSIP), with cautionary instructions for the field engineers, will suffice if the level of detail is sufficient to accomplish the assigned tasks.

6. Chapter 1 Section 1.2.7 removed: The exposed ends of dead cables or wire remaining shall be insulated with two layers of electrical tape or a heat shrink cap.

7. Chapter 1 Table C1.3.1 added: Cesium tubes, PolyVinyl Chloride-PVC and cabling, Brominated Flame-retardants, printed circuit boards, cabling, and connectors

8. Chapter 2 Section 2.4.1 added clarification: All 2-post equipment racks 7'-0" and taller shall be top supported by attachment to the site infrastructure, if existing site conditions allow.

9. Chapter 2 Section 2.4.10 added clarification: Where ever possible, 2 & 4-post Racks, cabinets, etc. shall be bolted to the true floor using approved floor anchors, stanchions, etc.

10. Chapter 2 section 2.4.16 added clarification: All 2 & 4-post racks and cabinets shall be individually grounded to the equipment ground plane or ground bus. Racks and cabinets shall never be “daisy chained” to each other. All exceptions to this policy shall be addressed through the Release and Deployment Lead on a case by case basis

11. Chapter 2 section 2.5.11 added clarification: Insulation or heat shrink tubing must be placed on exposed threaded rods used to support frames, racks, etc... that may come into contact with wires or cables to protect the wires or cables from damage.

12. Chapter 2 Section 2.6.31 added clarification: Red and black fiber can share the same distribution vehicle as

FOR OFFICIAL USE ONLY Page 3 long as both red and black data is not contained within the same multifiber cable. However, in TEMPEST facilities, Fiber carrying secure (RED) communication is to be encased in a metallic conduit or ducting and separated from BLACK communication by Protective Distribution Systems IAW NSTISSAM TEMPEST/2-95, RED/BLACK Installation Guidance.

Red and black signal wires, optical fibers, power cables, processors and equipment shall be separated IAW NTISSAM 2- 95, TEMPEST RED/BLACK installation Guidance, 12 Dec 1995, and amendments.

13. Chapter 2 Section 2.7.39 deleted duplication of 2.7.36

14. Chapter 2 Section 2.7.41 renumbered as 2.7.40 and added clarification: Equipment cabinets are designed and configured, and their rack-mounted equipment is positioned to provide sufficient thermal cooling, natural air convection or forced air convection from internal fans to ensure the proper operation of the rack’s electronic equipment in accordance with the specifications, installation and maintenance manuals of the electronic equipment. With the room’s ambient temperature between 70 and 80 degrees Fahrenheit, operate all the rack’s electrical and electronic equipment at full capacity for at least four hours. Then request network operations telnet into the devices to ensure equipment temperature is within a safe operating range before departing site.

15. Chapter 3 Section 3.2.12 added clarification to use fire stopping at sites following fire stopping practices:

Membrane penetration for cables, cable trays, conduits, pipes, tubes, wires and similar items to accommodate electrical, mechanical and communication systems that pass through a membrane of a floor or wall or floor/ceiling assembly constructed as a fire barrier shall be protected by a fire stop system at sites where fire stopping practices are currently followed.

16. Chapter 3 Section 3.3.1 added clarification plenum rules followed only in plenum airspaces: Insulation of power cables installed in the ceiling plenum or below the raised floor must meet the requirements of NFPA-70.

Communication cables installed in ceiling spaces and under raised floors shall be plenum rated or installed in a metallic conduit if installed in a plenum air space.

17. Chapter 4 Section 4.4.1 corrected cable specifications:

The maximum distance for unbroken Category 5 and Category 6 cables carrying Ethernet digital signals is 100 meters, unless otherwise specified in the BESEP, TSIP or EIP.

18. Chapter 4 Section 4.1.17

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19. Chapter 4 Section 4.1.29 MDF clarification added: All cables are to enter intermediate and main distribution frames on the vertical side.

BASIC INSTALLATION REQUIREMENTS

1. Purpose. This document outlines the general workmanship requirements for the installation of telecommunications and associated equipment by the Defense Information System Agency (DISA) or personnel to do installations on behalf of DISA. The intent of this document is to improve the quality of installation and workmanship practices, eliminating degradations to DISN telecommunications. It also prescribes procedures to maintain overall systems availability, ensure compatibility between electrical/electronic systems, and local ambient atmospheric and electromagnetic environments. Assuring human safety and welfare practices as they relate to workmanship and installation is also within the purview of this document.

2. Applicability. These are the minimum installation standards applicable to all installations of DISN electrical or electronic equipment, systems, and subsystems. The guidelines herein complement other specified technical standards and requirements that are necessary for the installation of the equipment, system or subsystem. Substandard installation practices can directly contribute to degraded equipment operations, electromagnetic interference (EMI) problems, Transient Electromagnetic Pulse Emanations Standard (TEMPEST) violations, poor power quality, grounding problems, and safety hazards at DISA DISN sites.

2.1 If conditions arise that, require deviation from the

requirements described herein, a signed mutual agreement shall resolve differences between DISA NS6 and the installation team.

2.2 DISA reserves the right to revise this document for any

reason, including but not limited to, conformity with standards declared by various agencies, utilization of advances in the state of technology, or integration of new products. This document provides a list of known specifications and standards whose use by Department of Defense (DoD) program offices, buying activities, and contractors and is mandated by Public Law or Government regulation.

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3. Authority. This document is in accordance with the authority contained in Department of Defense Directive (DoDD) 5105.19.

4. References.

4.1 The following specifications, standards, and handbooks form a part of this document to the extent specified herein. For this document, a specification or standard is defined as any document developed or adopted under the Defense Standardization Program as described in DoD 4120.24-M, "Defense Standardization Program Policies and Procedures," and includes non-Government standards, defense specifications and standards, federal specifications and standards, commercial item descriptions, data item descriptions, and international standardization agreements.

4.2 CODE OF FEDERAL REGULATIONS (CFR)

4.2.1 29 CFR 1910, Occupational Safety and Health Standards(Fed/OSHA), 27 Jun 1974

4.3 DEPARTMENT OF DEFENSE (DOD)

4.3.1 DoD 5200.8-R, Physical Security, 7 May 2007

4.3.2 MIL-HDBK-232A, RED/BLACK Engineering Installation

Guidelines, 20 Mar 1987

4.3.3 MIL-STD-1678-4, Fiber Optic Cabling Systems, 20 May 2010

4.3.4 MIL-HDBK-411B Power and the Environment for Sensitive DoD Electronic Equipment, 15 May 1990

4.3.5 MIL-HDBK-419A Vol I and II, Grounding Bonding, and

Shielding for Electronic Equipment and Facilities, 19 Dec 1987

4.3.6 MIL-HDBK-420, Notice 1, Site Survey Handbook for

Communications Facilities, 24 Oct 2000

4.3.7 MIL-HDBK-454B, General Guidelines for Electronic

Equipment, 15 Apr 2007

4.3.8 MIL-HDBK-729, Corrosion and Corrosion Prevention Metals, 29 Nov 1983

4.3.9 MIL-HDBK-1004/4, Military Handbook Electrical Utilization Systems, 31 Jan 1990

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4.3.10 MIL-HDBK-1008C, Military Handbook Fire Protection for

Facilities Engineering, Design, and Construction, 10 Jun 1997

4.3.11 MIL-HDBK-1012/13 Telecommunication Premises Planning, Design and Estimating, 31 May 1996

4.3.12 MIL-HDBK-1013/1, Design Guidelines for Physical Security of Fixed Land-Based Facilities, 31 Jun 1988

4.3.13 MIL-HDBK-2000, Notice 1, Military Handbook Soldering of Electrical and Electronic Assemblies, 6 Sep 1995

4.3.14 MIL-HDBK-2051, Military Handbook, Fiber Optic Cable

Topology Guide, 22 May 1996

4.3.15 MIL-STD 100G, Standard Practice for Engineering Drawings, 9 June 1997

4.3.16 MIL-STD-108E, Definitions of and basic Requirements For Enclosures For Electric and Electronic Equipment, 19 SEP 1985

4.3.17 MIL-STD-130L, Identification Marking of U.S. Military

Property, 10 Oct 2005

4.3.18 MIL-STD-188-124B, Notice 3 Grounding, Bonding and

Shielding for Common Long Haul/Tactical Communication Systems Including Ground-Base Communication Electronic Facilities and Equipment, 18 Dec 2000

4.3.19 MIL-STD-188-154A, Subsytem, Equipment and Interface

Standards For Common Long Haul and Tactical Telecommunications Control Facilities, 31 Dec 1997

4.3.20 MIL-STD-348A, Department of Defense Interface Standard, Radio Frequency Connector Interface, 20 Apr 1988

4.3.21 MIL-STD-681D, Notice 1, Military Standard Identification Coding and Application of Hookup and Lead Wire, 19 Jun 2000

4.3.22 MIL-STD-889B, Notice 3, Military Standard Dissimilar

Metals, 17 May 1993

4.3.23 MIL-STD-1276G Department of Defense Interface Standard Leads for Electronic Component Parts, 14 Mar 2007

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4.3.24 MIL-STD-1285D, Department of Defense Standard Practices, Marking of Electrical and Electronic Parts, 7 Sep 2004

4.3.25 MIL-STD-1568, Material and Processes for Corrosion

Prevention and Control in Aerospace Weapons Systems, 18 Feb 1997

4.3.26 MIL-STD-2042 1, Fiber Optic Cable Topology Installation Standard Methods, CABLES, 25 Jul 2002

4.3.27 MIL-STD-2042B-2, Fiber Optic Cable Topology Installation Standard Methods, Equipment, 25 Jul 2002

4.3.28 MIL-STD-2042B-3, Fiber Optic Cable Topology Installation Standard Methods, CABLE PENETRATIONS, 25 Jul 2002

4.3.29 MIL-STD-2042B-4, Fiber Optic Cable Topology Installation Standard Methods, CABLEWAYS, 25 Jul 2002

4.3.30 MIL-STD-2042B-5, Fiber Optic Cable Topology Installation Standard Methods, Connectors and Terminations, 25 Jul 2002

4.3.31 MIL-STD-2042B-6, Fiber Optic Cable Topology Installation Standard Methods, TESTS, 25 Jul 2002

4.3.32 TM 5-683, NAVFAC MO-116, AFJMAN 32-1083 Facilities

Engineering Electrical Interior Facilities, 15 Dec 1995

4.3.33 TM-684, NAVFAC MO-200, AFJMAN 32-1082 Facilities

Engineering Electrical Exterior Facilities, 29 Nov 1996

4.3.34 TM5-693, Uninterruptible Power Supply System Selection, Installation, and Maintenance for C4ISR Facility, 31 May 2002

4.3.35 UFC 3-520-01, Interior Electrical Systems, 10 Jun 2002

4.3.36 UFC 3-550-03FA, Electrical Power Supply and Distribution, 1 Mar 2005

4.3.37 UFC 3-560-01, Electrical Safety O & M, 31 Mar 2008

4.3.38 UFC 3-580-01, Telecommunication Building Cabling Systems Planning and Design, 22 Jun 2007

4.3.39 UFC 3-600-01, Fire Protection Engineering for Facilities, 26 Sep 2006

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4.3.40 CJCSI 6211.02C, Defense Information Systems Network

(DISN): Policy and Responsibilities, 9 Jul 08

4.3.41 CJCSI 6130.01D CJCS Master Positioning, Navagation and Timing Plan (MPNTP), 13 APR 2007

4.4 DEFENSE INFORMATION SYSTEM AGENCY

4.4.1 DISAC 310-55-9, Base Level Support for the Defense

Information Systems Network (DISN), 5 Nov 1999

4.4.2 DISAC 310-70-57, Methods and Procedures, Defense

Information System Network (DISN) Quality Assurance (QA) Program, 20 May 2009

4.4.3 DISA Instruction 240-110-33, Physical Security, 1 Feb 2007

4.5 DEPARTMENT OF ENERGY

4.5.1 DOE-HDBK-1092-04, DOE Handbook Electrical Safety, Dec 2004

4.5.2 DOE-SPEC-3019-96, Valve-Regulated Type Lead-Acid

Storage Batteries, Mar 1996

4.6 FEDERAL STANDARDS

4.6.1 FED-STD-368A, Quality Control System Requirements, 10 Dec

4.7 NATIONAL SECURITY AGENCY

4.7.1 NSTISSAM TEMPEST 2-95, RED/BLACK Installation Guidance, 12 Dec 1995

4.7.2 NSTISSAM TEMPEST/2-95A, Amendment to Advisory Memorandum TEMPEST 2-95 RED/BLACK Installation Guidance, 3 Feb 2000

4.7.3 NSTISSI-7003, Protective Distribution Systems (PDS), 13 Dec 1996

4.8 Insulated Cable Engineers Association (ICEA)

4.8.1 ICEA S-83-596, Optical Fiber Premise Distribution Cable, 12 Sep 2001

4.8.2 ICEA S-87-640, Optical Fiber Outside Plant Communication Cable, 1 Sep 2006

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4.8.3 J-STD-607-A-2002, Commercial Building Grounding

(Earthing) and Bonding Requirements for Telecommunications, 2002

4.8.4 ANSI/NECA-1-2006, Standard Practice of Good Workmanship in Electrical Contracting, 2006

4.8.5 ANSI-NECA/NEMA 105-2007, Standard for the Installing Metal Cable Tray Systems (ANSI), 2007

4.8.6 ANSI/NECA 111-2003, Standard for Installing Nonmetallic Raceways (RNC, ENT, LFNC) (ANSI), 2003

4.8.7 ANSI/NECA/BICSI 568-2006, Standard for Installing

Building Telecommunications Cabling (ANSI), 2006

4.9 AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

4.9.1 ASME Y14.100-2004, Engineering Drawing Practices, 2004

4.9.2 ASME Y14.24-1999, Types and Applications of Engineering Drawings, 1999

4.9.3 ASME Y14.34M-1996, Associated Lists, 1996

4.9.4 ASME Y14.35M-1997, Revision of Engineering Drawings and Associated Documents, 1997

4.10 INSTITUTE OF ELECTRICAL AND ELECTRONIC ENGINEERS

4.10.1 IEEE 100, Dictionary of Electrical and Electronics Terms,

4.10.2 IEEE 450, Recommended Practice for Maintenance, Testing and Replacement of Large Lead Storage Batteries for Generating Stations and Substations, 2002

4.10.3 IEEE 484, Recommended Practice for Installation Design and Installation of Large Lead Storage Batteries for Generating Stations and Substations, 2002

4.10.4 IEEE 485, Recommended Practice for Sizing Large Lead

Storage Batteries for Generating Stations and Substations, 1997

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4.10.5 IEEE 1187, Recommended Practice for Installation Design and Installation of Valve-Regulated, Lead-Acid Storage Batteries for Stationary Applications IEEE-519, 2002

4.10.6 IEEE 1188, Recommended Practice for Maintenance, Testing, and Replacement of Valve Regulated Lead-Acid Batteries for Stationary Applications, 1996

4.10.7 IEEE 1189, Guide for Selection of Valve Regulated Lead- Acid (VRLA) Batteries for Stationary Applications, 1996

4.11 NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

4.11.1 National Fire Protection Association, NFPA-1: Uniform

Fire Code [UFC], 2012

4.11.2 NFPA 70, National Electrical Code, 2011

4.11.3 NFPA 70E, Standard for Electrical Safety in the

Workplace, 2012

4.11.4 NFPA 70B, Recommended Practice for Electrical Equipment Maintenance, 2010

4.11.5 NFPA 75, Standard for the Protection of Information

Technology Equipment, 2009

4.11.6 NFPA 76, Standard for the Fire Protection of

Telecommunications Facilities, 2009

4.11.7 NFPA 77, Recommended Practices for Static Electricity,

4.11.8 NFPA 90A, Standard for the Installation of Air

Conditioning and Ventilation Systems, 2008

4.11.9 NFPA 101, Life Safety Code, 2009

4.11.10 NFPA 110, Standard for Emergency and Standby Power

Systems, 2005

4.11.11 NFPA 111, Standard on Stored Electrical Energy Emergency and Standby Power Systems, 2010

4.11.12 NFPA 220, Standard on Types of Building Construction, FOR OFFICIAL USE ONLY Page 11

4.11.13 NFPA 780, Lightning Protection, 2011

4.11.14 NFPA 5000, Building Construction and Safety Codes, 2007

4.12 Telecommunications Industry Association/Electronic

Industries Alliance (TIA/EIA)

4.12.1 TIA/EIA 455-50B, Light Launch Conditions for Long-length Graded Index Optical Fiber Spectral Attenuation Measurements,

4.12.2 TIA/EIA 455-59A, Measurements of Fiber Point

Discontinuity Using an Optical Time Domain Reflectometer (OTDR),

4.12.3 TIA/EIA 455-61A, Measurement of Fiber or Cable’s Length Using OTDR, 1991

4.12.4 TIA/EIA 526-7, Optical Power Loss Measurements of

Installed Singlemode Fiber Cable Plant, 1998

4.12.5 TIA/EIA 526-14-A, Optical Power Loss Measurements of

Installed Multimode Fiber Cable Plant, 1998

4.12.6 TIA-568-C.0-2009, Generic Telecommuncations Cabling for Customer Premises, Feb 2009

4.12.7 TIA-568-C.1-2009, Commercial Building Telecommunications Cabling Standards – Part 1, General Requirements, Feb 2009

4.12.8 TIA-568-C.2-2010, Balanced Twisted-Pair

Telecommunications Cabling and Components, Apr 2010

4.12.9 TIA-568-C.3-2008, Optical Fiber Cabling Components

Standard, Jun 2008

4.12.10 TIA-606-A-2008, Administration Standard for the

Commercial Telecommunications Infrastructure, 24 Nov 2008

4.12.11 TIA-569-B-2009, Commercial Building Standard for

Telecommunications Pathways and Spaces, May 2009

4.12.12 TIA-758-A-2004, Customer-Owned Outside Plant

Telecommunications Infrastructure Standard, 5 May 04

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4.12.13 TIA-942-2010, Telecommunications Infrastructure Standard for Data Centers, Mar 2010

4.13 Telcordia (Formerly Bellcore Standards)

4.13.1 Telcordia GR-63-CORE, NEBS Requirements: Physical

Protection, 3 Mar 2006

4.13.2 Telcordia GR-295-CORE, Mesh and Isolated Bonding

Networks: Definition and Application to Telephone Central Offices, 1 Nov 2004

4.13.3 Telcordia GR-499-CORE, Transport Systems Generic

Requirements (TSGR): Common Requirements, Issue 4,

4.13.4 Nov 2009

4.13.5 Telcordia GR-1089-CORE, Electromagnetic Compatibility and Electrical Safety – Generic Criteria for Network Telecommunications Equipment, Issue 5, Aug 2009

4.13.6 Telcordia GR-1275-CORE, Central Office/Network

Environment Installation/Removal Generic Requirements, Issue 8, Dec 2011

4.13.7 Telcordia GR-1502-CORE, Central Office/Network

Environment Detail Engineering Generic Requirements, Issue 5, Dec 2006

4.13.8 Telcordia GR-2930-CORE, Network Equipment Building System (NEBS): Raised Floor Generic Requirements for Network and Data Centers, Issue 1, Nov 1996

4.13.9 Telcordia GR-2981-CORE, Quality Program Analysis (QPA) for Telecommunications Engineering or Installations Service Providers, Issue 2, Oct 2005

4.13.10 Telcordia GR-3028, Thermal Management in

Telecommunications Central Offices: Thermal, Issue 1, Dec 2001

4.13.11 Telcordia GR-3160 NEBS Requirements for

Telecommunications Data Center Equipment and Spaces, Issue 1, Nov 2008

4.14 Other References

FOR OFFICIAL USE ONLY Page 13

4.14.1 NEMA VE 2-2006, Cable Tray Installation Guidelines, 31 Oct 2006

4.14.2 NEMA VE 1-2009, Metal Cable Tray Systems, 8 Oct 2009

4.14.3 NEMA 250-2008, Enclosures for Electrical Equipment (1000 V Maximum), 11 Mar 2009

4.14.4 American Society of Heating, Refrigeration and Air

Conditioning Engineers (ASHRAE) 90431, Thermal Guidelines for Data Processing Environments, 2nd Edition, 2009

4.14.5 ASHRAE 90429, Structural and Vibration Guidelines for

Datacom Equipment Centers, 2007

4.14.6 All Applicable Equipment Installation Manuals or

equivalent

4.14.7 DISA Cabeling Reference website:

http://www.disaconus.disa.mil/DISNEngineering/DISNEngineering.html

Return to:

Top of document

Table of Contents Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Appendix A Appendix B Appendix C Appendix D

FOR OFFICIAL USE ONLY Page 14 http://www.disaconus.disa.mil/DISNEngineering/DISNEngineering.html

TABLE OF CONTENTS

BASIC INSTALLATION REQUIREMENTS

1. Purpose

2. Applicability

3. Authority

4. References

C1. CHAPTER 1. WORKING CONDITIONS

C1.1 General Requirements C1.2 Cable Mining C1.3 Hazardous Materials/Waste

C2. CHAPTER 2. IRONWORK

C2.1 General Requirements C2.2 Cable Ladder Racks C2.3 Conduits C2.4 2-Post Equipment Racks and 4-Post Equipment Cabinets C2.5 Auxiliary Framing C2.6 Cable Racks and Trays C2.7 Frames, Bays and Cabinets C2.8 Slotted Channel C2.9 Conduit, Raceway, or Duct

C3. CHAPTER 3. FIRESTOPPING

C3.1 General Requirements C3.2 Firestops C3.3 Plenum Cable

C4. CHAPTER 4. SIGNAL CABLING AND WIRE

C4.1 General Requirements C4.2 Multiconductor Cable Terminations C4.3 Light Guide (Fiber Optic) Cabling C4.4 Optical Loss Testing C4.5 Nylon Cable Ties (Tie-Wraps), Wax Lacing, and Velcro

Straps

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C5. CHAPTER 5. CONNECTORS

C5.1 General Requirements C5.2 Soldering Connections C5.3 Coaxial Connections C5.4 Sheild Connections C5.5 Quick Connections C5.6 Wire Wrapping C5.7 RJ-45 Connections C5.8 BNC Connections C5.9 D SUB plugs, contacts connectors and housings (db-xx) C5.10 Compression Connections General -(#10 AWG 5.3mm2 and

Smaller) C5.11 Solderless Wrapped Connections C5.12 Optical Fiber Connectors

C6. CHAPTER 6. Equipment Designations, Labeling and Drawings

C6.1 General Requirements C6.2 Character Colors C6.3 Equipment and Frame Labeling Requirements C6.4 Rack and Cabinet Labeling Requirements C6.5 Fiber Optic Cable Labeling Requiremen C6.6 DS-X-Cat-X Labeling C6.7 AC Power (110VAC equipment power strip in rack/cabinet, etc… to receptacle to AC breaker panel) C6.8 Equipment Rack/Cabinet with AC power C6.9 DC Power Cable Labeling Requirements C6.10 DC Power Distribution Bay (DC Rectifier) to Fuse Alarm

Panel (FAP) C6.11 DC Rectifier and Fuse Alarm Panel (FAP) information cards/covers labeling C6.12 Relay Rack/Cabinet Labeling C6.13 Timing Labeling C6.14 Marked Drawing Requirements (REDLINES) C6.15 Parameters for Drawing Changes – Additions C6.16 Parameters for Drawing Changes – Removals C6.17 Parameters for Drawing Changes – Changes C6.18 Floor Plan Drawing C6.19 Cable, Cable Rack & Auxiliary Frame Plan Drawing C6.20 Relay Rack Front Equipment Drawin

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C7. CHAPTER 7. AC AND DC POWER

C7.1 General Requirements C7.2 DC Power Connectors and Connections C7.3 Bus Bars C7.4 Batteries and UPS C7.5 Fuses and Circuit Breakers

C8. CHAPTER 8. GROUNDING REQUIREMENTS

C8.1 General Requirements C8.2 Earth Electrode System C8.3 Lightning Protection System C8.4 Fault Protection System C8.5 Signal Ground Reference C8.6 Routing, Supporting and Securing Grounding Conductors C8.7 Termination of Ground Conductor C8.8 Grounding Conductor Identification

C9. CHAPTER 9. WAVEGUIDE, RIDGE COAX, SEMI-RIDGE & COAX

GROUNDING

C9.1 General Requirements

C10. CHAPTER 10. DOCUMENTATION

C10.1 General Requirements

AA. Appendix A. DISN SITE POWER CHECKLIST

AB. Appendix B. DISN SITE SURVEY CHECKLIST

AC. Appendix C. DISN INSTALLATION QUICK REFERENCE CHECKLIST

AD. Appendix D. DISN IMPLEMENTATION COMPLETION REPORT

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FIGURES

C2.7.1 Grounding Bus Bar Terminal C2.7.2 Order of Bolt for Grounding Strap to Bus Bar C2.7.3 Order of Bolt Connection for Grounding Cable To Bus

Bar C2.7.4 Bonding to a Flexible Cable or Conduit C2.7.5 Bonding to a Ridge Conduit or Pipe C4.1.1 Wireway Use in Shielding Power Line Radiated Emissions C5.7.1 Left – CAT-5, Right – CAT-6 C5.7.2 CAT-6 cable with inner sheath C5.7.3 Proper sheath inside RJ45 connector C5.9.1 Sheath Removed C5.9.2 Wires Separated C5.9.3 Wires Stripped C5.9.4 Connector pins properly crimped C5.9.5 Wires inserted into db connector C5.9.6 Connector Pins Properly Seated C5.9.7 Wires Managed in Connector C5.9.8 Completed in Cover C5.9.9 Male Connector C5.9.10 Female Connector C6.4.1 FDP Labeling Example C6.4.2 Equipment in Shelf C6.5.8.1 FDP label facing fiber connections when door is closed C6.5.8.2 FDP CCSD label facing out when door is closed C6.5.8.3 Fiber Optic Labeling Examples C6.6.1 DS3/CAT-X Labeling Examples C6.6.2 Correctly labeled Sycamore SN9K DS3 cables C6.7.1 AC Power Strip to AC Breaker Panel C6.7.2 Equipment to AC Power Strip via an AC Receptacle C6.10.1 Fuse Alarm Panel Labeling Examples C6.11.1 FAP Information Card C8.3.1 Transmission Line at Entry Plate C8.4.1 Voltage of a NEMA-15 Outlet

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TABLES

C1.3.1 Potentially Hazardous Materials C2.6.52 Cable Rack Clearance C2.7.1 Maximum Length of Ground Cables C2.7.2 Minimum Torque Requirements for Bolted Bonds C2.7.3 Vertical Alignment of Framework C4.1.1 Separation Between Twisted-pair and Shielded Power

Cables C4.4.1 Fiber Optic Cable Attenuation Coefficient C5.10.1 Terminal Color Code Versus Wire Gauge C7.1.1 Vertical Alignment of Power Racks and Bays C7.1.2 Separation between Twisted–Pair and Shielded Power

Cables C7.3.1 Maximum Length of Equipment Chassis Ground Cable C8.5.1 Maximum Length of Ground Cable and Bus Bar C8.6.1 Recommended Ground Cable Size per Application C10.1.1 Color Code for Blue Prints and Engineering Drawings

Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Appendix A Appendix B

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C1 WORKING CONDITIONS, CABLE MINING AND HAZARDOUS

MATERIAL/WASTE

C1.1 General Requirements

C1.1.1 The Defense Information Systems Network (DISN) facility in which the installation is to occur, shall limit all communication concerning the implementation to DISA NS6. The implementations vendor shall be responsible for establishing a quality assurance (QA) process. The duties of the implementation vendor’s QA inspector is to periodically inspect and evaluate the quality of the ongoing installation and enforce the implementation of the standards of this document.

Sufficeint Recommendations for a successful QA/QC program may be found in paragraphs C4.3.20 – C4.3.23. QC inspection shall be conducted, at time of commissioning, to ensure 90% compliance but must ensure no hazerdous conditions exisit. QC duties may be performed by the lead FE or independent team as deemed appropriate by the implementation program manager.

C1.1.2 All equipment is to be protected against any material falling onto or entering into the interior of the equipment during the installation.

C1.1.3 The cutting, drilling, or filing of metallic material in rooms housing operational DOD communication/computer electrical or electronic equipment is prohibited unless absolutely Mission Essential and other equipment is placed in HAZCON.

C1.1.4 Close all cable penetrations opened for the installation and/or removal of cabling temporarily at the end of each day during continuing work operations.

C1.1.5 Opened cable penetrations require adequate protection for personnel and equipment where there is any danger of material falling to the floor below.

C1.1.6 The Installation Teams are to maintain a clean environment. At the end of each shift, they are to clean the work area, clear walkways of debris or installation materials, and remove any trash from the facilities.

C1.1.7 At the end of their shifts, the installers are to store their tools neatly in a secure area. Installers’ tools are their responsibility to maintain and track. DISA or any other government agency is not responsible for tools or materials that are lost or stolen.

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C1.1.8 The Installation Team is to protect existing equipment and cable from damage during all work activities.

C1.1.9 The tool used to crimp lugs is to have a ratchet mechanism that requires a full crimp before the tool can be removed from the connector. Only the correct size and type crimp die is to be used.

C1.1.10 Wire wraps shall be made using the proper tool sized to the wire gauge.

C1.1.11 A hoist is to be used to lift battery cells, equipment chassis or modules into place when total weight exceeds the “two-man carry” requirement.

C1.1.12 When working under a raised floor, the area where floor tiles have been removed is to be cordoned off to prohibit the movement of all personnel not assigned to the installation team.

Stringers supporting floor tiles are not to be removed at any time without prior approval from an O&M Site Representative.

C1.1.13 After the installation or de-installation is completed, the site is to be cleaned and swept, all old cables, boxes and miscellaneous scrap removed, tie-wrap scraps removed from floor, and tools or scrap removed from the overhead auxiliary framing or cable rack.

1.2 CABLE MINING

C1.2.1 A detailed Method of Procedure (MOP) shall be prepared and approved before starting a cable removing or mining operation. A detailed Telecommunications Services Implementation Plan (TSIP), with cautionary instructions for the field engineers, will suffice if the level of detail is sufficient to accomplish the assigned tasks.

C1.2.2 The leads associated with de-powered/defused AC circuits shall be removed from their assigned terminals at both ends and the wire mined or their wire ends insulated using wire nuts, electrical tape, or an approved boot.

C1.2.3 Equipment designations and capacity stamping, associated with removed AC circuits, shall be removed.

C1.2.4 Circuit identification cards inside of AC service cabinets shall be updated to reflect circuits removed or added.

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C1.2.5 Raceway(s) remaining in the removal area shall be run and supported as specified by the NEC and in the job documentation, be securely fastened, and all unterminated ends closed.

C1.2.6 Raceway and raceway supports associated with removed equipment shall be removed from its served point (far end) back to the distribution point, unless otherwise specified in the job documentation.

C1.2.7 Open but unused knockouts in AC service cabinets, raceway junction boxes, etc., remaining in the removal area shall be closed.

C1.2.8 Raceway junction boxes and fittings remaining in the removal area shall be equipped with covers.

C1.2.9 Any AC wire nut connections remaining in the removal area shall be reconnected in an enclosed location, such as a raceway junction box.

C1.2.10 When loosening cable or wire for removal (cutting securing stitches or removing cable clips), the Installation Team shall exercise caution and utilize the appropriate tools to ensure that adjacent cables, which may be live, are not damaged or cut.

C1.2.11 The Installation Team shall remove wires/cables as far back as the job documentation specifies.

C1.2.12 All applicable service interruption and/or degradation prevention and equipment protection precautions shall be adhered to during cable removal and mining operations.

C1.2.13 All applicable safety precautions shall be adhered to during cable removal and mining operations.

C1.2.14 Sharp objects shall not be used to separate cable bundles.

C1.2.15 Wedges, lifting, or separating tools shall be non-metallic and non-conductive.

C1.2.16 When cable is being removed from cable rack, either horizontal or vertical, the Installation Team shall verify that

FOR OFFICIAL USE ONLY Page 22 the cable rack is fastened to the building surface or a supporting structure before the stitching is removed.

C1.2.17 During the mining operation, if it is observed that the ironwork, auxiliary framing or cable rack is becoming distorted, coming loose from its connecting hardware or displays un-anticipated movement, the Installation Team shall immediately stop the work activity and notify the DISN Facility representative.

C1.2.18 The Installation Team shall be equipped with adequate on site supplies to restore service interruptions caused by cable mining operations.

C1.2.19 Under no circumstances shall a loop of cable or wire be inserted through the protective ring of a cable cutting tool to be cut.

C1.2.20 All cables to be cut during a cable removal or mining operation shall have their ends hanging off the cable rack and all cuts shall be made a minimum of 18 inches below or to the side of the cable rack.

C1.2.21 If there is a possibility of the cut portion of a cable striking working equipment when it is cut, the cable cutting activity shall be performed on the floor, or the appropriate equipment protection shall be installed to ensure that the cut cable ends do not strike working equipment.

C1.2.22 To avoid the possibility of cutting loops of live cables hanging off cable racks, the potentially live cables shall be temporarily separated away from the cables to be cut. When possible, the cables shall be separated on the cable rack. If, due to the amount of cable on the cable rack, the cables cannot be separated on the cable rack, then the cables shall be temporarily supported with trunk straps (or equivalent) to the side of the cable rack away from the cable cutting activity.

C1.2.23 If the job documentation or engineering specification does not specify the extent to which cables are to be removed from equipment frames or bays that are being removed, the Installation Team shall detail in the MOP the point on the horizontal cable rack where the cable will be cut.

C1.2.24 If the job documentation does not specify the extent to which cables are to be removed or mined from vertical cable

FOR OFFICIAL USE ONLY Page 23 racks, the Installation Team shall detail in the MOP where the cable will be cut, the cable hole(s) and the floor(s) where the cable removal or mining activity is being performed.

C1.2.25 When removing cable on vertical runs of more than one floor, the stitching securing the cable shall not be removed for more than one floor at a time.

C1.2.26 On vertical cable runs, cable(s) shall be cut from the floor above a cable hole allowing the free end to be identified before passing it through to the floor below.

C1.2.27 All unused lengths of cord and cable clips associated with removed cables and remaining in the removal or mining area shall be removed from the cable racks.

C1.2.28 The Installation Team shall remove, relocate, or add all end guards, end shields, framework details, units/equipment, equipment frames, equipment bays, cable and wire terminations, terminal blocks, etc., as specified in the job documentation.

C1.2.29 All far end connections associated with removed units or equipment frames shall be removed.

C1.3 HAZARDOUS MATERIAL/WASTE

C1.3.1 The DISN Facility shall adhere to the guidelines and procedures in their respective Hazardous Material/Waste Management documentation, and comply with federal, state, local, and provincial regulations.

C1.3.2 The DISN Facility shall be responsible for identification and removal of hazardous waste prior to the equipment being removed and scrapped.

C1.3.3 All hazardous waste shall be packaged per federal, state, local, and provincial regulations.

C1.3.4 The DISN Facility shall be responsible for removal and transportation of the packaged hazardous waste from the site.

C1.3.5 The Installation Team must contact the DISN Facility representative if the Installation Team becomes aware or suspects that hazardous material exists in the equipment being scrapped.

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C1.3.6 If the Installation Team uncovers hazardous material during the cable mining job (e.g., lead cable, arsenic cable, PCBs etc.) the work in that area shall be stopped immediately.

The DISN Facility representative shall be contacted for disposition, and no work in that area shall continue until the DISN Facility has a resolution for the hazardous material identified

Potentially Hazardous Materials

Potentially Hazardous Material Central Office Source

Lead Batteries, Lead Sheathed Cable Arsenic Vintage Cloth-Jacketed Cable Acids Batteries Cadmium Batteries Mercury Switches, Relays, Tubes Radium-Bromide Vacuum Tubes Krypton Vacuum Tubes Polychlorinated Biphenyls Capacitors, Fluorescent Light, Ballast, Transformers Solvents and Cleaners Storage Cabinets Asbestos Cesium tubes PolyVinyl Chloride-PVC and cabling Brominated Flame-retardants-printed circuit boards, cabling and connectors

Power Plants, Exhaust Stacks, Diesels, Heating and Plumbing Duct Work, Sprayed-on Fireproofing Line Card Resistors, Floor Tiles, and Building Materials

Asbestos can be present in a wide variety of building materials including, but not limited to, plaster, wall board, construction adhesives, surfacing materials, ceiling and floor tile, shingles, etc. Disturbance of such materials may be subject to federal, state, local, and provincial regulations.

Table C1.3.1

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Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Appendix A Appendix B

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C2. CHAPTER 2. IRONWORK, RACK and CABINET INSTALLATION

C2.1 General Requirements

C2.1.1 This section covers the general requirements for the location, assembly and erection of cable and relay racks.

C2.1.2 The Implementation Team shall ensure, as part of the evaluation of the installation, that all work has been done in accordance with implementation documentation or approved changes.

C2.1.3 The location of auxiliary framing, cable racks, frames, relay racks and other equipment shall conform to the site drawings and specifications for each installation. Approved deviations shall be marked on the drawings.

C2.1.4 All ironwork installation described in this section shall conform to the seismic requirements for zone 4,except where otherwise noted.

C2.1.5 All fastening details, piece parts and other apparatus used in the assembly and installation of auxiliary framing, ladder racking, racks and cabinets shall be in accordance with manufacturer’s specifications.

C2.1.6 Cut ends of auxiliary framing, cable racks, bolts, etc., shall have sharp or jagged edges removed. Cut ends and damaged painted surfaces shall be repainted.

C2.1.7 Auxiliary framing shall be uniform in length, at the correct height and properly located.

C2.1.8 Splices shall be the through bolt type.

C2.1.9 The end of the auxiliary framing should extend at least 3 inches beyond the last point of support.

C2.1.10 All exposed ends of auxiliary framing shall be equipped with a rubber finishing caps.

C2.1.11 When short sections of auxiliary framing are used below the regular framing, rubber finishing caps shall be installed on the exposed ends.

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C2.1.12 There shall be a minimum 5-inch clearance between the ends of auxiliary framing and any building surface or apparatus (e.g., HVAC ducting). Any building surface or apparatus shall be installed with a minimum 5-inch clearance to the auxiliary framing.

C2.1.13 Auxiliary framing shall be supported at approximately five feet intervals, not to exceed six feet and shall not extend more than 30 inches beyond the last support. The support shall be: From the ceiling using 5/8 inch threaded rods or from the floor using 2 inch pipe stanchions or wall supports using batten boards or Directly supported by rack/cabinet or other approved methods.

C2.1.14 Pipe stanchion floor flange shall be fastened to the floor with a minimum of two 1/4-20 flat head machine screws and associated floor anchors.

C2.1.15 Auxiliary framing should be installed in 6-foot sections unless otherwise specified.

C2.1.16 Unsupported ends of auxiliary framing, supporting cable rack, ladder track, conduit, etc., shall not extend past the last point of support more than 2 feet 6 inches.

C2.1.17 When a square tube floor stanchion system is used, it shall be installed in accordance with instructions given in the detailed specifications.

C2.1.18 Stiffening clips shall be installed on no more than 2-foot centers between auxiliary framing supports.

C2.1.19 Stiffening clips may be omitted at locations where an earthquake brace, cable rack, or other clipped fastening of 1/2 inch or larger is located.

C2.1.20 Cable racks supported directly by auxiliary framing shall be attached with J-bolts or C-Clip kits at each support.

C2.1.21 Auxiliary framing supported conduit shall not be extended to wall-mounted switches, lights, outlets, etc.

Approved flexible conduit or cable shall be utilized for this application.

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C2.2 Cable Ladder Racks

C2.2.1 Where cable ladder racks are directly attached to auxiliary framing, both stringers shall be bolted to the framing at each end of a run. At intermediate points, only one J-bolt is required at each auxiliary framing intersection. The J-bolts shall be staggered so that adjacent fastenings along the rack can be made on opposite sides of the rack. When short pairs of auxiliary framing are used to support the cable ladder rack extending beyond regular framing, or are used for the support of a frame, two J-bolts or spanner clips shall be used per auxiliary frame support.

C2.2.2 Cable ladder racks shall be located as specified on job drawings.

C2.2.3 Space between ends of cable ladder rack stringer shall not exceed 5/8 inch at splices.

C2.2.4 Only one cable ladder rack splice is permitted between any pair of supports and spliced sections are not permitted to extend beyond the last support.

C2.2.5 Cable ladder rack shall be supported at approximately 5 feet intervals, not to exceed 6 feet and shall not extend more than 30 inches beyond the last support.

C2.2.6 There shall be a minimum 5-inch clearance between the ends of the cable rack and any building obstruction.

C2.2.7 Where required, cable ladder rack pans shall be installed using the following guidelines: Pan shall be installed on all upper tier ladder rack systems to prevent cable sag. All junctions shall be overlapped a minimum of 3 inches. The bottom section of “pan” shall not extend more than three inches past the common cross member. Pan shall not extend past the end of the cable rack stringer or closing detail. Cable retaining horns on “panned” cable rack shall be installed on both sides of the cable rack on 18-24 inch centers. An overlapping arrangement of pans should be utilized to avoid cutting of pans.

C2.2.8 Distance between cable ladder rack cross members shall not exceed 9 inches. Additional support shall be provided as necessary to keep the cable from sagging.

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C2.2.9 The ends of cable ladder rack sections shall be protected with rubber finishing caps or end closing bar.

C2.2.10 Cable ladder racks shall not be supported by their cross members.

C2.2.11 Vertical racks on walls or columns shall be supported at the floor and shall have intermediate support with a maximum spacing not to exceed 5 feet.

C2.2.12 For horizontal cable runs, the cable ladder rack shall be placed with the cross members upward. A cable rack with solid bar-type stringers, smaller than 25 inches in width, may be inverted to gain necessary cabling heights due to fixed obstructions. Cable ladder racks with reinforced straps shall not be inverted.

C2.2.13 All cable ladder sections shall be bonded together with a #6 stranded cable at every splice point. Only one bonding cable shall be required per splice section pair.

C2.2.14 Implementation Team shall follow proper bonding procedures defined in the Grounding and Bonding section of this document.

C2.3 Conduits

C2.3.1 Conduit shall be supported with material designed for the support of conduit, such as U-bolts, conduit clamps, conduit straps, etc. Hose clamps, cord, tie wraps and other similar material shall not be used to support conduit.

C2.3.2 Rigid conduit and Electrical Metallic Tubing (EMT) shall be secured on a wall or ceiling every 10 feet and shall be supported within 3 feet of each outlet box, junction box, or cabinet. An outlet junction box or cabinet that is secured is considered a support. The use of EMT is permitted in applications where the EMT shall not be subject to physical damage.

C2.3.3 Liquidtight flexible metal conduit shall be secured and fastened to a support within 12 inches on each side of each outlet box, junction box, cabinet or fitting. No support is required when Liquidtight flexible metal conduit is installed inside the base angle of frameworks. Three feet of unsupported Liquidtight flexible metal conduit from a fitting is acceptable

FOR OFFICIAL USE ONLY Page 30 when flexibility of the equipment is necessary or when the Liquidtight flexible metal conduit serves lighting fixtures.

Cord/tie wrap may be used to hold Liquidtight metal conduit in place within a frame (not for support).

C2.3.4 Liquidtight flexible metal conduit shall not be used as a main fixed raceway for power conductors, except where flexibility of the raceway is required.

C2.3.5 The total combined length of all Liquidtight flexible metal conduits from source to load shall be limited to 6 feet.

C2.3.6 Conduit serving a junction box that does not contain a device and does not support fixtures shall be supported within 36 inches of the box, on two or more sides. If a junction box contains a device, conduit shall be supported within 18 inches of the box.

C2.3.7 Conduits secured to other than a wall or ceiling shall be securely fastened at intervals of approximately 5 feet, not to exceed 6 feet maximum. Conduit shall not extend more than 30 inches beyond the last support.

C2.3.8 Unused knockouts in boxes and cabinets and all un-terminated conduit ends shall be closed.

C2.3.9 Conduit shall be placed so as not to block future cabling, ladders and equipment.

C2.3.10 Proper clearance from pipes, duct work or heat generating equipment shall be maintained to eliminate possible damage to cable.

C2.3.11 Conduit shall be supported with material designed for support of conduit, such as conduit clamps, conduit straps, etc.

Nylon cable ties, lacing cord or similar material shall not be used.

C2.3.12 Insulated couplings shall not be installed in AC conduit or raceways.

C2.3.13 Conduit fittings shall be tight.

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C2.4 2-Post Equipment Racks and 4-Post Equipment Cabinets

C2.4.1 All 2-post equipment racks 7'-0" and taller shall be top supported by attachment to the site infrastructure, if existing site conditions allow. If a series of 2-post equipment racks (Equipment Bay Group) are tied together, infrastructure supports are required at each end of the group and one at the middle of the group. EBG’s that exceed 20 feet must have infrastructure support every 8-10 feet. An equipment bay group or group of bays is defined as any number of individual equipment racks that are rigidly bolted or otherwise through-bolted together to form a structurally continuous unit of racks.

C2.4.2 All 2-post racks shall be secured to the installation site “true floor” with minimum size 5/8” hardware at each corner, unless mounting a rack/cabinet to true floor through a raised floor using raised floor stanchions. In these cases 1/2" hardware shall be used to anchor stanchions to true floor and 5/8” hardware to secure racks/cabinets to stanchions. True floor is not the raised floor installed at many locations, but the floor that the raised floor is mounted to.

C2.4.3 All 2 & 4-post bays 7'-0" or taller installed as an individual unit, not junctioned to any adjacent frames, shall have at least two points of support to the overhead superstructure.

C2.4.4 All 2 & 4-post units 7-0” or taller shall be secured with 4 floor anchors. Top support should be utilized, unless specified in the detail specification.

C2.4.5 All 2 & 4-post uprights of adjacent racks and cabinets shall be joined together per manufacturer’s specifications and at the top and bottom to form a continuous lineup.

C2.4.6 All 2 & 4-post racks and cabinets to be installed shall be measured from reference points as identified on the floor plan.

C2.4.7 All 2 & 4-post Bays and cabinets shall be plumb and aligned to adjacent bays and cabinets to within ¼ inch.

C2.4.8 All 2 & 4-post Bays and cabinets shall be level within 1/16 inch per foot. If shims are required, there shall be no more than a 1-inch shim stack.

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C2.4.9 If an embedded obstruction (e.g., reinforcing bar) is encountered during floor drilling, drill another hole at an alternate location. If relocating the hole is not possible, contact the PMO and Site POC.

C2.4.10 Where ever possible, 2 & 4-post Racks, cabinets, etc.

shall be bolted to the true floor using approved floor anchors, stanchions, etc.

C2.4.11 End guards and guardrail closings are required on all bay uprights at each end of the lineup.

C2.4.12 End panels shall be placed on exposed cabinet uprights not located adjacent to another cabinet.

C2.4.13 Hinged doors or covers on cabinets shall not bind with adjacent covers or doors to such an extent that any cover or door cannot be readily opened without causing the adjacent cover or door to move. In addition, hinged doors shall not come in contact with any working equipment.

C2.4.14 All 2 & 4-post Equipment racks or cabinets shall never be left unsupported. When equipment frames or cabinets are temporarily placed at a location, before being permanently secured, they shall be strapped to at least two locations (i.e.

auxiliary framing, building column).

C2.4.15 The following rack /cabinet clearances shall be maintained.

• Front – minimum 36”

• Rear – minimum 36”

• Sides/ends – minimum 24”

C2.4.16 All 2 & 4-post racks and cabinets shall be individually grounded to the equipment ground plane or ground bus. Racks and cabinets shall never be “daisy chained” to each other. All exceptions to this policy shall be addressed through the Release and Deployment Lead on a case by case basis.

C2.4.17 Threaded Rods, bolts, nuts and screws used to secure parts or units shall be tight. The appropriate size bolt, rod, washer, nut, etc shall be used in all cases.

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C2.4.18 Chrome rack screws shall not be used under any circumstance to mount/secure equipment.

C2.4.19 The short chrome screws that come with ADC fiber management are acceptable to secure fiber management to equipment 2-post racks.

C2.4.20 Stainless Steel bolts, nuts and washers shall be the preferred hardware to use when making DC power connections in rectifiers or in grounding scenarios where this type of hardware is required.

C2.4.21 Implementation team shall cut the exposed end of a bolt or rod that extends into the equipment or wiring area, or presents a personnel hazard.