08 56 46.20 20.pdf

P-719 Wargaming Center eProject No. 1590908 Marine Corps Base, Quantico, VA Issued for Construction

SECTION 08 56 46.20 20

RADIO FREQUENCY SHIELDED ENCLOSURES

08/11

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL, INC. (AMCA)

AMCA 210 (2016) Laboratory Methods of Testing Fans for Aerodynamic Performance Rating

AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC)

AISC 325 (2017) Steel Construction Manual

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2020) Structural Welding Code - Steel

ASTM INTERNATIONAL (ASTM)

ASTM A568/A568M (2019a) Standard Specification for Steel, Sheet, Carbon, Structural, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements for

ASTM A1008/A1008M (2016) Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hardenable

ASTM B194 (2008) Standard Specification for Copper-Beryllium Alloy Plate, Sheet, Strip, and Rolled Bar

ASTM E90 (2009; R2016) Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements

ASTM F1066 (2004; R 2014; E 2014) Standard Specification for Vinyl Composition Floor Tile

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 299 (2006; R 2012) Standard Method for Measuring the Effectiveness of Electromagnetic Shielding Enclosures

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NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2019; TIA 19-1; TIA 19-2; TIA 19-3; TIA

19-4; ERTA 1 2019) National Electrical Code

U.S. DEPARTMENT OF DEFENSE (DOD)

MIL-PRF-15733 (2010; Rev J, Supp 1 2010; Notice 1 2015;

Notice 2 2020) Filters and Capacitors, Radio Frequency Interference, General Specification for

MIL-STD-220 (2009; Rev C; Notice 1 2014; Notice 2 2019) Method of Insertion Loss Measurement

MIL-STD-461 (2015; Rev G) Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment

1.2 GENERAL REQUIREMENTS

Provide enclosure complete with penetrations for water lines, and door assembly. Provide each item with fittings and hardware necessary for a complete and operable RF shielded enclosure. Where two or more units of the same type, class, and size of equipment are required, units shall be products of a single manufacturer. Completely isolate the enclosure electrically from the building in which the enclosure is to be installed.

1.2.1 Mechanical Work

Provide complete shielded enclosureas indicated on drawings.

1.2.2 Electrical Work

Conform to the requirements of the NFPA 70 , National Electrical Code.

Provide complete shielded enclosure as indicated on drawings.

1.2.3 Scope of Work

Perform all work necessary as required for the construction of the project as indicated on the Drawings. Such work included but is not limited to the following:

1. Provide shielding materials for exterior walls and interior partitions only. Floors and ceilings are not included unless noted otherwise.

2. RF electrical filters as required with a grounding stud for room lighting and power and miscellaneous requirements except for those supplied by the customer.

3. Penetrations for utility line penetrations (chilled water, condensate drain, compressed air, etc.).

4. Waveguides with extension collars for HVAC duct penetrations.

5. RF sealed mounting lag bolts for mounting of the equipment inside the enclosure.

6. Coordination of associated work by other building trades.

7. Testing to show compliance with the specified performance. The Owner reserves the right to delete the testing from this section, in which case it will be provided by the Owner and a credit will be issued by the shielding contractor.

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1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submittals with an "S" are for inclusion in the Sustainability eNotebook, in conformance to Section 01 33 29 SUSTAINABILITY REPORTING.

Submit the following in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SD-02 Shop Drawings

Radio frequency shielded membrane

Show layout of protected areas. Indicate RF components. Show components and installation conditions not fully dimensioned or detailed in product data.

1. Show ducts, pipes, conduit, and other objects that penetrate RF protection; include details of penetrations. 2. Show details of RF shielded doors and frames, including anchorage to and coordination with other work. Show locations of electrical conduit and boxes for connecting door operators, door operator switches, and door interlock switches.

a. Wiring Diagrams: For power, signal, and control wiring.

SD-03 Product Data

Telephone and signal line filters

Shielded air vents

Door assemblies

System Descriptions: List the products and materials to be used and how they are to be installed, including type and number of layers of conductive tape.

SD-06 Test Reports

Door static load test

Door sag test

Swinging door closure test

Attenuation testing

SD-07 Certificates

Performance test plan

Qualifications of shielding enclosure testing agency

Qualifications of installation supervision personnel

Components of shielded enclosure individually and as a system, meet specified attenuation requirements.

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SD-10 Operation and Maintenance Data

Radio Frequencey shielded doors, to include in operation and maintenance manuals.

1.4 PERFORMANCE REQUIREMENTS

A. Provide materials and workmanship, including joints and fasteners, that maintain continuity of RF protection at all points and in all directions equivalent to materials specified in thicknesses and locations indicated.

B. Shielding systems shall have an attenuation rating as follows:

Minimum 35 dB of attenuation from 30 MHz - 10 GHz

C. Glazing film shall have an attenuation rating as follows: Minimum 40 dB of attenuation from 30 MHz - 6 GHz

1.5 QUALITY ASSURANCE

A. Installer Qualifications: Company specializing in RF shielding, with minimum of three years experience.

B. Source Limitations: Obtain each type of RF protection product from single source from single manufacturer.

C. Shielded construction shall have flamed spread classification (FSC) of 0, fuel contribution of 15, smoke density of 30. Corresponding NFPA interior finish classifications to be Class A, UBC Class I, when tested in accordance with ASTM method E84-70.

D. The completed architectural RF shielding enclosure shall comply with the RF performance and quality control requirements for NSA 94-106.

E. Electrical components, devices, and accessories: listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

F. Preinstallation conference: conduct conference at project site.

Review methods and procedures related to RF protection, including, but not limited to the following:

1. Sequence and schedule of RF protection work in relation to other work.

2. Supplementary RF shielding at duct, pipe, and conduit penetrations.

3. Methods of attaching other construction and equipment to RF finishes.

4. Notification procedures for work that requires modifying RF protection.

5. Requirements for field quality control.

1.6 DELIVERY, STORAGE AND HANDLING

A. Steel Doors and Frames: Comply wiht requirements in Division 08 Section "Hollow Metal Doors and Frames" for delivery, storage and handling.

B. RF Doors and Frames: Deliver doors and frames cardboard wrapped or

SECTION 08 56 46.20 20 Page 4 crated to provide protection during delivery and storage. Inspect for damage on delivery. Minor damage may be repaired provided the refinished repair matches new work and is approved by the Architect; otherwise, remove and replace damaged items as directed.

C. RF Membrane: Comply with manufacturer's written instructions and requirements.

1.7 PROJECT CONDITIONS

A. The Contractor shall review the work of the contract and its relationship with the new RF shielding and construction detailing. The Contractor shall notify the Government Project Manager in writing 15 days after NTP of any deficiencies.

B. Environmental Limitations: Do not deliver or install RF protection until spaces are enclosed and weathertight, when work in spaces is complete and dry, and temporary HVAC system is operating and maintaining ambient temperature and humidity conditions at occupancy levels during the remainder of the construction period.

C. Field Measurements: Verify actual dimensions of openings by field measurements before fabrication.

1.8 WARRANTY

A. The enclosure shall be quaranteed in writing by the manufacturer against defective materials and workmanship and to retain the specified shielding characteristics for the life of its intended use. Excluded from this warranty are the doors and the electrical filters which shall be quaranteed for a period of two (2) years.

PART 2 PRODUCTS

2.1 SHIELDED ENCLOSURE CHARACTERISTICS

2.1.1 Radio Frequency Interference Attenuation

As stated in 1.4 PERFORMANCE REQUIREMENTS.

2.2 RADIO FREQUENCY (RF) BARRIER

AISC 325 .

2.2.1 RF Membrane

Provide vapor-permeable radiant barrier foil system adhered to masonry walls and/or adhered in between layers of gypsum wallboard as shown in the project documents, with seams overlapping a minimum of 4 inches.

Conductive tape to be provided to form a continuous electrical connection at all door openings, and to connect to the metal structural deck at both the second floor level and second floor secure ceiling level.

Extend radiant barrier foil system on the first floor level concrete slab for 24 inches minimum around the perimeter of the space, ensuring a continuous connection with the radiant barrier foil membrane on the walls.

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2.3 DOOR ASSEMBLIES

The enclosure door shall be nonsagging and nonwarping and shall afford shielded effectiveness equal to the rest of the enclosure when the door is closed. Provide at least one row of RF finger stock around the shielded door or door frame. The fingers that form a contact between the door and door frame shall be protected from damage due to physical contact and shall be concealed within the door and frame assemblies. The door shall have a clear opening as indicated on drawings. Door assemblies shall be factory made. Doors shall be reinforced steel or laminated type.

Laminated type shall have the steel faces electrically and mechanically joined by channels or overlapping seams, both of which shall be continuously seam welded along joined surfaces. Where noted on the drawings, provide rotary cut, premium grade natural birch veneer to match non-shielded wood doors.

2.3.1 Finger Stock

ASTM B194, Condition HT. The finger stock shall be secured to the door or frame without using special tools or soldering or adhesives and shall have a minimum overlap of 2 inches.

2.3.2 Latching Type

Provide lever controller door with roller cam action requiring not more than 20 pounds of operating force on the handle for both opening and closing. The door shall be equipped with a three-point latching mechanism that provides proper compressive force for the RF seal. The mechanism shall be operable from both sides of the door and shall have permanently-lubricated ball bearings at points of pivot and rotation. The door latches and hinges shall be rated for a minimum of 10,000 cycles without loss of attenuation and without adjustments.

2.4 WINDOW ASSEMBLIES

Provide translucent radio-frequency shielding film on the inside face of glazing units located on the radio-frequency shielded boundary, as noted in the drawings. Performance to be as described in 1.4 PERFORMANCE

REQUIREMENTS.

2.5 NAMEPLATES

Major components of equipment shall have manufacturer's name, address, catalog number, model, style, and type on a plate securely and conspicuously attached to each item of equipment. Nameplates for electrical apparatus shall conform to NEMA standards.

PART 3 EXECUTION

3.1 SHIELDING STEEL INSTALLATION

Install in strict accordance with the shielding manufacturer's/fabricator's recommendations. Exercise care while handling and installing shielding steel to ensure against damage. Clean exposed surfaces of dirt, finger marks, and foreign matter resulting from manufacturing processes, handling, or installation. Inside the enclosure, mount items including boxes, conduits, fixtures, and switches directly to the structural steel members. Do not allow mounting bolts and screws to penetrate shielding steel. Locate electrical conduits as close to RF

SECTION 08 56 46.20 20 Page 6 shielding as possible. If materials and equipment penetrate the shielded enclosure, seam weld or solder materials and equipment to both surfaces or shielding steel. Where the steel sheet is much thinner than the penetrating member, provide a welded collar of intermediate thickness for transition to accomplish the welding.

3.1.1 Surface Preparation

Clean and prepare all surfaces to receive RF membrane as recommended by the membrane manufacturer surfaces to ensure firm contact and adhesion.

3.2 DOOR ASSEMBLIES

Mount so that the clearance between the door edges and frame shall not vary more than 1/16 inch and the innerface of the door periphery does not vary more than 1/16 inch from the plane of the door stop's face.

Through-bolt hinges to the door and the frame.

3.3 FIELD TESTS

3.3.1 Attenuation Testing

Final acceptance testing will be by the Government. Conduct the final shielding acceptance test after penetrations have been completed, specifically including electrical and other utility penetrations. In addition, the Contractor may schedule a complete or abbreviated test to verify that the shielding assembly is adequate prior to conducting final shielding acceptance test.

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