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RF Shielding Specifications


These RF shielding specifications are written specifically for construction projects for use by architects, builders, and construction professionals.  They are available in word format for further editing as necessary. All three types of National Shielding RF shielding specifications are available for free download on this website.



1.1          DESCRIPTION

The purpose of RF shield construction is to create an enclosure in which radio frequency (RF)

and/or electromagnetic interference (EMI) is contained and/or prevented from entering. 


1.2          WORK INCLUDED

This section includes furnishing all labor, materials, equipment, tools, and related items to engineer, pre-fabricate, deliver, install and test an RF shielded enclosure.


1.3          WORK NOT INCLUDED

The following work is excluded, but shall be coordinated with the shielding vendor:

  1. Construction or preparation of the parent structure to receive the shield assembly.

  2. Weatherproofing and climate control of the parent structure prior to the installation of the shield assembly.

  3. Connections of other work to the RF shielded enclosure.

  4. Delivery and installation of the equipment to be installed in the EMI shielded room.

  5. Any final finishes including but not limited to HVAC ducting, electrical wiring, drywall, paint, VCT, etc.


1.4          REFERENCES

 A.           Comply with applicable requirements of the following standards and those others referenced in this Section.

  1. American Welding Society

    1. AWS D1.1, Structural Welding Code - Steel

  2. Military Standard

    1. MIL-STD-220A, Method of Insertion Loss for Radio Frequency Filters.

    2. MIL-STD-285, Method of Attenuation Measurements for Electromagnetic

  3. Shielding Enclosures for Electronic Test Purposes.

  4. Underwriters Laboratories Inc.

    1. UL-1283, Standard for Safety - Electromagnetic Interference Filters.

  5. American Standard for Testing and Materials

    1. ASTM F1869, Standard Test Method for Measuring Moisture Vapor Emission



A.  ATTENUATION: The shield must meet the following performance criteria according to specifications supplied by the owner:

  1. Attenuation of magnetic field.

  2. Attenuation of electric field.

  3. Attenuation of plane wave.

  4. Attenuation of sound.


B.  GROUND: The shield structure must be electrically grounded at a single point, with a minimum resistance to alternate ground of 1,000 ohms.



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