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NS ORD-1996-033 Zoning Ordinance Text Amendments - Telecommunication Towers
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NS ORD-1996-033 Zoning Ordinance Text Amendments - Telecommunication Towers
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Last modified
8/11/2015 4:19:39 PM
Creation date
10/31/2013 9:37:06 AM
Metadata
Fields
Template:
BOCC
Date
9/3/1996
Meeting Type
Regular Meeting
Document Type
Ordinance
Agenda Item
VIII-G
Document Relationships
Agenda - 09-03-1996 - VIII-G
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\Board of County Commissioners\BOCC Agendas\1990's\1996\Agenda - 09-03-1996
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JULES COHEN & ASSOCIATES, P.C. 39 <br /> CONSULTING ENGINEERS <br /> WASHINGTON, D.C. 20036 <br /> Engineering Statement Page 3 <br /> Carrboro, North Carolina <br /> where f is frequency in megahertz and S is power density in milliwatts per square centimeter <br /> (m W/cm=). Given this relationship, the most restrictive exposure guide level would occur at <br /> 869 MHz, the lowest possible operating frequency for cellular base stations. Applying this <br /> frequency to the formula yields a protection guide level of 2.9 mW/cm2. <br /> The revised standard, C95.1-1992, also specifies maximum exposure in terms of a <br /> frequency-dependent maximum level, but, instead of a protection guide, this level is referred to <br /> as a maximum permissible exposure (MPE) level. The new standard also categorizes exposure <br /> environments as controlled or uncontrolled. The 1982 standard did not distinguish between <br /> exposure environments. Under C95.1-1992, controlled environments are locations where there <br /> is exposure that may be incurred by persons who are aware of the potential for exposure as a <br /> concomitant of employment, by other cognizant persons, or as the incidental result of transient <br /> passage through area where analysis shows the exposure levels may be above the MPEs for <br /> uncontrolled environments but less than the MPEs for controlled environments. The MPE for <br /> controlled environments under the 1992 standard for emissions in the 300 to 3000 MHz frequency <br /> range is the same as the 1982 protection guide level and therefore may be calculated using the <br /> formula given above. The averaging time for controlled environment exposures is also 0.1 hour <br /> as with the 1982 standard. Thus, in this case, the MPE for controlled environments would be the <br /> same as the protection guide level, 2.9 mW/cm2. The base of the KNKA293 tower, which is <br /> enclosed by a fake, is an example of a controlled environment. Locations inside the KN A293 <br /> equipment shelter also are examples of a controlled environment. <br />
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