IEEE 1654:2009 pdf free download – IEEE Guide for RF Protection of Personnel Working in the Vicinity of Wireless Communications Antennas Attached to Electric Power Line Structures
4.Application
This guide presents a reference source for electric utilities on how to establish a safety program to meetOSHA and FCC RF exposure compliance requirements and protect clectrical workers in the vicinity ofwireless communication antennas adjacent or attached to electric power line structures. The informationthat the guide provides is geared more specifically towards the electrical workers that perform maintenanceor construction work on electric power lines or structures with attached active wireless communicationsantennas. It would be of less interest to other utility workers, such as communications workers. The guidedeals with the RF protection aspect only to the extent of meeting the already established RF compliancerequirements. Thesc OSHA and FCC requirements also encompass the health and safety issues, in additionto the RF exposure limits.Main contributions of this guide include that it describes for electric utilities theminimum requirements for establishing a RF safety program, and specific guidelines on the immunity ofRFPM to the power-frequency ficlds from transmission lines, as well as the use of conductive clothing forworker protection.
5.RF exposure—FCC and OSHA guidelines and requirements
The rules regarding human RF exposures enacted by the FCC establish regulatory requirements for FCC-licensed radio services，including human exposure limits more stringent than those of OSHA, and morerigorous compliance requirements for transmitter facilities. The FCC states that compliance with RFexposure regulations is the responsibility of the transmitter licensee.Private and commercial mobile radioservice(CMRS) providers and operators were required to have their transmitter facilities in compliancewith the revised FCC exposure guidelines by no later than September 1, 2000 , if major modifications weremade or a license was renewed.These federal government regulations have the greatest impact on easilyaccessible high-powered transmitter and antenna systems,such as broadcast systems.Implications forelectric utilities are mostly limited because the majority of the utilities’communications equipment isclevated on telecommunications towers，although some may be located on buildings or other utilitystructures. The power levels of the utilities’transmitters are also relatively low in comparison to the powerlevels of broadcast transmitters. However, in recent years, especially with the advent of deregulation, it hasbecome a common practice to lease space on utilities’transmission and telccommunications structures toexternal parties who provide personal communication services (PCS), cellular and sometimes PCS mobilephone services.As a result, there are now more locations where electric utility employees,particularlyelectric transmission workers，may be exposed to RF energy in their work environment.
7.RF emittersTypical measurements
Cellular and PCS phone service providers are prime users of HV transmission line towers because of thelarge number and locations of these towers across wireless service areas. Wireless systems have powerlevels that vary with the number of active channels employed (i.e., the number of phone conversationsgoing through each base station) and the “reach” of each particular base station. In rural areas, it is commonto have higher signal levels transmitted to cover a larger area than would be done in a more congested,urban environment. The antennas employed to transmit these RF signals have directional radiation patternsin the elevation plane, and do not radiate the signal directly in a downward (other than a few degrees ofmechanical or electrical down-tilt) direction. In addition, these cellular and PCS service frequencies followthe inverse square-law rule,which attenuates signal strength. This dissipation supports unencumberedaccess to areas around the base of these towers.