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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : K.27
Title : Bonding configurations and earthing inside a
telecommunication building
Study Group : V - Protection against Electromagnetic Effects
Version : New
Date of adoption : 1991
Notes :
The main subject of the CCITT Handbook on "Earthing of
telecommunication installations", comprises the potential rise of a
telecommunication building and the reduction of the associated voltage
drop by combined use of intentional and incidental earth electrodes.
However, the transition from analogue to complex digital
telecommunication systems has indicated inadequacies with earthing
techniques of the past and has therefore caused renewed interest in
bonding and earthing techniques and their impact on electromagnetic
compatibility (EMC). Consequently, there is a need for a CCITT
Recommendation on bonding configurations and earthing inside a
telecommunication building.
Since the publication of the Earthing Handbook in 1976, several
different bonding and earthing configurations have been introduced,
and it is desirable to promote standardization by defining generic
versions of these configurations. Although there are differences among
the configurations, there are many important common aspects. These are
discussed in Recommendation K.27. In addition, three example
configurations are described.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).