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.



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