ITU-T K.66 PDF

This Recommendation:

– provides practices for installing protection at residential and commercial customers' premises;

– is intended to comply with [IEC 60364-5-54] or national standardizing bodies on a.c. power installations;

– is intended for use with new installations as well as for expansion and upgrading of existing installations;

– is intended to encourage planning for electromagnetic compatibility and safety, which should include bonding and earthing arrangements that accommodate installation tests and diagnostics;

– is not intended to replace national regulations on bonding configurations and earthing.

For telecommunication equipment resistibility requirements, see [ITU-T K.21]. Permissible levels of electromagnetic emissions are covered by [CISPR 22], or by national regulations. Concerning the need for overvoltage protectors, see [ITU-T K.11], [ITU-T K.39], [ITU-T K.46], [ITU-T K.47] and [IEC 62305-2]. Concerning the need for a lightning protection system (LPS), see [IEC 62305-2] and national regulations.

This Recommendation is intended for customers' buildings, including residential and commercial installations.

This Recommendation is not mandatory but intends to promote 'best practice' protection methods by operators and regulators.

Areas subject to a.c. earth potential rise (EPR), e.g., substations, may require additional protection measures. See "Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines", Volumes VII and VIII (ITU handbook).