This Recommendation covers bonding configurations and earthing for equipment located at remote electronic sites such as switching or transmission huts, cabinets or controlled environmental vaults with only one level, a need for a.c. mains power service, and a floor space of about 100 m2 without an antenna tower on the roof of the building as well as nearby; but are more substantial than small electronic housings, such as carrier repeaters or distribution terminals. Experience in the operation of Electronic Equipment Enclosures shows that the use of a bonding configuration and earthing that are coordinated with equipment capability and with electrical protection devices has the following attributes: promotes personnel safety and reduces fire hazards; enables signalling with earth return (functional earthing); minimizes service interruptions and equipment damage caused by lightning, exposures to power lines and faults in internal d.c. power supplies; minimizes radiated and conducted emissions and susceptibility; improves system tolerance to discharge of electrostatic energy.