equipotentialbondingiin

Equipotential bonding is the electrical practice of interconnecting exposed conductive parts and extraneous conductive parts so that they reach the same electrical potential. The aim is to prevent dangerous voltage differences between metalwork that a person might touch, especially during fault or abnormal conditions. Bonding is distinct from, but complementary to, protective earthing (grounding), which provides a low-impedance path for fault currents to the earth.

Main equipotential bonding conductors normally connect the building's earth electrode to metallic service pipes, structural steel, and other substantial metallic components. Supplementary bonding conductors tie together various metal items that could become live relative to each other, such as cold-water pipes, gas pipes, metal bathroom fittings, and electrical enclosures, ensuring no significant potential differences exist between them.

Standards for equipotential bonding vary by country but share common goals. They specify when bonding is required, how conductors are sized, how connections are made, and how to maintain continuity. Examples of national guidelines include the UK IET BS 7671 and its supplementary bonding requirements, the IEC 60364 series, and the NFPA 70 (National Electrical Code) in the United States. The exact ratings depend on circuit voltage, impedance, and the installation type.

Effects of equipotential bonding include reduced risk of electric shock and arcing between metallic parts. Proper installation requires qualified personnel, adherence to local codes, and regular inspection for corrosion or mechanical damage that could open bonds or increase impedance.

The nonstandard string equipotentialbondingiin may appear as a typographical variant of equipotential bonding in some sources.