For all protective conductors, including main and supplementary bonding conductors, electricians must perform a continuity test using a low-reading ohmmeter. For main equipotential bonding, there is no single fixed value of resistance above which the conductor would be deemed unsuitable.
Earth bond testing verifies the integrity (continuity) of the protective bonding of the equipment designed to secure safety through the basic insulation and protective earthing. It is also called the earth (ground) bonding test. With earth bond testing, a current in the range of 5 mA to 100 A is applied for 60 seconds to a few minutes. The resistance is measured by measuring the voltage. The test current is determined by the rating of the distribution system.
If the continuity of the protective bonding is confirmed, it can be concluded that the equipment has the requirements for preventing electric shock even if the insulation between the primary circuit and the accessible conductive section fails and a fault current flows through the distribution system.
Instruments from RMO-E Series are ideal for testing protective bonding (grounding) of equipment following IEC 61010-1 standard. In these instruments two test modes are available, Single and Contin. As a result of that, a user can easily check the protective bonding/grounding of the equipment.