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125/148 REF C04717-02-91 Q-NRG User Manual, Edition 4.2
Appendix COSMED srl
Protective Earth resistance
Earth bond Testing, also referred to as Ground bond Testing, tests the integrity of the low resistance connection
between the earth conductor and any metal conductive parts, which may become live in case of a fault on Class I
medical devices. Although many Class I medical devices are supplied with an earth reference point, most if not all
medical devices require multiple earth bond tests to validate the connections of additional metal accessible parts
on the enclosure.
The test current is applied between the earth pin of the mains supply plug and any accessible metal part (including
Potential Equalization Node) via a dedicated earth bond test lead (clip/probe).
[Measurement of protective earth resistance in ME equipment with detachable power cord]
A Potential Equalization Node
Test Protective earth resistance
Classification Class I with detachable power cord
Accessible conductive parts which may become live in
case of a fault
Potential Equalization Node
Acceptance criteria <300mOhm (including power cord)