6 Measurement the resistance protective conductors
Verification consists measurement the resistance between any exposed conductive
part and the nearest point the main equipotential bonding.
The measured resistance shall meet the following condition:
R≤50/Ia
where
50 means 50V, which the prospective touch voltage under normal conditions,
Ia the current (in causing the automatic operation the protective device within
5s.c.VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION 87
9., and with minimum current 0.3.
It recommended that the measurement carried out with supply having no-load
voltage d.c. a.
Note: Protective conductors include metal conduits and other metal enclosures for conductors defined
conditions.2 A.
