This is a common question...
712.542.102 Separate earth electrode
If a separate earth electrode is provided for the PV array, this electrode shall be connected to
the main earthing terminal of the electrical installation by main equipotential bonding
conductors.
This clears up the questions about where to install the earth wire.
PV array bonding conductors shall be run as close to the positive and negative PV array and
or sub-array conductors as possible to reduce induced voltages due to lightning. See also
712.521.103.
Taking about insulation resistance, take note.
712.531.3.101.1 Array insulation resistance detection
The requirements in 712.531.3.101.1 regarding detection and response to abnormal array
insulation resistance to earth are intended to reduce hazards due to degradation of insulation.
A means shall be provided to measure the insulation resistance from the PV array to earth
before starting operation and at least once every 24 h. This can be done by an insulation
measuring device according to IEC 61557-2, or by an insulation monitoring device (IMD)
according to Annex C of IEC 61557-8:2014, to prevent a possible high risk of fire.
Posting Permissions
Reply With Quote
Did you like this article? Share it with your favourite social network.