Earthing of panels





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  1. #1
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    Default Earthing of panels

    Is it required to earth panels to a copper spike in the ground like for solar fences?

    It was mentioned in a post that the earthing is where most installers fall short, but never what should be done.

  2. #2
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    Default Re: Earthing of panels

    Quote Originally Posted by NewLandy View Post
    Is it required to earth panels to a copper spike in the ground like for solar fences?

    It was mentioned in a post that the earthing is where most installers fall short, but never what should be done.
    Copied from SANS 10142 Solar.

    SANS 10142 clearly state that the earth spike should have a resistance reading of less than 10 Ohm. You will not get that reading with one earth spike only. In most cases you need to install an earth matt or multiple earth spikes.

    Annexure B: Lightning Protection on Photovoltaic Systems


    (Normative where lightning protection is required or installed – See Section 5.3.6, Lightning Protection)
    Lightning Protection System (LPS)
    The installation of a lightning earth-termination system and suitable down conductors with equipotential bonding is a compulsory requirement.
    If the equipotential bonding conductors are considered as down conductors, the minimum cross section of the down conductors shall be 50mm2 copper or equivalent (IEC 62305-3, Table 6).
    If the equipotential bonding conductors are intended to carry partial lightning currents, the minimum cross section of the down conductors shall be 16mm2 copper or equivalent.
    The minimum cross section of the bonding conductor connecting internal metallic installations to the bonding bar shall be 6mm2 copper or equivalent (IEC 62305-3, Table 9).
    If the equipotential bonding conductors are intended to carry only induced lightning currents, the minimum cross section of the down conductors shall be 6mm2 copper or equivalent.
    The minimum cross section of the bonding conductor that connects different bonding bars, and that connects the bars to the earth termination system, shall be 16mm2 copper or equivalent in the case of PV installations not connected to the LPS (IEC 62305-3, Table 8).
    Where the risk of a strike to the PV installation exceeds the requirements calculated via SANS 62305-2, an LPS that is insulated from the PV-DC is required. If the risk is not calculated, it must be applied to all PV installations exceeding 13.8kVA.
    NOTE: The installation size of 13.8kVA is derived from the estimated PV array installation size of 130m2 that will be exposed to lightning activity. It also corresponds to small scale embedded generator categories.
    The following table presents risk factors for design considerations.
    Table B-1: General Specifications of PV Systems and the Necessity for an LPS [Ahmada, M.Z.A. Ab-Kadira, M. Izadia, N. Azisa, M.A.M. Radzib, N.H. Zainia, M.S.M. Nasira]
    SSEG Sub-Categories
    Specifications
    Necessity of Lightning Protection System
    Category A1
    0 kVA ≤ x ≤ 13.8 kVA
    To protect buildings and prevent any physical damage to the buildings, as well as life hazards from lightning strikes.
    Category A2
    13.8 kVA < x < 100 kVA
    Can increase the return of investment of the PV system.
    Category A3
    100 kVA ≤ x < 1 MVA
    To reduce the cost of repairing damages by installing a LPS.
    The following table summarises the external and internal LPSs according to the different types of PV
    Last edited by grips; 2019/11/20 at 09:43 AM.
    It is not what you buy its what you build.

  3. #3
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    Default Re: Earthing of panels

    Thank you.....

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