Extra Precautions

When applying for the net-metering, the distributed generation facility has to fulfil the following requirements according to NEPRA’s regulations

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  1. PV mountings and other metallic structure must be grounded using properly sized, good quality cable. The earth connection must also be tested for its continuity and resistance value to see that the grounding is adequate. The preferred ohm value is less than 5 ohms (for small scale home hold system).
  2. PV modules mountings arrangement should be sturdy, long lasting, galvanized steel or aluminum channels.
  3. The mountings should be properly secured with a strong base to ensure that they can withstand windstorms and other climatic changes.
  4. PV modules should be attached to the mountings by stainless steel nuts and bolts using SS spring washers.
  5. PV module cables should not be cut and twisted together for any kind of interconnection.
  6. For paralleling of PV strings, adequately sized combiner box or other similar accessories should be used.
  7. All cables should be properly secured using properly sized ties, not tied with metal wire or ordinary string.
  8. Current carrying cable from PV modules to inverter should be DC cable of proper rating, should have separate colors to identify positive/ negative, and should be in UPVC conduit, not normal PVC conduit.
  9. AC circuit breakers should not be used for DC circuits.
  10. All terminations should be done using properly sized terminals. These terminals should have insulation sleeves and be attached to cables by proper crimping tools.
  11. The AC input /output of inverters should be properly protected by proper amperage circuit breakers.
  12. If batteries are to be used, it is necessary that battery leads and terminations should be done using properly size terminals.