Safety Recommendations

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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Apart from mandatory requirements for the processing of net-metering, further safety steps have to be considered for the protection of inverters, solar panels, DC wiring, and mounting frames.

A minimum of two separate dedicated and interconnected earth electrodes must be used for the earthing of the solar PV system support structure with a total earth resistance not exceeding 5 ohms as below:

  1. Equipment earth (DC)
  2. System earth (AC)

Lightning (surge) arrestors are designed to absorb voltage spikes caused by electrical storms and effectively allow the surge to bypass power wiring and your equipment. The applicant has to make sure that the distributed generation facility is separately grounded and the lightning arrestors are provided.

  1. Fuses and circuit breakers are primarily used to protect the PV system wiring from getting too hot and catching fire. They are also used for protection of appliances from electricity. It is also very important to properly size your cables and wires to prevent excessive heat /fire.
  2. Wire gauge scale is given in the DC wiring section of Chapter 3, which should be considered while installing solar system. Moreover, circuit breakers should also be installed according to the rating of the panels and inverters