Hi I am installing an off grid solar system form my orchard and shed. Basically there are some pumps, lightning and some household appliances like refrigerator etc.
I have read many articles about grounding/earthing, I know what is EGC and GEC are but I cannot figure out the proper way of grounding my equipment.
I have attached a very crude drawing (sorry for my paint skills). From what I understand I have to connect all bare metal parts together with a copper conductor and connect that to Neutral Line (this is EGC). Also I have to connect the neutral to the earth through an electrode (this is GEC).
It puzzles me since if a lightning strikes to the metal frame of the pv array, all the EGC since all metal parts of all appliances plus the neutral line will be momentarily raised to the voltage of the lightning strike ?
Also if a lightning strikes to a conducting cable like the cable going to the motor the SPD will close and again the EGC voltage will be raised to lightning potential ?
If someone could point out the following questions I will be grateful.
1)There are 8 grounding points in the drawing. Which of them should be bond together ? 2) How many grounding rods I need ? 3) Where should I connect the Neutral Line to the Grounding Rod ?