JC, One problem is how your local authority does things and how things may or may not have been different when your service was installed. That being said, here is what is proper around here today........
1. THE NEUTRAL IS BONDED TO THE GROUNDING ELECTRODE (driven rod or rods, buried metallic pipes etc) ONLYYYYYYYY AT ONE LOCATION, WHATS CONSIDERED THE SERVICE ENTRANCE. At the Service Entrance the groundING electrode conductor, often a bare No 4 copper wire, is bonded to the Neutral and it leads from there to the Grounding Electrode which may consisit of one or more driven copper ground rods and buried metallic pipes etc.
It appears your Service Entrance is out at the MAIN BREAKER. Therefore, THERE AND ONLY THERE is the Neutral (a groundED conductor) bonded to the groundING electrode (driven rods or water pipes etc) via the grounding electrode conductor (say a No 4 bare copper wire).
NOTE: If such is the case, at your house THE NEUTRAL IS NOTTTTTTTTTTT BONDED AGAIN. In the house panel (considered a sub panel NOT the Service Entrance) the Neutral Buss and the Safety Equipment Ground Buss ARE NOT TO BE BONDED TOGETHER as if they would be if there was no external main breaker but your house panel was the service entrance.
2. If out at the main breaker the Neutral (a groundED conductor) is bonded to the groundING electrode conductor (which leads to the grounding electrode) THEN YOU HAVE TO RUN FOUR (4) WIRES FROM THE MAIN BREAKER TO THE HOUSE......Namely 2 Hots (L1 & L2) a Neutral (groundED conductor) and the safety equipment groundING conductor.
3. Out at the Main (Service Entrance) the Neutral (a groundED conductor) and the GroundING electrode conductor (often a bare # 4 copper wire to ground rods and water pipes etc i.e. the GroundING electrode) are bonded together AND ONCE MORE DO NOTTTTTTTTTTTTTTTTTTT re bond the Neutral and Equipment Ground Busses together at the sub panel inside your house **********
Got it?????????? At the main breaker bond Neutral to Ground,,,,,,,,,,Run 4 wires to house (2 hots, Neutral, Equipment ground),,,,,,,At the house DO NOT bond the Neutral and ground Busses, i.e DO NOT bond Neutral to ground again
NOTICE I have no idea what your local authority does and how things may have been when your house was wired SO NO WARRANTY THIS IS CORRECT FOR YOU
Im ONLY telling you how its done around here in todays world
John T Long Retired Electrical Engineer and rusty on the latest NEC so NO WARRANTY
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