Earth grounding to protect from lighting to ground strikes and outside forces is called electrode grounding system.It should connect to the grounding bus in panel.Also the equipment ground to panel(panel bonding)to protect people from being a conductor,and water line bonding should all be one system Neutral and equipment ground conductors should only occur in the main service panel.Bonding connectors between water supply pipes have been installed with the electric service grounding electrode.
The equipment grounding system at the service panel is often the most important connection in the building.The equipment grounding conductors must connect to the grounding bus at the service panel.These connection must be made and are usually referred to as the "main bonding jumper(Bus tie bar).
1.) Two important grounding needed.Electrode grounding system,and the equipment grounding system.Bonding load center and all metal line such as water,gas must all bond together according to sections 250-50 of the national electrical code.
2.) The NEC requires that the metal water piping not be the only elecrode ground section(250-50a2).
ELECTRICAL CODE COMPLIANCE: these inspection procedures are designed to assist in the detection and reporting of electrical service defects which can be recognized by visual inspection. This inspection is for the purpose of determining compliance with local electrical codes.
I have came across numerous improper grounding in many older homes.Only using the service entry ultility grounding.This doesn't protect the home for high voltage surge or strayed current Over the years home owners adds home additions, or replace water heaters, heating & air units add ceiling fans, etc....I would recommend having a inspector come behind the repairs being made to have work check to assure code compliance. Thhis could save you money down the road, as well as may increase you safety which is PRICELESS.
