The main reason for proper grounding is safety for your employees and equipment.
All ground rods, including metal water pipes, should be connected at the point where a building’s ground connections come together. These ground rods can be combined at the service entrance to decrease ground resistance.
In the event of a lightning strike, separate ground connections could endanger personnel and equipment.
If multiple neutrals are tied to grounds throughout your system, this could cause protection circuits to malfunction.
The service entrance is the only place where a ground should be connected to a neutral.
Typical Connection Problems:
Problem: Burning odor at a circuit breaker panel, J-box or outlet
Problem: Warm CB panel
Problem: Buzzing sound
Problem: Scorched or charred insulation.
Problem: No voltage
Problem: Intermittent, inconsistent voltage