Okay, this is a common and important question regarding electrical safety. Let's break it down and make sure we understand the NEC (National Electrical Code) principles involved.

The Correct Approach (NEC Perspective)

Your initial understanding is correct: the neutral and ground should be bonded only at the first point of disconnect (the service disconnect). This ensures a single, intentional ground point.

Your Scenario: Meter Disconnect with Grounded Neutral, No Ground to Service Panel

This is a common, and often problematic, situation in older installations, or sometimes the result of improper modifications. Here's how to address it, keeping in mind I am an AI and not a licensed electrician, and local codes always prevail:1. You MUST establish a grounding electrode system at the house/service panel. Because you do not have a grounding conductor (equipment grounding conductor) running from the meter/disconnect to the service panel, you must treat the service panel as the first point of disconnect for the grounding system. This means bonding the neutral bar to the panel enclosure and connecting that to a grounding electrode system.2. Grounding Electrode System

This typically involves:

Ground Rods

Two ground rods, driven at least 8 feet into the earth and separated by at least 6 feet (NEC 250.53(B)).

Ufer Ground (Concrete-Encased Electrode)

If present, a Ufer ground is superior to ground rods. This is a bare copper conductor at least 20 feet long and at least 1/2 inch in diameter, encased in at least 2 inches of concrete that is in direct contact with the earth (NEC 250.52(A)(3)).

Metal Water Pipe

If a metal water pipe is in direct contact with the earth for at least 10 feet, it can be used as a grounding electrode, but it must be supplemented by another electrode (ground rod or Ufer) (NEC 250.52(A)(1)). Important: Be aware of local codes about water pipe grounding. Some jurisdictions don't allow it at all.3.

Bonding the Panel



Bonding Jumper

In the service panel, you must install a bonding jumper (typically a green or bare copper wire) between the neutral bus bar and the metal enclosure of the panel. This bonds the neutral to the metal case. This is only done at the service panel.4.

Grounding Electrode Conductor (GEC)

The grounding electrode conductor (GEC) is the wire that connects the service panel's grounded neutral bus to the grounding electrode system (ground rods, Ufer, etc.). The size of the GEC is determined by the size of the service entrance conductors (the wires coming into the panel). Refer to NEC Table 250.66 to determine the proper size. This conductor must be continuous (no splices) unless specifically permitted by the NEC.

Why is this Necessary? Safety

Without a proper grounding system at the service panel, a fault (short circuit) could energize the metal parts of appliances and the electrical system without tripping a breaker. This creates a severe shock hazard.

Fault Current Path

The grounding system provides a low-impedance path back to the source (the transformer) for fault current. This low-impedance path allows the breaker to trip quickly, disconnecting the circuit and preventing dangerous voltage from appearing on metal enclosures.

Voltage Stabilization

Grounding helps stabilize the voltage to ground, reducing the likelihood of voltage spikes and transients that can damage sensitive electronics.

Important Considerations



Local Codes

Always consult your local electrical codes and regulations. They may have specific requirements that differ from the NEC. Local codes ALWAYS prevail.



Permits

In many jurisdictions, you will need to obtain an electrical permit for this type of work. This ensures that the installation is inspected and meets code requirements.

Qualified Electrician

I strongly recommend hiring a licensed and qualified electrician to perform this work. Electrical work can be dangerous, and it's essential to ensure that it's done safely and correctly. They can properly assess the existing conditions, perform the necessary upgrades, and ensure that the installation meets all applicable codes.

Upgrading the Service

In some cases, especially in older homes, it may be necessary to upgrade the entire service to current standards, which would include running a properly sized ground wire from the meter disconnect to the service panel. This is often the best long-term solution.

In summary, yes, you must install a grounding electrode system at the service panel and bond the neutral to the panel enclosure if there is no equipment grounding conductor running between the meter disconnect and the service panel. However, the details of the installation must comply with the NEC and local codes, and a qualified electrician should be involved. Flag for review