Good morning! It sounds like you're on the right track, but let's clarify a few points to ensure your grounding is compliant and safe.Here's a breakdown of the situation and best practices, based on the NEC (National Electrical Code)

Understanding the Setup:
200A Service

Your service entrance is rated for 200 amps.

Exterior Disconnect

The inspector wants a disconnect switch located outside, after the meter.

4/0 SER Cable

You're running 4/0 SER cable from the disconnect to the panelboard inside.

Grounding at Panel

You installed 2 ground rods and a water meter jumper with 4 AWG to the

panelboard Grounding at Disconnect

You

did bond the disco.

Analysis of Grounding

Here's where things get a bit nuanced:1.

Bonding the Disconnect

Since the disconnect is the service equipment, it should be bonded according to NEC 250.24(A). This means that the enclosure should be bonded to the grounded (neutral) conductor.
2.

Grounding Electrode Conductor (GEC) Connection

The GEC (the conductor connecting your ground rods and water pipe bond)

must connect to the neutral at the service equipment.3. Neutral-Ground Bond: Since this is the service equipment, the neutral must be bonded to the enclosure in the disco.

What Should Have Been Done (Preferred and Code-Compliant)


Neutral-Ground Bond in Disconnect

The neutral conductor in the disconnect is where the system bonding jumper should be located to bond the disco enclosure.2.

Grounding Electrode Connection at Disconnect: The GEC (4 AWG to ground rods and water pipe bond) should be connected to the neutral bus in the disconnect.3. 4/0 SER to Panel: The 4/0 SER cable to the panelboard should not have the neutral bonded to the panel enclosure. It should be treated as a subpanel, so the only connection between the neutral and the enclosure should be at the service equipment (the disco).

Why This Matters



Safety

Proper bonding and grounding are crucial for clearing faults, minimizing voltage potential differences, and protecting people and equipment from electrical shock.

Code Compliance

Following the NEC ensures your installation meets safety standards and will pass inspection.

Voltage Drops/Harmonics

Improper grounding can contribute to voltage drops, harmonic issues, and potentially dangerous circulating currents.

Action Steps


Inspect the Disconnect

Ensure that the grounded (neutral) conductor is bonded to the enclosure of the disconnect.2.

Verify GEC Connection

Make sure the GEC (your 4 AWG to ground rods and water meter bond) connects to the neutral bus in the disco.3.

Verify No Bond at Panel

Disconnect the bonding screw or strap in the panelboard. The neutral and ground should be isolated except at the disco.

Important Considerations



Local Amendments

Always check with your local jurisdiction for any amendments to the NEC. Local codes can sometimes be stricter.

Consult a Qualified Electrician: If you're unsure about any of these steps, consult with a licensed and qualified electrician in your area. Electrical work can be dangerous, and proper installation is essential.By following these guidelines, you'll ensure a safe and code-compliant grounding system for your 200A service. Good luck! Flag for review